Materials Engineering - Science topic

Hi

I keep getting the following error message when I run any Abaqus job:

There are no .lck files to be deleted and everyone else using our academic license seems to be unaffected. Occasionally, I can run a model through writing an input file and running through command prompt. Although even this doesnt work everytime, when I check the dat file I get the following error message:

Any help would be greatly appreciated as my work is getting delayed a bit and I have no idea what to do!

Kind Regards

Alex

I have tried this: mixed the powder with acetone before putting it into the pressing die of diameter = 13 mm. Added the damp powder into the die and pressed at 8 T and then waited for 30 minutes. I released the press in one step and took out the sample. The pellet is cracking. It has a circular crack like it is about to divide the pellet into two layers of powder but the crack is not continuous right round the pellet (it is only affecting half part of the pellet). The pellet is therefore forming sort of two layers, one big layer with almost half of it not affected and the other piece as a flake. 

Is there anything I can do to get a single solid pellet?

ICMEAAE 2024 provides an enabling platform for Materials Engineering and Applied Mechanics experts to exchange new ideas and present research results. This conference also promotes the establishment of business or research relations among global partners for future collaboration. We hope that this conference could make a significant contribution to the update of knowledge about this latest scientific field.

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The topics of interest include, but are not limited to:

1. Materials

- Materials Science and Engineering

- Nanomaterials

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2. Applied Mechanics

- Vibration Science

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All accepted full papers will be published in the conference proceedings and will be submitted to EI Compendex / Scopus for indexing.

Full Paper Submission Date: February 23, 2024

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Final Paper Submission Date: March 8, 2024

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As we are using alkali activated slag for injection, we need it with flowability for about 10 minutes. Usually these materials are known to set quickly. I am asking if there is any type of retarder working on AAS ?

Dear Researchers,

Let’s share and discuss the best books that you have enjoyed recently in the field of Materials science and engineering.

Please let us know your opinion about this topic.

Best Regards,

Hossein Homayoun

Dear ResearchGate ,

I hope this message finds you well. I am currently engaged in research that requires fine mesh size of Titanium powder, and I am seeking guidance regarding its procurement.

Could anyone kindly suggest reputable sources or suppliers from whom I could acquire fine mesh size powder? My specific requirements pertain to titanium fine powder ( mesh size - 325) .

Any insights, recommendations, or past experiences in obtaining similar materials would be greatly appreciated.

Thank you in advance for your assistance.

Best regards,

Mr. Ajit payer

IIT Patna

Metallurgical and Materials Engineering Department

I studied the properties of W-Cu alloys using molecular dynamics simulation,well I didn't find the eam potential of W-Cu alloy, How can I get or fit the potential for my simulation work ?Thank for your answer

Given data: Viscosity of the oil at 40 degrees is 416 cSt and viscosity of the oil at 100 degrees is 32 degree.

1-The conditions of the relationship between the pigment (Pyocyanin) with Gold (Au Nanoparticles)?

2-Dose the pigment (Pyocyanin) work as Reducing agent or not?

3-Dose the pigment (Pyocyanin) endures high temperatures or not?

So in a simple way, the path to create a tile/ceramic (with conventional ceramic processing / solid state reactions) is as follows:

1-Mixing powder

2-Calcining

3-Pressing

4-Sintering

In my case (manganese zinc ferrite) the temperature for both Calcining and Sintering process are relatively the same. I wanted to know if it is possible to exempt the process from Calcining step, and only rely on Sintering process to both (1) Synthesis the crystalline structure, and (2) From the ceramic?

