Analysis of the performance index of square hardness

　　The performance index of 3 square - fatigue analysis

　　The strength, plasticity, hardness and mechanical properties of the metal pointer is under static load. In fact,many of the machine parts are working under cyclic loading conditions, in this part will produce fatigue.

　　Analysis of performance index of 4 square impact toughness

　　With great speed to load the parts called the impact load, the metal against damage under impact load is called impact toughness.

　　Analysis of performance index of the 5 square pipe strength

　　Strength refers to the metal material damage resistance under static loading condition (excessive plastic deformation or fracture) performance. Because of the effects of the way of load tensile, compression, bending,shear and other forms, so the strength is also divided into tensile strength, compressive strength, flexural strength, shear strength. Often there is some relationship between the use of various strength, generally totensile strength as the strength of the most basic pointer.

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