How does a tensile tester detect three bending strengths?
Through the testing test of plastic bending strength by tensile testing machine, we know the structure and application method of the bending test attachment in the pulling machine and obtained the bending strength, bending elastic modulus and stress-strain curve of the plastic.
Rally machine provides two sets of capacity test space, so that the operator has a greater range of use, especially when the raw material and finished product test when the power gap is most suitable. The type used on the floor type, mainly in the steel wire, small screw fabrics and other industries Most often used.
The bending strength refers to the strength of the specimen when it is placed on the two fulcrums of the pulling machine by simple beam method, and the concentrated load is applied between the two fulcrums to deform the specimen until it is destroyed. For non-brittle materials, the yield phenomenon occurs when the load reaches a certain value. The load at this time is also called the failure load. Its strength is called the static bending yield strength. The flexural modulus of elasticity refers to the ratio of the bending stress to the strain within the proportional limit of the material.
The standard test method for bending strength is three-point bending and four-point bending, and the qualitative distribution of the loading mode, bending moment, and shear force. The difference between the three-point bending and the four-point bending is that there is shear force in the middle of the specimen, so the measured strength is not the strength under pure bending.
In order to eliminate the effect of shear stress, it can be compensated by increasing the span of the sample and increasing the radius of the loading head. It is also possible to use the four-point bending test method for experiments. However, the specimen required for four-point bending is long and the structure of the loading head is complicated. The load balance is not easy to guarantee in the experiment, and the three-point bending test is simple and applicable. Therefore, the three-point bending is commonly used in plastic bending experiments. Methods. This experiment was also conducted using a three-point bending method.
Because the thickness has a great influence on the deflection, if the actual thickness of the plate is different from the thickness of the required sample, it must be corrected by mechanical processing. However, at this time, attention should be paid to the addition of one machine, and the machined surface should be used in the tensile machine experiment. Load the indenter so that the unmachined surface is stretched. This has no effect on the experimental results.
The factors that influence the bending experiment include the size and processing of the sample, the radius of the indenter, the radius of the bearing surface, the experimental span, the experimental speed, the experimental environment, and the material properties. Generally the thickness and width of the bent specimen are related to flexural strength and deflection. Increasing the thickness and width to increase the cross section of the specimen increases the resistance to bending deformation.
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