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第一章 1.什么是金属材料的力学性能?根据不同载荷形式的不同,力学性能主要包括哪些性能指标? 2.什么是强度?什么是塑性?衡量这两种性能的指标有那些?各用什么符号表示? 3.低碳钢做成的d0 = 10mm的圆形短试样经拉伸试验,得到如下数据: Fs = 21100N, Fb = 34500N, l1 = 65mm, d1 = 6mm。 试求低碳钢的 σs、σb、δ5、ψ。 1-4 什么是硬度? HBW、HRA、HRB、HRC各代表什么方法测出的硬度? 1-5 下列硬度要求和写法是否正确? HBW150 HRC40N HR00 HRB10 478HV HRA79 474HBW 1-6 什么是冲击? AK 和αKV 各代表什么? 1-7 什么是疲劳现象? 什么是疲劳强度? 1-8 用标准试样测得的金属材料的力学性能能否直接代表材料制成零件的力学性能? 为什么?
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