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Please note the 3 layers/plates are all different sections of GFRP in which the outer and inner layer are connected to one component and the middle layer is connected to another so the bonding between sections is prone to debonding when the outer and inners are pulled relative to the centre layer.

Hi Ng2020. If i understand you correctly - your opinion is that the composite being GFRP, its likely to be quite strong compared to the pin? The pin goes through very thick sections of composite. Two outers being 60mm and the inner bein 80mm. Apologies for my ignorance - composites are a new...

Thanks for all your responses SW composites. Apologies for the double posting - new to the forum and wasnt sur on the rules!

Thanks for all the help so far. I used Eurocode 3-1-8 for the pin design. You are correct - tear out strength is the important factor - how to find this for a composite however - I am unsure.

I have a bolt going through 3 composite layers loaded in double shear. I need to know the GFRP tear out strength and bearing strength to verify the integrity. Does anyone have any advice/applicable standards to calculate bearing strength and/or tear out strength? How does this usually relate to...

I used this standard for the pin design. Yes - tear out strength is more critical. I am unsure how to calculate tear out strength of the material however. I don't know how this relates to the materials tensile/compressive strength.

Hi kingnero. I should of specified - the laminate is a GFRP composite which complicates things further. Is that Eurocode 2(or 3?) you are referring too? Thanks for the info about the Hertzian contact stresses - I wasn't aware it was exclusive to steel on steel but I knew due to the crazy large...

Thanks for this input kingnero. The pins are a last resort mechanical reinforcement if the adhesive fails between the composite sections. Hope this clears up the application.

Hello, I am looking to cross pin (using a 10.9 grade stud) a laminate joint loaded in double shear to increase the strength in the joint beyond that given by the adhesive between laminate sections. Questions I have is related to bearing strength and stress. How is bearing strength of a...

Hello, I am looking to cross pin (using a 10.9 grade stud) a laminate joint loaded in double shear to increase the strength in the joint beyond that given by the adhesive between laminate sections. Questions I have is related to bearing strength and stress. How is bearing strength of a...