(mm/mm)
* = flexural Modulus of elasticity,(MPa)
* = load at a given point on the load deflection curve, (N)
* = Support span, (mm)
* = Width of test beam, (mm)
* = Depth or thickness of tested beam, (mm)
* = maximum deflection of the center of the beam, (mm)
* = The gradient (i.e., slope) of the initial straight-line portion of the load deflection curve, (N/mm)
* = The radius of the beam, (mm)

Fracture toughness testing

The

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