Rubber (hyperelastic) part failure estimation

[simulation_engineer_2022]

Hi everyone!

I was wondering if there is a simple way to estimate rubber part is exposed to failure or not.

For example if I have some hyperelasticity model coefficients ( Marlow, Yeoh, Ogden or any else) and I've finished FE-calculation of structure including rubber parts, how can I check if it safe case for my design? I mean for metals we can simply compare calculated stress with material yield stress (as an first estimation), or check endurance limit; is there similar approaches for hyperelastic components?

Best regards

 

[FEA way]

Generally speaking, strain-based failure criteria are used for hyperelastic materials.

Check this thread:

https://www.eng-tips.com/viewthread.cfm?qid=135353

 

[simulation_engineer_2022]

Thanks, FEA way!

This article's authors refer to hyperelastic material fail under tension or shear strain. Is it correct to state that there is no fail of rubber under compression?

Best regards

 

[FEA way]

Rubber may also fail in compression (it's less likely though). Thus, allowable compressive strain is used.

 

[GregLocock]

It is very rare for a realistic rubber component to fail in pure compression, what normally happens is that any free surface balloons out and fails locally in tension. If you fully constrain the rubber and compress it then you just get hydraulic type uniform compression and no failure can occur.



Cheers

Greg Locock


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