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I need to work out the flexural modulus (E_{f}) of a test specimen that is subjected to a 3-point bend test. I know that: E_{f}= L^{3}m/4bd^{3}. I have:

Support Span(L)= 0.1m

width(b)= 0.01m

depth(d) = 0.01m

Max normal stress σ_{f}= 98.1 MPa

Strain (ε_{f}) = 0.0525

Max force (applied to the center of the beam) = 656 N

Max deflection = 0.0089m

Specimen length = 0.14m

My question is, how do I work out 'm'? m is defined as "The gradient (i.e., slope) of the initial straight-line portion of the load deflection"

Thanks in advance.

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# Flexural Modulus of a Test Specimen (3-point bending)

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