It might not be possible, but if you want to use thermal strain to simulate the effect of the unwanted chemical reaction you can do it in a separate analysis as I described before. Before solving in the first analysis you issue INISTATE,WRITE. This will write the stresses to a file name file.ist. Then in a completely new analysis you can issue INISTATE,READ to read those stresses into the 2nd analysis and input the 40/30 deg temperature.
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