含多条裂纹梁的模态与振动疲劳寿命分析

发布时间：2018-07-03 08:47

本文选题：裂纹梁 + 传递矩阵法　；参考：《振动.测试与诊断》2017年02期

【摘要】：基于Paris公式,提出了一种含多条裂纹梁疲劳寿命预估的方法。在模态分析中,基于传递矩阵方法,利用无质量的弯曲弹簧等效裂纹,提出一种求解含有多条裂纹梁固有振型的方法,分析裂纹数目、裂纹位置、裂纹深度对裂纹梁固有频率的影响。在振动疲劳分析中,研究了在简谐激励作用下裂纹数目对裂纹尖端应力强度因子的影响。通过Paris疲劳裂纹扩展方程和同步分析法,考虑裂纹梁振动与裂纹扩展的相互作用,分析了裂纹数目和裂纹位置对裂纹梁疲劳寿命的影响。结果表明,裂纹数量、裂纹位置和深度对梁的模态参数和疲劳寿命有重要影响。
[Abstract]:Based on Paris formula, a method for predicting fatigue life of beams with multiple cracks is proposed. In modal analysis, based on the transfer matrix method, using the massless equivalent crack of bending spring, a method is proposed to solve the inherent modes of beams with multiple cracks. The number of cracks and the location of cracks are analyzed. The influence of crack depth on the natural frequency of cracked beam. In the vibration fatigue analysis, the effect of the number of cracks on the stress intensity factor at the crack tip under harmonic excitation is studied. Based on Paris fatigue crack growth equation and synchronous analysis, the effects of crack number and crack location on fatigue life of cracked beam are analyzed by considering the interaction between crack beam vibration and crack growth. The results show that the number of cracks, the location and depth of cracks have an important effect on the modal parameters and fatigue life of the beam.
【作者单位】：南京航空航天大学机械结构力学及控制国家重点实验室;
【基金】：江苏高校优势学科建设工程基金资助项目(PAPD)
【分类号】：O346

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