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Effective Plastic Strain?????

Effective Plastic Strain?????

Effective Plastic Strain?????

(OP)
Hello everyone,

Can any please let me know, what exactly is effective plastic strain as I am bit confused about it.
Is there any formula for this or do we have to calculate from stress-strain data?

Thanks!!!

RE: Effective Plastic Strain?????

You're going to have to provide some context to this question before you get any responses.

RE: Effective Plastic Strain?????

(OP)
I want to perform crash analysis in LS Dyna.
My material Aluminium honey comb block.
Since I have shell model so I am using Piecewise Linear Plasticity model in LS Dyna so in this material model I need to use Effective plastic strain values and corresponding yield stress values. Actually I am confused about what does this effective plastic strain mean? and is it possible from compression test to obtain Stress vs Strain data? which I can use for this analysis. And values from Engineering or true stress-strain curve do we have to use for such analysis?
I am preety much new in crash analysis field and finding these material properties for honeycomb is little difficult for me now. So I hope anyone with knowledge of compression or tensile test and how to extract that data from test to obtain stress-strain curve will be really helpful.

Thanks

RE: Effective Plastic Strain?????

(OP)
@Jetgirl8
Many thanks for the link. Recently I had training for LS Dyna but finding material properties to use in those material  cards is little difficult as of now cause I am trying to which test shall I perform so that I can end up with yield stress v/s effective plastic strain plot

 

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