![]() Optical measuring systems use image correlation algorithms: In the high-resolution images, they recognize the deformation caused by the bending test and then calculate the deflection using the pixel coordinates of the dot pattern. The material tester first applies a stochastic dot pattern to the sample or uses the existing surface structure. More complex sample geometries can be accurately measured using two cameras. For the documentation of flat specimen, devices with a single camera are usually sufficient. Dealing with ductile materials, the limit yield point, the greatest possible bending angle as well as Young’s modulus are determined, in case of an elastic deformation.ĭuring materials testing using a bending test, modern optical measuring systems with high-resolution cameras provide precise images of the test specimen. In case of brittle materials, the bending strength is determined this way. Bending tests are performed to obtain information about the bending behavior of the tested material from the single-axis bending stress. The entire test sequence is shown in a stress-strain curve and can also be recorded with a video camera. The material characteristics are then determined. The maximum load exerted during the bending test is called breaking force.ĭuring the test, the values of the bending force and deflection are recorded. The test punch, which moves down slowly and at a constant speed, loads the sample with increasing force until it breaks or reaches the previously determined deformation. The diameter of the cylindrical specimen is proportional to the support width of the bearings. The rounded support rollers (bearings) are arranged parallel to each other at a certain distance (support width). In bending tests, standardized, mostly cylindrical specimens are placed in the center of the checking fixture. Depending on the number of pressure points and the support of the test specimen, a distinction is made between the following: ![]() Bending tests are similar in their sequence. ![]() Destructive materials testing is used for plastics, fiber-reinforced plastics (FRP), metals and ceramic materials. A bending test (bending tensile test) is a method of testing materials for their bending strength and other important properties. ![]()
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