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<p>Hi again,<div><br></div><div>I really cannot assess the quality of your DDSDDE as I have not checked your model, and yes, it could also be inaccurate. For my UMAT code, I need to find it among my very old files, and I am not sure I still have kept it, but <span style="word-spacing:normal;">If you need it, please send an email to me ([email protected]). </span><span style="word-spacing:normal;">In my UMAT code, I used a single DDSDDE array for both before and after damage so that the damage parameter was always in my STRESS tensor. I did not have two different DDSDDE, and instead, the </span><span style="word-spacing:normal;">damage parameter </span><span style="word-spacing:normal;">acted as a material parameter, </span><span style="
word-spacing:normal;">which gradually was changed depending on the values of the other parameters. So, I have not done any other modification on my DDSDDE after damage.</span></div><div><span style="word-spacing:normal;"><br></span></div><div>If the divergence arose by the localization effects, your strategy of using the artificial viscosity is entirely reasonable unless their amount was not considerable, considering that this method is generally used for any local instabilities, such as surface wrinkling, material instability, etc.</div><div><span style="word-spacing:normal;"><br></span></div><div><span style="word-spacing:normal;">If your DDSDDE for the damaged model was not accurate, but the solution was converged, go for it, and do not care about the DDSDDE. Because most probably, it
cannot have affected your model on condition that the other parts of your code were precise. In case you have significant divergence issues, m</span><span style="word-spacing:normal;">ake sure your code is accurate by </span><span style="word-spacing:normal;">checking</span><span style="word-spacing:normal;"> </span><span style="word-spacing:normal;">the </span><span style="word-spacing:normal;">output</span><span style="word-spacing:normal;"> of </span><span style="word-spacing:normal;">each line and check your algorithm and the mathematical equations. </span><span style="word-spacing:normal;">If you couldn't find the source of errors, changing the material model or your overall model might help. DO NOT WASTE YOUR TIME ON ONE PARTICULAR UMAT.</span></d
iv><div><span style="word-spacing:normal;"><br></span></div><div><span style="word-spacing:normal;">Finally, I highly recommend you to use the USDFLD subroutine so that you can implement your damage model with your possibly accurate DDSDDE without damage in your UMAT code, and </span><span style="word-spacing:normal;">you can check the accuracy of the DDSDDE by comparison</span><span style="word-spacing:normal;">. So, you do not need to include your damage model in your UMAT, and in some cases, you also do not need even to use UMAT subroutines at all!</span></div><div><br></div><div><span style="word-spacing:normal;"><br></span></div><div><span style="word-spacing:normal;"><div>Sincerely,</div><div>Seyed Shayan Sajjadinia</div><div>Ph.D. Student at Unibz</div></span></div></p>
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