| 基于紧凑拉伸剪切结构的复合型疲劳裂纹扩展研究 |
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| 引用本文： | 苏少普,曹淑森,廖江海,董登科.基于紧凑拉伸剪切结构的复合型疲劳裂纹扩展研究[J].应用力学学报,2020(1):85-90,I0006. |
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| 作者姓名： | 苏少普 曹淑森 廖江海 董登科 |
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| 作者单位： | 中国飞机强度研究所 |
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| 基金项目： | 航空科学基金(2016ZA23011;20170923001) |
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| 摘 要： | 针对含I-II型复合裂纹的紧凑拉伸剪切(CTS)试样,研究了不同加载角度下的裂纹扩展路径及裂纹扩展寿命,通过实验数据给出了适宜于CTS试样的等效应力强度因子关系式,并基于此提出了一种新的I-II型复合裂纹扩展模型。研究表明,CTS试样的裂纹沿与加载方向近垂直的方向扩展,基于Tanaka公式的等效应力强度因子更适合于本文CTS试件的裂纹扩展寿命评估。当加载角度处于0°~45°之间时,提出的复合型裂纹扩展模型预测误差控制在5.49%之内,验证了分析模型的可行性和准确性。
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| 关 键 词： | 复合型裂纹 紧凑拉伸试件 裂纹扩展模型 等效应力强度因子 |
The mixed-mode fatigue crack growth for compact tension shear structures |
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| Su Shaopu,Cao Shusen,Liao Jianghai,Dong Dengke.The mixed-mode fatigue crack growth for compact tension shear structures[J].Chinese Journal of Applied Mechanics,2020(1):85-90,I0006. |
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| Authors: | Su Shaopu Cao Shusen Liao Jianghai Dong Dengke |
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| Institution: | (AVIC Aircraft Strength Research Institute,710065,Xi’an,China) |
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| Abstract: | The crack growth behavior of Compact Tension Shear(CTS)specimens is studied under different loading modes.A new model for mixed-mode crack growth evaluation is proposed based on experimental results,and the equivalent stress intensity factor is analyzed.It is found that the crack of CTS specimen extends vertically along the loading direction,and Tanaka formula is adequate to calculate the equivalent stress intensity factor for CTS specimens.When the loading angle is in the range of 0°~45°,the error is less than 5.49%,which validates the correctness and feasibility of the new crack growth rate model. |
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| Keywords: | mixed-mode crack compact tensile shear specimen crack growth rate model equivalent stress intensity factor |
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