Glass crack on aluminum and copper tungsten

Hello everybody,



I am here to find an answer for my experiment.Thank you in advance.



Here is the issue I met.Could you refer to attached file?



1.We glued one piece aluminum block and one piece copper tungsten block on substrate.

The aluminum and copper tungsten block have different height.The glue thickness underneath them

is different.

2.Then,we glued one piece glass on aluminum block and copper tungsten block.



3.However,after 120°C storage for overnight,we found crack as marked in the red.

We suspect the crack is due to thermal strain/stress.

4.We want to find a way to calculate the thermal strain/stress on the glass.



5.Can any body help me out? Really appreciate it.



Thanks

Attached Files

Picture.docx (42.9 KB)