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## Summary:

- I'm trying to determine the impact of stiffness (Young's modulus) on the tendency of 'stress failure' with a given strain.

Hi. I'm a physician trying to understand the micromechanics of lung injury due to overdistension. The basic idea is that overstretching of the plasma membrane of the lung epithelial cell causes "stress failure" --> i.e. plasma membrane rupture --> cell death. The concepts of stress, strain, and Young's modulus (E) are utilized to study this: Stress = E x Strain, or Strain = Stress/E

Say object 1 has a stress = x, strain = y

Say object 2 has Young's modulus twice that of object 1, and the same stress (x) is applied

hence for stress = x, strain = y/2

So object 2 sees same stress (x) but half the strain (y/2) compared to object 1. What can be said about its chances/tendency for 'stress failure' compared to object 1: same or half?!

Would appreciate any insight.

Best.

Say object 1 has a stress = x, strain = y

Say object 2 has Young's modulus twice that of object 1, and the same stress (x) is applied

hence for stress = x, strain = y/2

So object 2 sees same stress (x) but half the strain (y/2) compared to object 1. What can be said about its chances/tendency for 'stress failure' compared to object 1: same or half?!

Would appreciate any insight.

Best.