The energy crisis of 2022, the climate crisis determined by the accelerating global warming process and the increasingly emerging smog in cities are the main determinants for the development of sustainable, zero-energy and zero-emission green building. In the perspective of a few decades, practically every investment that significantly improves the issue of energy efficiency and zero-emission should be included in the implementation of the green building transformation process. The basis for this kind of thesis, which plays a key role in climate, energy and environmental policy, is the pursuit of sustainable development goals, the reduction of greenhouse gas emissions, combating the ongoing process of global warming, limiting the scale of biodiversity decline and other environmental policy objectives. Besides, among the important objectives for the implementation of the green transformation of the economy, including the green transformation of the building industry, is the reduction of consumption, i.e. the scale of fossil fuel combustion, and the conversion of energy sources supplying heat and electricity to buildings from sources based on dirty combustion energy to renewable and emission-free energy sources. In this way, the development of sustainable green buildings with a high level of energy savings, low energy consumption and low or zero carbon emissions could be one of several key factors not only in the context of building a green, sustainable, zero-carbon closed loop economy, but also in terms of energy independence and a high level of energy security, which could be important in the future if further energy crises were to reoccur. In addition to this, an additional positive effect of the green transformation carried out in the construction industry will also be an improvement in air quality. In the European Union, the building industry, including unsustainable, energy-intensive construction, generates 40 per cent of energy consumption and is responsible for 36 per cent of greenhouse gas emissions. The European Union is therefore planning to accelerate the process of the ongoing green transformation of the economy, including the green transformation of the construction industry. One important element of the green transformation of the building industry is the thermal modernisation of existing buildings, which makes it possible to reduce energy consumption, including fossil fuels, by at least half. Existing, in-service buildings should be energy retrofitted by insulating them, modernising building facades by adding additional layers of materials to prevent heat loss from buildings, and equipping them with new renewable and carbon-free energy sources. On the other hand, newly constructed residential, office, industrial and other facilities should be built using new green building technologies and eco-innovations in materials, energy and others so that they are characterised by a high level of energy efficiency and zero-carbon. In view of the above, over the next few years all buildings in the European Union are to be significantly improved in terms of thermal energy consumption and zero carbon buildings should be achieved as soon as possible.

In view of the above, I address the following question to the esteemed community of scientists and researchers:

What do you think about it?

What is your opinion on this subject?

Please respond,

I invite you all to discuss,

Thank you very much,

Warm regards,

Dariusz Prokopowicz

ODF and Pole figure of Al 7075 after CGP process?ODF and Pole figure of Al 7075 after CGP process???

I am etching 400nm of Ti on top of <100> Si in the presence of Au and Ni.

Details can be seen in the attached file

I am looking for an effective way by using legal free software (like ImageJ).

effect of mechanical stirring on the microsturcture of AZ91 alloy

Hello all,

I'm trying to understand how we can combine the Forward Flux sampling method with LAMMPS to obtain ice nucleation rates using mW potential of water?

I do not understand if this is performed through LAMMPS itself or through a separate application and if so how is it applied in practice.

This method has been described in many publications but how FFS is used and which software is deployed for it is never clearly explained - maybe because it is directly understood but I cannot figure it out !

Any insight is appreciated. Thanks.

In order to examine the micro-structure in cross-section of the Inconel alloy on Cast iron, I'm not able to find a suitable etchant which could give good image. There are various etchants for both the material, and not finding a common etchant. 

Fe with 10-12%Al forms alpha solid solution. but Al does not dissolve any Fe Why ?

Dear friends..

I am in the field of medical sciences, and I know that; for example, Pubmed is among the most reputable indices to search papers in the medical field.

I am asking you according to your specialization to give examples of the most reputable indices in the fields of:

Agriculture

Materials

Engineering

Environment

Space and astronomy

Geology

Thank you in advance..

I am using mixing models to calculate effective parameters (such as permittivity or permeability) of mixtures, i.e. inclusions with a given volume fraction in a host medium. There are several mixing formulas that can provide values of the effective parameter of the mixture, such as Maxwell-Garnett or Bruggeman.

Explanations can be found here :http://en.wikipedia.org/wiki/Effective_medium_approximations

Bruggeman's model treats the host medium and the inclusion similarly, and it can handle any number of different inclusions. But, there is a limitation due to the mathematical formulation.

Suppose the simple case of only one inclusion in a host medium, the equation used to find the effective parameter of the mixture is a second order polynomial. If the discriminant is negative (which sometimes happens) then the solution is complex. But this may be non physical depending on the application case (conductivity calculation, permittivity is neither the inclusion nor the host have losses, etc) where we know that a real value is requested.

For a higher number of inclusions, this may happen more often.

So, what is the solution in this case ? How to use Buggeman's model to get a real value for the effective parameter in the case the equation's solutions are complex ?

