Four-Point Bending

A Four-Point Bend Test is performed on plastic beams as shown in Figure 1. As a downward force (F) is applied in the middle of the beam, the flex (Δx) is recorded. The ratio (F/Δx) is the effective stiffness of the length of beam being tested, and is measured directly from the slope of the F vs. Δx graph. The Flexural Elastic Modulus for the material is then calculated.

Grade Level: College

Subject: Engineering

Student Files

	Compliance Calibration	2.24 MB
	Four-Point Bending	3.74 MB
	Compliance Calibration Tutorial	2.60 MB
	Four-Point Bending	3.21 MB
	Four-Point Bending	468.31 KB

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Bending: 3-Point and 4-Point

A Three-Point Bend test is performed on a round rod as shown. As a downward force (F) is applied in the middle of the rod, the flex (Δx) is recorded.

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Source Collection: Lab #05