Mechanical properties

Mechanical properties

Mechanical properties of the material refers to material in the different environment (temperature, medium and humidity), under various loads (tensile, compression, bending, torsion, impact, alternating stress, etc.) as well as the mechanical characteristics of.

Generally speaking, metal mechanical performance is divided into ten types:

Brittle brittleness is a property that does not have plastic deformation before it is damaged. It is the opposite of toughness and plasticity. Brittle materials have no yield points, fracture strength and ultimate strength, and they are almost identical. Cast iron, ceramics, concrete and stone are brittle materials. Compared with many other engineering materials, the brittleness material has a weak performance in the stretch, and the compression test is usually used to evaluate the brittle materials.

2. Strength: the ability of metal materials to resist permanent deformation or fracture under static load. At the same time, it can be defined as proportional limit, yield strength, fracture strength or ultimate strength. No single parameter can accurately define this feature. Because the behavior of the metal changes with the variation of the stress type and its application form. Strength is a very common term.

3. Plastic: metal materials under loading produce permanent deformation and does not destroy the ability of. Plastic deformation in metallic materials under stress, after more than elastic limit and load to remove the material retained some or all of the deformation of the load.

Hardness: the ability of a metal material to withstand an object that is harder than he is

5. Toughness: the ability of metal materials to resist impact loads without being destroyed. Ductility refers to the properties of metal materials that have a certain plastic deformation before the fracture occurs under the action of tensile stress. Gold, aluminum, and copper are ductile materials that can easily be pulled into wire.

6. Fatigue strength: resistance to fatigue damage caused by material parts and structural parts

Elastic elasticity is a property that enables the material to return to its original size when external forces disappear. Steel is elastic before reaching the elastic limit.

8. Ductility: Refers to the characteristics of the material subjected to a certain plastic deformation before the material fracture under the action of tensile stress or compressive stress. The plastic material is generally rolled and forged. Steel is both plastic and malleable.

9. Rigid rigidity is characterized by high stress in metal materials without great strain. The rigid size is evaluated by the elastic modulus of the material.

10. Yield point or yield stress is the stress level of the metal, measured in MPa. At the yield point above, when the external load is removed, the metal deformation still exists and the metal material has plastic deformation.

Mechanical properties test method

GB2649-1989 Test sampling method for mechanical properties of welding joint

GB2650-1989 Welding joint impact test method

GB2651-1989 Method for tensile test of welding joints

GB2652-1989 Method for tensile test of weld and deposition metal

GB2653-1989 Welding joint bending and flattening test method

GB2654-1989 Welding metal hardness test method

GB2655-1989 Test method for sensitivity test of welding joint strain aging

GB2656-1981 Fatigue test method for welding joints and weld metal

GB11363-1989 Welding head strength test method

GB8619-1989 The test method of the strength test of the strength

Performance indicators