- #1
247killingtim
- 5
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Currently I am studying the mechanical properties of artery tissue, and was tasked with determining if the tissue fails due to shear stress or shear strain. I have always worked under the assumption that they go hand in hand with each other, but the nature of this question obviously suggests this isn’t necessarily the case.
After some research, I've found some sources (link below) suggesting that in anisotropic materials, materials where the mechanical properties are differ based on direction of loading/displacement, simple conversions between the stress and strain no longer hold true.
I’m most likely going to run experiments using both strain and stress as the independent variable and seeing which reaches failure first, but I’m having trouble finding any theoretical proof that this would be a valid conclusion. I was thinking that necking is an indicator for failure due to strain, but I couldn’t think of an observable property that would indicate failure due to stress. Additionally, since I’m doing direct shear tests I don’t think necking will be observable anyway.
Anybody have any ideas or a direction to point me?
http://www.failurecriteria.com/isitstressorstra.html
After some research, I've found some sources (link below) suggesting that in anisotropic materials, materials where the mechanical properties are differ based on direction of loading/displacement, simple conversions between the stress and strain no longer hold true.
I’m most likely going to run experiments using both strain and stress as the independent variable and seeing which reaches failure first, but I’m having trouble finding any theoretical proof that this would be a valid conclusion. I was thinking that necking is an indicator for failure due to strain, but I couldn’t think of an observable property that would indicate failure due to stress. Additionally, since I’m doing direct shear tests I don’t think necking will be observable anyway.
Anybody have any ideas or a direction to point me?
http://www.failurecriteria.com/isitstressorstra.html