Hi

I have a problem where I am trying to vary the stiffness spatially across a structured interface. The whole idea is to vary the stiffness vertically, with a bulk stiffness of 8GPa decreasing smoothly over 100 micrometres to 2GPa. To achieve this I have been using the USDFLD subroutine in Abaqus to create a functionally graded material. The base Fortran code Ive started with is attached as txt file.

To vary the stiffness I have created a field variable to relate Young's modulus to the y-coordinate system which would be really easy to get the desired result if it was just one part (as shown in the contour plot). The main issue I have with varying stiffness when both parts are present in the assembly is the area where these intersect each other vertically  prevents my current code from working. Im very new to using subroutines, I think it should be fairly easy to create a code to enable the stiffness to vary for both identical parts.

The code I have works for one part, so would it be possible to take the functionally graded component and export it as a part and then assemble and add boundary conditions from there?

Any help would be greatly appreciated!

Alex

What characterization required for automotive anti-roll bar applications?

Mechanical, Dynamic mechanical, thermal etc and what is range of vales of these properties

Dear Researchers :

I have this question and I have an hypothesis:

Why Natural HDPE, when extruded at temperatures about 100 °C (around) it has a white (but pale white), and then when the polymer cools down it color turns between white an yellow.

I understand that this phenomenon it is a general case of all LLDPE, LDPE and HDPE , and in all fabrication processes : Extrusion, injection, molding, pressing, etc.

So this is fundamentally, a chemical characteristic of the material ...

It has to do with a change in the Oxygen concentration in the material ?

Thank you all in advance,

Best Regards !

I am in the research and development phase of (integrated doctorate) thesis. My thesis is about Reinforcement of elements exposed to high heat ( I can share the summary information about the project work with the relevant professors who might be interested). 

We have done most of the project work, I will carry out my researches and develop the project in Pisa university with a supervisor for one academic year. 

looking for a supervisor support in Materials Engineering, Geotechnical Engineering, Chemical Engineering or similar related professors who might be interested in Reinforcement of elements.

Please kindly support/guide me to find the correct contact.

My contact information is as follows. Thank you,

+90 538 780 0818

[email protected] ([email protected])

Skype: rishadazizi

Why is there a maximum limit on the percentage of main reinforcement in RC columns, while in all cases compression failure is expected?

The suspension wire of our Shimadzu TGA-50 was disconnected. It was undamaged, so we anchored it back to the balance. However, during our next thermal analysis experiment, we experienced slight erratic increases and decreases in the temperature above 300 degrees Celsius. Any suggestions on how to remedy this issue? 

Basically I want to analysis the epsilon double prime versus epsilon prime curve..and from there I want to proceed into the conductivity analysis..

I am doing subzero heat treatment after quenching for en24 steel. And after subzero heat treatment am tempering it for 450c. So is it ok to go for 6 hours for subzero heat treatment or do we have to go for 24 hours only? 

Hi,

I used a cypher AFM with SKPFM (SKPM) technique to measure the surface volta-potential distribution for Mg alloys. But for a bare surface which has just recently been polished, I can not find a fixed potential value. However, it seems that potential difference (Difference between intermetallics and matrix is fixed.

for example if I change the used tip (used just for couple of hours) with a new one, the potential value increases.

Any comment and point is highly appreciated.

Best regards,

As we all know, cash is king at this time of year, so figuring out how to pay for the higher article publication fees is a concern. Could you kindly suggest some low-cost or free journals that publish high-quality research articles and have a high impact factor?

Everyone in the materials science and engineering field may have heard about the Ashby diagram --- a scatter plot which displays two or more properties of many materials or classes of materials. I am wondering whether it is possible/rational to plot the corrosion properties versus other properties (strength). It is well known that corrosion measurements are very sensitive and are impacted by many internal and external factors. So I am not sure if plotting corrosion vs strength would be a good idea. That is a diagram I had never seen. I would appreciate your comments on this topic as well as if you have seen a diagram of this type in the literature.

See an example for Ashby diagram in the attachment. In my case, I intend to plot Strength (Y axes) vs Corrosion properties (X axes).

Al A356

How to sift and separate particles of a certain size from a set of particles of different micrometer sizes?

for example we have 1kg of metal powder with size between 20 um to 120 um

we want to separate 30um particles, how can we do this?!

