MAT_CONCRETE_DAMAGE_REL3

[Young Gu Chung]

Dear Air/Madam.

  I am Dr. Chung, studying concrete behavior in Korea. I am using MAT_CONCRETE_DAMAGE_REL3 in LS-DYNA R14 to perform blast analysis. When I set A0 = –21 MPa and run the simulation, I can see the following results in the message file. 

Based on these results, I plotted the three strength surfaces as shown below. However, the residual surface appears to be higher than the yield surface, which I find somewhat unusual. What do you think about this?

Kind Regards,

Chung

[l...@schwer.net]

There is possibly some confusion on your part as to the meaning of Yield as used by this model.

 

In a uniaxial compression test, the stress versus strain response is initially elastic and then transitions to elastic-plastic (nonlinear). At that point the sample’s yield strength has been attained. Continue loading results in failure of the specimen.

 

This is similar to the behavior of metals: elastic, yield and failure.

 

                                --len

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