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五、金属材料的基本机械性能有哪些?金属材料受机械力作用时,所表现的抵抗破坏的能力,称为机械性能。主要的机械性能有。1.强度:材料在受到外力作用时的最大抵抗能力(单位是公斤/毫米~2)。根据载荷作用的不同又分为抗拉强度σ_b、抗压强度σ_bc、抗弯强度σ_bb等。2.硬度:金属表面上不大的面积内抵抗变形或抵抗破坏的抗力。常用的硬度有布氏硬度HB、洛氏硬度HRC、维氏硬度HV等。3.弹性极限σ_e∶材料不产生永久变形所能承受的最大负荷时的应力,单
Fifth, what are the basic mechanical properties of metal materials? Metal materials by mechanical force, the performance of the ability to resist damage, known as the mechanical properties. The main mechanical properties are. 1. Strength: the maximum resistance of the material when subjected to external forces (in kilograms / millimeter ~ 2). According to the role of load is divided into tensile strength σ_b, compressive strength σ_bc, bending strength σ_bb and so on. 2. Hardness: a small area on the metal surface to resist deformation or resistance to damage. Brinell hardness HB, Rockwell hardness HRC, Vickers hardness HV and so on. 3 elastic limit σ_e: material does not produce permanent deformation can withstand the maximum load stress, single