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The experimental function of the tensile testing machine
Category: Industry News
Electronic Tensile Testing Machine It can be found in many laboratories and factories. It is a mechanical testing device that can test a variety of materials. The device features accurate experimental results and ease of use. The role of materials mechanics experiments can be broadly summarized in three aspects:
It can measure the mechanical properties of materials. The strength indicators such as yield strength, ultimate strength, and endurance limit of materials, and the elastic properties such as elastic limit and elastic modulus are the basic parameters and basis for designing components. These parameters are generally determined by tensile testing machine experiments. With the continuous development of materials science, more and more new alloy materials and synthetic materials are constantly emerging, and the measurement of mechanical properties is the main task of researching various new materials.
Verify established theories. The theoretical formulas of materials mechanics are derived based on some assumptions, and their correctness and applicability must be verified through tensile testing machine experiments. Through this experiment, we can enhance our perceptual understanding, further understand the content of theoretical courses, and clarify the applicable conditions of theories and theorems. In newly established theories and formulas, it is even more necessary to verify them through tensile testing machine experiments.
Stress analysis: Experimental stress analysis is a discipline that uses experimental methods to measure the stress and strain states of components. Stress analysis of the tensile testing machine can check and improve design quality, improve the safety and reliability of engineering structures, and meet the requirements of reducing material elimination, reducing production costs, and saving energy. It can also provide a basis for developing new theories, designing new structures, creating new technologies, and applying new materials. Stress analysis of the tensile testing machine can not only promote the development of theory but also effectively solve many practical engineering problems that are difficult to solve theoretically. Therefore, it is an important means of solving practical engineering problems, just like stress analysis theory.
The correct use of the tensile testing machine fixture should be: When the clamping length of the specimen is the same as the tooth surface length of the fixture, first use external force to push the jaws to generate initial friction on the clamping surface, and then load the specimen through the movement of the electronic tensile testing machine beam. When the friction force pulls the jaws (wedge-shaped opening), the greater the axial tension, the greater the clamping force generated. According to the above clamping method, the wedge-shaped opening with two inclined surfaces on the testing machine fixture is designed to receive uniform compressive stress.
However, some operators do not operate according to the requirements of the electronic tensile testing machine. The sample holding length is too short, or the sample is processed too short, resulting in uneven stress on the inclined surface of the wedge, and the local stress on the wedge far exceeds the yield strength of the material, resulting in plastic deformation and serious outward turning of the wedge, causing collapse or wear of the inclined surface of the wedge. If the fixture is used under such circumstances, the angle of the wedge-shaped opening will decrease, the stress state of the fixture body will deteriorate, and slippage will occur.
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