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首页> 外文期刊>Fatigue & fracture of engineering materials and structures >Analysis of the stress intensity factor along the thickness: The concept of pivot node on straight crack fronts
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Analysis of the stress intensity factor along the thickness: The concept of pivot node on straight crack fronts

机译：沿厚度方向的应力强度因子分析：直裂纹前沿的枢轴节点概念

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This paper focuses on calculating and analysing the thickness and load level influence on the stress intensity factor distribution along the thickness, both individually and together. The main objective is improving the knowledge about the small region existing near the surface where the stress intensity factor results remain independent of external factor as load level or thickness. It is found that this phenomenon occurs around a pivot node within the crack front (P_1) that presents advantages for the correlation of numerical and experimental studies. The work evaluates the finite element model of an Al 2024-T35 compact tension specimen with no plastic wake effect introduced. The three-dimensional behaviour near the crack front is simulated through numerical analysis with ANSYS code, and J-integral method is used to determinate the curves of K evolution along the thickness. The results are studied according to a series of parameters that characterize the curves. Conclusions are presented on the areas of influence of each factor involved.
机译：本文着重于计算和分析厚度以及载荷水平对沿厚度方向的应力强度因子分布的影响，无论是单独还是一起。主要目的是提高有关表面附近小区域的知识，应力强度因子的结果与表面附近的小区域无关，而外部因素是负载水平或厚度。发现该现象发生在裂纹前沿（P_1）内的枢轴节点周围，这为数值研究和实验研究的相关性提供了优势。这项工作评估了Al 2024-T35紧凑拉伸试样的有限元模型，没有引入塑性唤醒效应。通过ANSYS代码进行数值分析，模拟了裂纹前沿附近的三维行为，并采用J积分法确定了沿厚度方向K演化曲线。根据表征曲线的一系列参数研究结果。提出了有关每个因素影响范围的结论。

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