Initial surface absorption test

I am interested in purchasing a small uni-directional EDM machine for my lab. Simply for cutting metallic specimens off baseplates built by 3D printing. Very simple straight EDM. Does anyone have any recommendations on manufacturers  from whom they have purchased such small scale EDM machines?  Any recommendations would be most appreciated.

Has anyone in your laboratory equipment a VERSA TESTER? made by SOILTEST.Inc (Evanston Ill. USA)? I am looking for its user manual... Any help is greatly appreciated!!!

See the attached file.

Hi dears

does any one know how "LCF" Analysis in workbench is done?

note that i know how to do it for HCF.

Hi everyone, does someone know the work principles that VASP(The Vienna Ab initio simulation package) calculate elastic constant? I have checked many literature and they applied a matrix to unit cell, but I don't know if they are used by current version VASP(5.3.3). When I check OUTCAR, I can only find the elastic constants, but I cannot find where is the process, i.e, the matrix applied and the energy of strained lattice. Can someone tell me how to find those data, or introduce some literature about this?

With a given chemistry for a Ni-alloy 625 - how is the micostructure and strength affected by different heat treatment temperatures and holding times? And, what will be the strengthening mechanism in the different cases?

I want to see the grain boundaries of Aluminum Silicon eutectic alloy (Al-Si 12% wt), so what is the proper etchant and what is the etching procedure?

I am working on electrochemical properties of materials, I have specific capacitance of a material. Can I determine dielectric constant of the material? Please any one help me about this.

Can the 'k' & 'c' values be derived analytically using the volumetric data( % aggregate,%binder, %air voids,% PP replaced) for a hot mix design?

In what case would a reaction rate always show direct relation with activation energy or would it always be an inverse relation? Is it a indirect relation, inverse relation or both case can hold? (Please provide supporting resource, thank you).

Asphalt binder rheology field.

Is it needed to stress the layers to have lower contact resistance?

Is this stress useful or disrupt the layers in a bad way?

Acetaminophen has a λmax of 243 nm. Why is detection λ of HPLC set at 254 nm?

Environmental Earth Sciences (2020) 79:457

Can anyone suggest me some binder for Fe-Mn powders ?

I have a powder which is made from Co and Ni (without any other impurity). I will be appreciate if you tell me your suggestion to separate these metals and obtain pure Ni and Co.

I am a novice student doing a research project on water absorption in polymer composites with sodium silicate coating.

I want to ask about how to determine the result of the percentage of water absorption which is the sum of the percentage gain in body weight and the percentage of dissolved matter lost

for example, the conditioned weight is 9.76 grams then the wet weight at the time of immersion for 24 hours is 7.05 grams. Because there was a reduction in weight, my specimen was reconditioned with the result that the reconditioned weight was 6.83 grams.

Is it true that the percentage increase in weight was -27.77% and the percentage of dissolved matter lost was 30.02%? Then to determine the percentage of water absorption, just add (-27.77%) + (30.02%)?

Is there something wrong with my calculations?

please help in that case. thank you

I’m searching for possible applications for magnesium wire and rods. I considered fasteners (for example, screws, rivets, and bolts), springs , grids and meshes and bioresorble implants. Also I would like to discuss their potential. I’m not sure if Mg springs could get to industrial use, because of its low Young modulus of 45 GPa. But springs from aluminium with a low Young modulus of 70 GPa is commercially available. In my opinion screws have the best chances because with increasing use of Mg sheets more fasteners of the same material will be needed (e.g. to reduce galvanic corrosion).  Any ideas for other applications would also be appreciated. Thanks in advance.

I have a metal thickness gauge with twin crystal probe and It does not have the ability to correction V-Path automatically.

Hello Everyone What suitable model do you suggest for measuring the vertical tank roof thickness? (See attachment, Please)

We have a problem finding a suitable damage model for poylmer concrete. The most important characteristics of this concrete is that there are nonlinear elastic-plastic behavior with large volume change at the plateau zone at nearly constant pressure, pronounced hardening under clamping conditions after the plateau zone and very early damage under shear loading conditions without clamping.

Is there any relation between crystallite size and lattice strain with mechanical properties of the material like hardness, strength, corrosion properties etc. ??Please share some references also.

