What are the mechanical properties of metal materials?

1. Mechanical properties of metal materials.

Including: 1. Strength.

2. Flexibility. 3. Plasticity.

4. Hardness. 5. Toughness.

6. Fatigue. 7. Creep.

2. Mechanical properties are also called mechanical properties, and commonly used mechanical properties include four major indicators.

1. Strength index, divided into tensile strength.

yield strength, etc.

2. Hardness index, Brinell hardness.

Rockwell hardness and Vickers hardness, etc.

3. Plasticity index, including section shrinkage and elongation.

4. The toughness index is the impact toughness.

The mechanical properties of metal materials are the main basis for the design and selection of parts. Depending on the nature of the applied load (e.g., tensile, compression, torsion, impact, cyclic load, etc.), the mechanical properties required for the metal material will also be different. Commonly used mechanical properties include:

Strength, plasticity, hardness, impact toughness, multiple impact resistance and fatigue limit, etc. 1 Intensity.

Strength refers to the resistance of a metal material to failure (excessive plastic deformation or fracture) under static load. Since the load acts in the form of tensile, compression, bending, shear, etc., the strength is also divided into tensile strength, compressive strength, bending strength, shear strength, etc. There is often a certain relationship between various strengths, and tensile strength is generally used as the most basic strength index in use.

2 Plasticity.

Plasticity refers to the ability of a metal material to produce plastic deformation (permanent deformation) without damage under load. 3 Hardness.

Hardness is a measure of the hardness and softness of a metal material. At present, the most commonly used method for determining hardness in production is the indentation hardness method, which is to use a certain geometric indenter to press into the surface of the tested metal material under a certain load, and determine its hardness value according to the degree of indentation.

Commonly used methods include Brinell (HB), Rockwell (HRA, HRB, HRC) and Vickers (HV). 4 Fatigue.

The strength, plasticity, and hardness discussed above are all indicators of mechanical properties of metals under static load. In fact, many machine parts work under cyclic loads, and under such conditions the parts develop fatigue.

5 Impact toughness.

The load acting on the part at a great speed is called the impact load, and the ability of the metal to resist damage under the impact load is called the impact toughness.

1 Intensity. 2. Flexibility.

3. Plasticity. 4. Hardness.

5. Toughness. 6. Fatigue.

7. Creep. Second, mechanical properties are also called mechanical properties, and the performance of commonly used mechanical properties includes four major indicators.

1. Strength index, divided into tensile strength, yield strength, etc.

2. Hardness indexes, including Brinell hardness, Rockwell such as search hardness and Vickers hard search degree.

3. Plasticity index, including section shrinkage and elongation.

4. The toughness index is the impact toughness.

Tensile, yield, elongation, section shrinkage, impact energy, these properties can basically meet the mechanical application of a metal, if it involves fatigue and fracture, then it is necessary to refine the metal pants Qingwax grains, which belong to the microscopic level.

The properties of metal materials can generally be divided into two categories: use performance and process performance. The use performance refers to the properties that the material must have under working conditions, including physical, chemical and mechanical properties.

Physical properties refer to the properties of metal materials under various physical conditions. Including: density, melting point, thermal conductivity, electrical conductivity, thermal expansion and magnetism, etc.

Chemical properties refer to the ability of a metal to resist chemical attack by an external medium at room or high temperatures. Includes: Corrosion resistance and oxidation resistance.

The mechanical properties of metals are the most important properties of metal materials, and the so-called mechanical properties of metals refer to the properties of metals that are related to elastic and inelastic reactions or involve stress-strain relations under mechanical action. It includes: strength, plasticity, hardness, toughness and fatigue differential strength.

The process performance of metal materials directly affects the process quality of parts after processing, and is one of the factors that must be considered when selecting materials and formulating parts processing routes. It includes casting performance, pressure processing performance, slip welding performance, cutting performance and heat treatment performance.

1.Modulus of elasticity: In the stage of elastic deformation, the stress and strain of a material are proportional (i.e., in accordance with Hooke's law), and its proportionality coefficient is called the modulus of elasticity, and the unit is MPa.

2.Tensile strength: Tensile strength is the critical value of the transition from uniform plastic deformation to local concentrated plastic deformation of metal, and it is also the maximum bearing capacity of metal under static tensile conditions.

3.Yield strength: Yield strength is the yield limit of the metal material when the yield phenomenon occurs in the bulk material, that is, the stress that resists trace plastic deformation.

For metal materials without obvious yield phenomenon, the stress value that produces residual deformation is specified as its yield limit, which is called conditional yield limit or yield strength.

4.Elongation after breaking: refers to the percentage of the elongation length of the test rod (post-fracture gauge distance) and the original length (original gauge distance) when the metal material is fractured by external force (tensile force).

5.Section shrinkage: Section shrinkage is a performance index that measures the plastic deformation ability of materials. Tested with a standard tensile test. The difference between the cross-sectional area of the necking part and the original cross-sectional area when the specimen is pulled off is the percentage of the quotient of the original cross-sectional area divided by the cross-sectional shrinkage.

6.Impact toughness: Impact toughness refers to the ability of a material to absorb plastic deformation and fracture work under impact load, reflecting the subtle defects and impact resistance of the material.

7.Hardness: Hardness, a professional term in physics, the force of the material to resist the local hard object pressing into its surface is called hardness, and metal materials are usually tested for Brinell, Vickers and Rockwell hardness.

The basic properties of metal materials mainly include: density, melting point and boiling point, specific heat capacity, expansion coefficient, thermal conductivity, resistivity and temperature coefficient, mechanical properties, elastic coefficient, friction coefficient.

Metallic materials refer to materials with properties such as luster, ductility, easy conductivity, and heat transfer. Generally, it is divided into two types: ferrous metal and non-ferrous metal. Ferrous metals include iron, chromium, manganese, etc.

The properties of metal materials determine the scope of application and the rationality of application. The properties of metal materials are mainly divided into four aspects, namely: mechanical properties, chemical properties, physical properties, and process properties.