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How can be the strain greater than unity?

How can be the strain greater than unity?

How can be the strain greater than unity?

(OP)
Does anyone know how can the plastic strain be greater than  unity? Such as in the benchmark manual 3.2.10 Indentation of a crushable foam plate:
 
*CRUSHABLE FOAM HARDENING
 0.2000E6, 0.0000
 0.2577E6, 0.0094
 0.2760E6, 0.0258
 0.3053E6, 0.0452
 0.3267E6, 0.0655
 0.3623E6, 0.1084
 0.3891E6, 0.1540
 0.4250E6, 0.2405
 0.4568E6, 0.3812
 0.4738E6, 0.4600
 0.5170E6, 0.6391
 0.5862E6, 0.8570
 0.6503E6, 0.9857
 0.7470E6, 1.1324
 0.9820E6, 1.2965
 1.4702E6, 1.4808
 2.7262E6, 1.6609
 5.3911E6, 1.9000

RE: How can be the strain greater than unity?

You seem to be under the impression that a plastic strain greater than 1 is somehow not allowed.  Why?  There's nothing magical about a strain of 1 (or unity as you called it).  This material can simply handle a significant amount of deformation before reaching its ultimate stress.

RE: How can be the strain greater than unity?

Plastic strain is defined in terms of 'True' strain. This may explain why it can be greater than 1.

Gurmeet

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