,Fatigue life of machined components

来源 :先进制造进展(英文版) | 被引量 : 0次 | 上传用户:liu_tangdanhua
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
A correlation between machining process and fatigue strength of machined components clearly exists.However,a complete picture of the knowledge on this is not readily available for practical applications.This study addresses this issue by investigating the effects of machining methods on fatigue life of commonly used materials,such as titanium alloys,steel,aluminium alloys and nickel alloys from previous literature.Effects of tuing,milling,grinding and different non-conventional machining processes on fatigue strength of above-mentioned materials have been investigated in detail with correlated information.It is found that the effect of materials is not significant except steel in which phase change causes volume expansion,resulting in compressive/tensile residual stresses based onthe amounts of white layers.It is very complex to identify the influence of surface roughness on the fatigue strength of machined components in the presence of residual stresses.The polishing process improves the surface roughness,but removes the surface layers that contain compressive residual stresses to decrease the fatigue strength of polished specimens.The compressive and tensile residual stresses improve and reduce fatigue strength,respectively.Grinding process induces tensile residual stresses on the machined surfaces due to high temperature generation.On the other hand,milling and tuing processes induce compressive residual stresses.High temperature non-conventional machining generates a network of microcracks on the surfaces in addition to tensile residual stresses to subsequently reduce fatigue strength of machined components.Embedded grits of abrasive water jet machining degrade the fatigue performance of components machined by this method.
其他文献
伟大的时代创造伟大的工程。伟大的工程反映伟大的时代。在我们祖国的社会主义建设事业中,不乏这样的大工程。每当一项宏伟的工程竣工之际,记者、作家、美术家、作曲家常常
商贸流通产业作为国民经济的基础性产业,它具有带动系数大、就业机会多、繁荣经济等特点。此外,商贸流通产业是连接生产与消费的中间产业,发展商贸流通业可以很好的促进城乡消费要素市场之间连接,增强城乡产业间的互动,促进城乡在经济、文化等各方面的融合。流通产业在推动城镇化进程中发挥着越来越重要的作用,是中国城镇化进程的重要推动力量。统筹城乡商贸实现城乡商贸流通产业一体化发展对实现城乡统筹发展、建设新型城镇化
2015年11月,中国提出了供给侧结构性改革,其旨在调整经济结构,优化要素配置,进而提高经济质量。在十九大报告中,习近平也强调,坚持“质量第一,效益优先”两大原则,努力实现“更高质量
近年来,房价的波动越来越多受到货币政策的影响,长沙市的房价近几年快速增长,究竟是何种因素造成房价的快速上涨已成为目前关注的热点。目前来看,房产供给结构并不合理,房价不断攀
This paper focuses on the issues of the security of networked control systems by summarizing recent progress in secure control of this research and application
2008年以美国金融危机为导火索的全球金融危机的爆发,给整个世界经济体带来致命打击,包括雷曼兄弟在内的不少美国大金融机构倒闭,全球各大金融市场受到广泛波及,多国政府被迫
In this paper,a predictive sliding mode control method based on multi-sensor fusion is proposed to solve the problem of insufficient accuracy in trajectory trac
最近几年,越来越多的国内外企业开始聘任具有财务工作背景的CEO作为企业的高管。从中国上市公司的具体实践来看,在2000-2013年间,聘请具有财务工作背景CEO的上市公司占总上市公
本文阐明了江苏早稻灌浆结实期阴害大约10年5遇;中、晚稻阴害约10年4~5遇。水稻遭受阴害后,植株体内糖氮比例失调,叶片叶绿素(a+b)含量下降,光合作用受阻,导致结实率和千粒重