problem about plastic dissipation energy in the calculation of abaqus explicite

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problem about plastic dissipation energy in the calculation of abaqus explicite

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Hi everyone  Consult a problem about plastic dissipation in abaqus explicite calculation. Compressed a structure and it started with elastic deformation. Near the end it is in the state of plastical deformation locally. In this process, the plastic dissipation energy of the structure is zero at the beginning, then it gradually increases. But it finally becomes negative. The attached picture shows this process. The plastic dissipation is negative, does it mean that something is wrong in the calculation?
Wenyu Beijing Union University

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