Recently I've been asked about a possibility to predict the aging effect for simple bolt joint. There are some dissimilar material used in the joint like copper alloy 182 for a bolt and carbon steel for a nut. I'm pretty sure that there will be some deformation on the copper part due to applied torque and additional vibration loads during the life cycle. So, initial snapshot for the stress or deformation will be different in a week, or in month, or even in years. If this is very important joint in assembly , is there any way to simulate the material / joint aging effects in SW simulation ? Or is there 3-rd party CAE software to deal with such effects ?