摘要
对45钢材料在三级应力水平下进行了旋转弯曲疲劳试验,并对疲劳试验后的试样进行了显微硬度试验和拉伸试验,研究了疲劳过程中屈服极限σs、强度极限σb、截面收缩率φ和显微硬度HV的变化规律,探讨了以显微硬度作为材料疲劳损伤检测参量,以实现零件剩余寿命预测的可行性。研究结果表明:疲劳过程中金属材料在循环载荷作用下,其显微硬度先增大、后降低,然后再逐渐增大,而且增大和减小的时间非常接近;材料的屈服极限、截面收缩率均呈逐渐下降的趋势;材料的强度极限比静强度极限略高,强度极限的变化均呈逐渐上升的趋势。依据材料的显微硬度检测结构件的损伤程度,预测材料的剩余寿命是可行的。
First perform the revolving with curving fatigue experiment to 45 steel under three levels of stresses .Next Perform the microhardness test and pulling test on the normalized 45 steel smooth sample .The variance of mechanics performance and micro- hardness of steel 45 have been studied in fatigue process. The result of the test show that the variational regularity of mechanics performance is very good and under different stress level the statistical means of microhardness appear increasing, decreasing and slowly increasing. Have discussed taking micro- hardness as the fatigue damage measuring parameter of metal material, it is feasible that useing micro- hardness detects the remainder-life of the part.
出处
《上海第二工业大学学报》
2006年第1期42-46,共5页
Journal of Shanghai Polytechnic University
关键词
显微硬度
剩余寿命
力学性能
疲劳
micro-hardness
remainder-life
mechanics performance
fatigue
