koii123

Thanks so much, you are right, i think i need to find out the real bond strength in terms of N/mm2, the results looks too strong! assume that the shear and the tensile are right, so, at least 6060N pulling force is required to pull out the blue board, because it is smaller that 6480N, am i right? if the wedge change to other shape (for example, rectangular), how will the calculation be affected?

thank you, actually, this is a mechanical repair (for pure mechanical loading), there is nothing related to electric circuit, Here are the dimensions of the adhesives: All the wedges have height 3mm (Z-direction) (the same as the PCBs), and width is 1mm (x-direction), The long 80mm adhesive is 1mm thick (y-direction) and height is 6mm (z-direction). Also, I read from the adhesive (Epoxy) specification sheet, the adhesive have the following properties: tensile: 22N/mm2 shear: 18N/mm2 i would like to know whether the adhesive i selected is strong enough to hold the boards together under the 50N force. and this is the only objective of this problem.

thank you for help, actually, the grey board is fixed and it is not cracked, i cannot add glue under the blue board, this is a very special application, and it is complicated to explain it here, sorry for that, due to some boundary conditions, i can only add glue in this way, do you know how to do calculations in a situation like that ?

sorry, perhaps i should make it more clear.... this is not a homework, this is a real case, because i have a component damaged, i would like to repair it with a glue, and i would like to find out whether the glue is strong enough to withstand the 50N upward force, so i try to apply mathematical techniques, actually, the following picture describes my current situation, do you know how to do it? i really don't have any idea

suppose i have 4 solids like this: and the solid have shear stress and tensile stress 12N/mm2 and 15N/mm2 respectively, suppose i know the area of each surface, how can i judge whether this solid is able to withstand 20N load? what kind of formula should i use?