I've built an incubator with an electrode at the center with the purpose of cell culture, screwing a block with copper tape at each of the ends of the electrode to pass current, but given the fact I need the incubator to have a temperature of 60ºC the nuts and bolts come flying out when I reach that temperature. How would you prevent it? adding weight to the blocks? changing the types of bolts? or what would you change in the design? Here is an very rough schematic of what I'm talking about. https://i.imgur.com/HkY7kSS.png

Any help is greatly appreciated

 

Please post your photos here.

What do you mean "nuts and bolts come flying out?" I need a lot more explanation to have any clue what is going on.

 

The thermal volumetric coefficient of expansion for copper is approximately 60% greater than for carbon steel. So if you are presently using steel nuts and bolts, see if you can locate brass fasteners to try out. The copper would expand at about 12% more than the brass fasteners ... You would just have to see if it works.

 

Use locknuts.