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problem with bolt connectors and thermal load

Question asked by Michael Bartel on Apr 10, 2019
Latest reply on Apr 11, 2019 by Michael Bartel


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?