3 point bend test
3 point bend test
(OP)
Does anyone know how to estimate the vertical deflection of a polymer test specimen (based on 2% strain) in a 3 point bend setup?
Thanks in advance.
Thanks in advance.
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RE: 3 point bend test
You can calculate the elastic deflection using the equation:
δ = [F l3]/[48 E I]
where
δ = beam deflection
F = applied force
l = beam length
E = elastic modulus
I = second area moment
You can calculate the onset of plastic strain in the outer fiber with the equation:
σ = [F l t]/[8 I]
where
σ = yield stress
F = applied force
l = beam length
t = beam thickness
I = second area moment
You can estimate the deflection at 2% strain by increasing the values a little over those for plastic strain onset.
Regards,
Cory
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