Purpose of the Test
Flexure tests are performed to determine important mechanical characteristics. The laminate of the specimen is loaded on the bottom with a tensile force and on the top with a compressive force. No force is applied to the laminate planes in the middle. Furthermore, in this test setup, in-plane shear stresses arise, which can be minimized by selecting a wide span in proportion to the thickness of the specimen. In the case of multi-directional laminates, a flexure test can be used to identify layup errors, which is useful for quality control and goods inwards checks. In flexure tests, precise alignment of the tool's supports and dies is also mandatory to achieve accurate and reproducible test results. Zwick has developed special flexure tools for these types of tests, in which all elements can be adjusted to one another with precision.