GFRP Composite Tear Out and Bearing Strength?
GFRP Composite Tear Out and Bearing Strength?
(OP)
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 tensile strength etc.? higher, lower?
RE: GFRP Composite Tear Out and Bearing Strength?
Neither is related to tensile strength. Tear out is a shear failure mode. Bearing is sort of a complicated compression failure mode.
Design with large edge margin (e/D = 3+) and you are unlikely to fail in tear out before bearing.
Bearing strength in double shear is usually greater than laminate compression strength.
RE: GFRP Composite Tear Out and Bearing Strength?
Apologies for the double posting - new to the forum and wasnt sur on the rules!
RE: GFRP Composite Tear Out and Bearing Strength?
Also watch your pin diameter selection, might be a little more susceptible to pin bending failure than a metallic joint, that said being gfrp the laminate is by far likely to be critical.
In metals Ftu can be a conservative preliminary estimate of Fbru, however I wouldnt advise that as a general approach for composites.
RE: GFRP Composite Tear Out and Bearing Strength?
Apologies for my ignorance - composites are a new area for me in terms of structural engineering.
RE: GFRP Composite Tear Out and Bearing Strength?
I think there's a reasonable example (though nore complex) for a metallic pin joint in the USAF stress manual (google it)
RE: GFRP Composite Tear Out and Bearing Strength?
RE: GFRP Composite Tear Out and Bearing Strength?
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.
RE: GFRP Composite Tear Out and Bearing Strength?