Zhejiang mechanical performance testing tensile bending impact flattening test
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Tensile test tensile test
Tensile test is a test to determine the properties of a series of materials under tensile load. It is one of the basic methods for testing the mechanical properties of materials, which is mainly used to check whether the material meets the prescribed standards and the properties of the materials studied.
One of the basic methods for testing the mechanical properties of materials is to determine the mechanical properties of materials subjected to bending loads. Bending test is mainly used to measure the bending strength of brittle and low plastic materials (such as cast iron, high carbon steel, tool steel, etc.). Bending test can also be used to check the surface quality of the material. The bending test is carried out on a universal material machine with two loading modes of three point bending and four point bending (see chart). The cross section of the test specimen is circular and rectangular, the test span is generally 10 times the diameter of the. For the brittle material bending test, only a small amount of plastic deformation can be destroyed, but the bending strength can not be measured for the plastic material. The bending test of plastic material is called cold bending test. During the test, the specimen was loaded to a certain degree, and the surface of the specimen was observed without cracks.
Impact test impact test
The test of impact resistance of metal materials, also known as impact toughness test. It is one of the basic test methods for mechanical properties of materials. In the impact test, the work consumed by the impact test is called the impact work, and the unit is J (joule), which is expressed as A. The A divided by the cross-sectional area of the specimen F, get A/F=, its unit is Joule / cm ((J/cm), known as the material impact value. Can be used to assess the degree of toughness and brittleness of materials, but can not be directly used for design calculations.
The impact test is very sensitive to the tissue defects of metal materials, and can be used to detect the defects and microstructure changes during the process of smelting and processing. The same in samples from high to low temperature impact test, impact toughness (or impact toughness) will be from large to small, crystalline fracture by less than plastic deformation from large to small, indicating that the material is composed of ductile state transition to brittle state, 50% crystalline fracture area when the temperature known as the ductile to brittle transition temperature or brittle transition temperature usually appear on the fracture surface.
Flattening test is limit plastic deformation ability test metal tube under the given conditions the flattening deformation without cracking defect, the principle is perpendicular to the longitudinal axis direction of the metal tube of the specified length sample or metal tube force end pressure shut, until in two under the action of force plate distance to reach the relevant product standards the specified value