Local Residual Stress near Fatigue Crack Tip
Local Residual Stress near Fatigue Crack Tip
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疲劳裂纹尖端附近的局部残余应力
DOI：
10.2355/isijinternational1966.19.411
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发表时间：
1979
影响因子：
1.8
通讯作者：
Keisuke Tanaka
中科院分区：
文献类型：
--
作者：
S. Taira;Keisuke Tanaka
利用X射线微束衍射技术，用X射线应力测量的新方法测量了Jatigu型裂纹尖端的局部应力。这种方法可以看作是一种改进的方法，它利用变形的全部晶格应变来确定应力值。用此法测得的应力值的精度与用JJ法测得的相同。测量了Jatigu型裂纹扩展过程中裂纹尖端的残余应力分布，并与多次超载进行了对比。在接近J‘OJ处测得的残余应力是压缩的，并在一定距离处逐渐向裂纹尖端倾斜。残余压应力随着超载循环次数的增加而增大。高的残余压应力可能是由于超载循环次数的增加而导致的一个大的延缓扩展的裂纹。本文提出了预测疲劳裂纹扩展速率的理论方法。回肠局部残余应力分布，回肠尖端Jatiglle裂纹。
The LocaL stress lIear the tips oj Jatigue cracks was measured with a new method oj X-ray stress measuremellt utiLizillg the X-ray microbeam diffrac tioll technique. The method can be regarded as an improlJed sillgLe illcidellt allgLe method alld uses illformation all Lattice strain aLollg the whoLe Debye rillg ill order to determille the stress vaLue. The accuracy oj the stress vaLue measured by this method was Joulld to be lIeari)' the same as that oj Si1l 2 <jJ method. The distributioll oj residuaL stress lIear the crack tip was measured Jar the Jatigue crack propagatillg ullder cOllstant ampLitude stress cycLillg ac compallied with severaL cycles oj over-Loads. The residuaL stress measured ill tlze close vicinilJ' oj the crack tip was compressive and graduaLly challged to tellsile at a certain distanceJrom the crack tip. The compressive residuaL stress became higher as the number oj overload cycle ill creased. The high compressive residuaL stress may be res/)ollsibLe Jar a large amoullt oj growth retardatioll oj aJatigue crack due to increasillg lIumbers of over-Load cycles. This /Japer presellts the thoretical melhod to predict the growth rate oj a fatigue crackJrom. i'!lormatioll 011 the LocaL residuaL stress distributioll Ileal' Ihe tips oj Jatiglle cracks.