Residual stresses at the surface of automotive suspension springs
Residual stresses at the surface of automotive suspension springs
复制标题
汽车悬架弹簧表面残余应力
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
Michael T. Todinov
中科院分区：
文献类型：
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作者：
Michael T. Todinov
本研究主要探讨汽车硅锰悬架弹簧表面不利应力的来源。在弹簧制造的各个阶段--淬火、回火和喷丸处理--对残余应力进行了研究。淬火产生的残余应力以复杂的方式取决于表面的微观结构状态和淬火弹簧钢丝中的热梯度的变化。与预期相反，油淬脱碳弹簧钢丝会在表面产生拉伸残余应力，而水淬则会产生压缩残余应力。回火后残余应力并未消失。此外，淬火和回火后的喷丸处理，如果不适当地进行，可能会导致在表面处的小的压缩或甚至拉伸残余应力，这严重地降低了悬架弹簧的抗疲劳性。
This study concentrates on the origins of unfavourable stresses at the surface of silicon-manganese automotive suspension springs. The residual stresses have been investigated at the various stages of the spring manufacturing--quenching, tempering and shot peening. Residual stresses from quenching depend in a complex fashion on the microstructural state of the surface and on the variation of the thermal gradient into the quenched spring wire. Contrary to expectations, oil-quenching of decarburised spring wire results in tensile residual stresses at the surface, while water quenching results in compressive residual stresses. The residual stresses do not disappear after tempering. Moreover the shot peening after quenching and tempering, if not conducted properly, may result in small compressive or even tensile residual stresses at the surface, which severely diminishes the fatigue resistance of the suspension springs.