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polymer fracture in ansys/abaqus

Can any one tel how to simulate numericall and analytically fracture in polymers?

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It depends on what type of polymer you're trying to simulate. For brittle polymers, LEFM should be able to work. While for many ductile polymers, elastic-plastic fracture mechanics should be used. 

Iam presently working on LLDPE.

Can you please berif on what are the major changes from fracture in metals

PE has significant plasticity compared with  most metals. Basically, fracture is impossible when plasticity is too huge, only necking occurs. What is the service condition of your LLDPE?

It is used to analsys the fracture toughness when used in automobile fuel tanks.

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