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Oscillation and time increment problems in VUMAT coding

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Dear all,

Im working on an one-element (C3D8R) uniaxial tensiling test with the VUMAT subroutine offered by Simula answer 3123. In my case the loading condition is quasi-static so I did not consider any stress damping issues in the code. I thought this work would be easy but it turned out the calculation suffered from severe oscillation problems and unacceptable incremental time (less than 1e-6). Can anyone tell me why this happens? Ive also upload my input file and the subroutine here. Thanks!

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