Measuring Flexural Strength
For a rectangular sample under a load in a three-point bending setup (Fig. 3):
- F is the load (force) at the fracture point (N)
- L is the length of the support span (mm)
- b is width (mm)
- d is thickness (mm)
For a rectangular sample under a load in a four-point bending setup where the loading span is one-third of the support span:
- F is the load (force) at the fracture point
- L is the length of the support (outer) span
- b is width
- d is thickness
For the 4 pt bend setup, if the loading span is 1/2 of the support span (i.e. Li = 1/2 L in Fig. 4):
If the loading span is neither 1/3 or 1/2 the support span for the 4 pt bend setup (Fig. 4):
- Li is the length of the loading (inner) span
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