Four-point bending
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a
l
E
m
,
g
=
3
a
l
2
−
4
a
3
2
b
h
3
∗
2
w
2
−
w
1
F
2
−
F
1
E_{m,g}=\dfrac{3al^2-4a^3}{2bh^3*2\dfrac{w_2-w_1}{F_2-F_1}}
E
m
,
g
=
2
b
h
3
∗
2
F
2
−
F
1
w
2
−
w
1
3
a
l
2
−
4
a
3