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3 point bend test
- Thread starter SH2
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What is your definition of strain?
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
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
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
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
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