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首页> 外文会议>Proceeding of An International Conference the Importance of understanding the fundamentals of the fatigue Process in Counteracting Its Effects in Engineering Components and Structures,and to Reflect on the Contributions of K.J.Miller Sheffield/United >Elastic-plastic concentrations and plastic zones of notched specimens under tensile load
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Elastic-plastic concentrations and plastic zones of notched specimens under tensile load

机译：缺口试样在拉伸载荷下的弹塑性浓度和塑性区

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Investigations of elastic-plastic strain concentrations at notches are important when estimating the fatigue life of notched specimens in the region of 10~3-10~6 cycles.In this paper,the strains ahead of notches in steel plate specimens under tensile load have been investigated using strain gauges.One series of specimens involves two kinds of similar specimens with semi-circular notches.Another series concerns specimens with 120 deg V - notches.From the neasured strains,the strain concentration factor,the strain distribution near the notch root and the plastic zone size were obtained.The strain concentration factors obtained experimentally were compared with values estimated by Neuber's method and by the ASME Code Case N47 method.It has been found that the strain concentration factor depends on the elastic stress concentration factor,the stress level and the notch root radius,and that the strain concentration factor obtained experimentally exceeds the values estimated by the ASME N47 method for cases high stress levels and that the safety margin is dependent on the stress level.It also has been found that strain concentration factors are proportional to the plastic zone size,and that relative strain distributions are almost similar with respect to the relative plastic zone sizes.From the cyclic nature of the strain concentration factor under cyclic tensile load,two kinds of behaviour have been found.
机译：在估计10〜3-10〜6个周期的缺口试样的疲劳寿命时，对缺口处的弹塑性应变浓度进行研究非常重要。使用应变片进行调查。一个系列的样本涉及两种类似的带有半圆形缺口的样本。另一个系列涉及具有120度V形缺口的样本。从牵涉的应变，应变集中系数，缺口根附近的应变分布和将实验获得的应变集中系数与通过Neuber方法和ASME Code Case N47方法估算的值进行比较。已发现，应变集中系数取决于弹性应力集中系数，应力水平和缺口根半径，以及实验获得的应变集中系数超过了ASME N47 m估算的值对于高应力水平和安全裕度取决于应力水平的情况，应该考虑使用。还发现应变集中系数与塑性区大小成正比，相对应变分布相对于相对塑性区几乎相似从应变集中系数在循环拉伸载荷作用下的循环特性，发现了两种行为。

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