Questions tagged [stress-strain]

Questions related to the physical quantities of stress and strain in materials systems.

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How to perform Strain induced properties in Quantum ESPRESSO?

I have to perform strain engineering in a material. The strain would be expansive strain and compressive strain. How do I perform those both? I am currently using the ...
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8 votes
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How to distinguish between deformation mechanisms in creep experiment?

As I'm learning more about viscoelasticity and creep experiments, I'm trying to understand how to distinguish between the different deformation mechanisms. In general, when a sample of viscoelastic ...
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5 votes
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Define stress-strain for a multi-wall carbon nanotubes bundle

I want to simulate a MWCNT bundle in which the central MWCNT is pulled out of the bundle. How to define the stress/strain curve of such system? I am building my system with scikit-nano and using ...
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9 votes
1 answer
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How to find the Cauchy stress tensor in solids using ab-initio methods?

I want to find the Cauchy stress tensor in certain materials with ab initio methods. I already have the analytical form of my own definition of "energy" and "forces" (not from DFT),...
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8 votes
2 answers
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Mathematical models for the plastic region in the tensile test

The tensile test of a material consists of subjecting a standardized specimen to an increasing axial tensile stress until it breaks. During its performance in the laboratory, we can plot a stress-...
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12 votes
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A viscoelastic material with nonconvex memory kernel?

The title is basically my question. Viscoelastic materials are characterized by a constitutive equation between stress and strain involving a convolution integral. This integral is weighted with a ...
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  • 121
20 votes
3 answers
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How to find Young's Modulus using stress strain curve using Python?

I am trying to find the The Young's Modulus of an aluminum alloy The yield stress Below is the data for the stress-strain curve. I tried finding the region where the slope is constant and to my ...
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16 votes
1 answer
165 views

How does a complete basis set remove Pulay forces/stress?

When finding nuclear forces for the true electronic wavefunction, thanks to the Hellmann-Feynman theorem we only need to consider explicit derivatives with respect to the nuclear coordinates $\mathbf{...
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