应力波在毛洞周围绕射时的波长-洞径比效应

本文用动力有限元数值模拟法研究了应力波在毛洞周围绕射时的波长-洞径比效应。采用了较普遍的三角形脉冲荷载,对七种波长-洞径比进行了计算分析,获得了比较完整的结果.除得到了洞边动应力集中系数随波长-洞径比变化的完整曲线外,还获得了整个应力场的变化情况,特别是洞周围径向和环向拉伸应力的数值及所出现范围的变化规律,并考察了荷载脉冲上升前沿长度 (从零到峰值)所造成的影响.另外,对两种波长的应力波峰值通过毛洞时所产生的动应力分布与相应的静态情况也作了比较.

Effect of the Ratio Between Wavelength and Diameter of Hole on the Stress Distribution During Passage of a Stress Pulse

This paper has studied the effect of ratio between wavelength and diameter of hole on the stress distribution around hole during passage of a triangular stress pulse by using dynamic finite element code. The computations for seven different ratios between wavelength and diameter of hole have carried out. Besides the complete curve of variations of dynamic stress concentration factors with the ratios the changes of whole stress field around hole were obtained, particularly, the variations of values and distribution regions of radial and tangential tension stresses around hole. In addition, the effect of the length of pulse front (rise from zero to peak) was considered and the comparisons of the stress distributions around hole during that the peaks of two stress pulses of different wavelengths pass a hole with the corresponding static cases have been made.