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首页> 外文会议>AIAA/ASCE/AHS/ASC structures, structural dynamics and materials conference;AIAA SciTech Forum >Fatigue of a Shaft with a Surface Flaw Subject to Cyclic Torsion Loads
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Fatigue of a Shaft with a Surface Flaw Subject to Cyclic Torsion Loads

机译：带有表面缺陷的轴在循环扭转载荷作用下的疲劳

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The damage tolerance methodology for assessing space structures is discussed, and is applied to a shaft subject to cyclic torsional loads. Stress intensity factor solutions for a thumbnail crack were derived for a round bar subject to torsional loads. The virtual crack closure technique was used to extract the Mode II and Mode III stress intensity factors from three-dimensional finite element models of shafts with varying thumbnail flaw sizes. Based on the numerical stress intensity factor data, an empirical equation relating the stress intensity factor to the flaw size was developed. Since no Mode II/Mode III fatigue data was available in the literature for a steel material, an effective stress intensity factor was determined based on the Mode II and Mode III stress intensity factors. Using the effective stress intensity factor and the modified Paris relationship with material coefficients corresponding to Mode I loading for this steel, fatigue predictions were made that were in reasonable agreement with test predictions.
机译：讨论了用于评估空间结构的损伤容限方法，并将其应用于承受周期性扭转载荷的轴。对于承受扭转载荷的圆棒，导出了缩略图裂纹的应力强度因子解。使用虚拟裂纹闭合技术从具有变化的缩略图缺陷尺寸的轴的三维有限元模型中提取模式II和模式III应力强度因子。基于数值应力强度因子数据，建立了将应力强度因子与缺陷尺寸相关联的经验公式。由于文献中没有钢材的模式II /模式III疲劳数据，因此基于模式II和模式III应力强度因子确定了有效的应力强度因子。通过使用有效应力强度因子和修正的Paris关系以及与该钢的I型载荷相对应的材料系数，得出了与试验预测合理吻合的疲劳预测。

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