I am trying to run an analysis of a clamp assy. (see attached pic.) The donut shape is 17-4 SS and the 2 darker grey parts are 6061-T6 aluminum. Alloy M4 bolt connectors are defined as follows: each bolt passes through a hole in the top part and threads into the bottom part. A torque of 27in-lbs. is applied.
I want to see the effects on the bolt loading when this assy. in 60 C environment. So I run this study with no thermal load and then with a 60 C thermal load applied to all exposed faces.
The results show me that axial load in the bolts decreases in 60 C and they definitely should be getting higher due to the different CTEs.
What am I doing wrong?