Thank you

 Exact ASTM standard for impact strength and flexural strength 

The value of stiffness/elastic modulus(Cii,Cjj) affects crystallographic planes in many ways like maximum shear or maximum tensile stress when stress is applied. The anisotropic materials show different response in a different plane in this case. That's why I want to know which Elastic modulus effects which plane in what way

Hello,

Please help me, who know how can solve problem " failure due to negative volume" in Ls-Dyna?

Thank you

Hello to all

Anodizing of SS304 creates a thick oxide layer on that. Is this layer non-electrical conductive? What thickness should be obtained in order to make the surface non-electrical conductive?

Could the presence of ligand on a catalyst surface reduced the reactivity of its surface? If yes/no, please explain why?

Is there any possibility of decreasing the corrosion rate with increasing the concentration of NaCl due to the formation of chromium oxide film on the stainless steel surface.

We are designing a probe with hydrogel substrate. Can polyacrylamide survive from 95℃，or is there any other type of hydrogel such as PEG that can survive from this temperature?

For now, i am dealing with specimen Mg alloy AZ31...immersed it in 3.5% NaCl...for time being, the corrosion rate of polished condition faster than the grinding condition..how does it comes? Previous researchers strongly said that grinding conditions tend to corrode faster than polished surface condition...

For above said properties what are the parameters need to be considered? Is the weight is the only parameter to calculate the % of  Chemical Resistance, Swelling, and Moisture Absorbance Behavior for Polymer Composite Materials?

It is well known that the plasma sprayed TBC has lower strian tolerance than the electron beam phsysical vapor deposition (EB-PVD) TBC. How can we say the TBC has high strain tolerance? which is the best parameter to represent this property? Young's modulus, fracture toughness? or any other special parameters?

Thanks!

zhonghua Zou

figuring out solubility of photo-polymerized Styrene.

i have couple of option for photo-polymerization but i need more information out of experiments.

How we determine sintering's condition (temperatures and soak- time) for growth material, especially for nanopolycrystal or general state?

Some articles show that DSC can not give the details about miscibility of drug and miscibility effect drug release from polymer.

how to define the part geometry of the powder particle and what can be the boundary conditions?

In powder metallurgy stearates are added while mixing of powders in order to facilitate compaction. Further these stearates are removed during dewaxing.

If zinc stearate is added as a lubricant during mixing of iron powder or other metallic based composites, does zinc stearate evaporates during sintering or remains there in the compacts.

Hi,

I am trying to analyze TiAlN coating structure through SEM. These coatings are deposited on a Silicium Wafer. These wafers are broken into parts before one can see the cross-section. Unfortunately due to unavailability of an inline detector I am unable to see a clear structure of these coatings. The SE detector does not allow to make clear images of these coatings. Later I have coated these TiAlN coatings with a thin Gold layer (2-10nn) to improve the conductivity of these coatings but unfortunately did not get better results. Here I would like to ask for a suitable preparation method for TiAlN coatings so that I can see them through SE detector.

Thanks

Indeed, I have observed that there is some scientific journals that listed in Scopus sources of not good quality from scientific point of view. At the same time some Universities are depending on Scoups in a similar manner to that of Thomson & Routers or Clarivate analytics.

I am working on Galfan coating and I need some of information for phase evaulation between steel and Galfan coating with microstructure photos. Anybody help?

Hi

Im currently trying to simulate adhesive single lap joints with a square wave geometry on the micrometre scale. I was wondering if anyone had any suggestions on how to get the elements to fail at a reasonable stress based on my cohesive law (damage initiation was set at 2MPa), they also fail unpredictably with some failing and others remaining present for the entire simulation.

The mesh has been refined whilsts keeping the layer one element thick.

Ive looked at most of the conventional things such as ensuring element deletion is switched on etc. Im not sure if theres any other consideration needed for such a complex geometry in which the adhesive consists of both vertical and horizontal components.

Ive tried running the simulation in Abaqus Explicit and using mass scaling to try and get a usable result, however it seems to be tricky finding suitable values for time increment, mass scaling factor

The image attached represents a section of the joint near the end with the undeformed and deformed images given. (from Abaqus Standard). Any help/ suggestions would be gretaly appreciated!