Talking about the Necessity of Metal Tensile Test

In the metal manufacturing process, a very important mechanical property is the tensile ability of the metal. Metal tensile test is one of the most common and important test methods in the mechanical property test of metal materials. It is related to the toughness and strength of the metal. The tensile performance is determined by the tensile test. The material strength and plastic performance data obtained from the metal tensile test have important application value and reference for the design and selection of materials, the development of new materials, the procurement and acceptance of materials, the quality control of products, and the safety and evaluation of equipment. value. Metal tensile test is generally divided into four stages: 1. Elastic stage: As the load increases, the strain increases in proportion to the stress. If the load is removed, the specimen will return to its original state, showing elastic deformation, and the elastic modulus of the material can be measured at this stage. 2. Yield stage: Plain carbon steel: After the elastic stage, the load is almost unchanged, but fluctuates up and down in a small range, and the elongation of the sample increases sharply. This phenomenon is called yielding. 3. Strengthening stage: After the sample passes the yield stage, if it is to continue to elongate, the resistance of the sample will continue to increase due to the continuous strengthening of the material in the plastic deformation process. As the strain increases, the stress also increases, and the maximum force is the limit value of the tensile strength of the metal material. 4. The necking stage: when the strain increases and the stress drops, the metal material will produce a 'necked' state until it breaks. We can test a series of mechanical properties such as the strength, hardness, fatigue, etc. of the material through the metal tensile experiment. As a stamping parts processing plant, only after fully understanding the properties of the material can it safely formulate the application environment of the material, and then put it into production with confidence, and process and produce high-quality and qualified stamping parts. Recommended article: Introduction to the drawing process of stamping parts Previous: Small knowledge of drawing parts-selection and design