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首页> 外文期刊>American journal of applied sciences >Development of Efficient Finite Element Software of Crack Propagation Simulation using Adaptive Mesh Strategy | Science Publications
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Development of Efficient Finite Element Software of Crack Propagation Simulation using Adaptive Mesh Strategy | Science Publications

机译：自适应网格策略的裂纹扩展高效有限元软件开发科学出版物

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> The purpose of this study is on the determination of 2D crack paths and surfaces as well as on the evaluation of the stress intensity factors as a part of the damage tolerant assessment. Problem statement: The evaluation of SIFs and crack tip singular stresses for arbitrary fracture structure are a challenging problem, involving the calculation of the crack path and the crack propagation rates at each step especially under mixed mode loading. Approach: This study was provided a finite element code which produces results comparable to the current available commercial software. Throughout the simulation of crack propagation an automatic adaptive mesh was carried out in the vicinity of the crack front nodes and in the elements which represent the higher stresses distribution. The finite element mesh was generated using the advancing front method. The adaptive remising process carried out based on the posteriori stress error norm scheme to obtain an optimal mesh. The onset criterion of crack propagation was based on the stress intensity factors which provide as the most important parameter that must be accurately estimated. Facilitated by the singular elements, the displacement extrapolation technique is employed to calculate the stress intensity factor. Crack direction is predicted using the maximum circumferential stress theory. The fracture was modeled by the splitting node approach and the trajectory follows the successive linear extensions of each crack increment. The propagation process is driven by Linear Elastic Fracture Mechanics (LEFM) approach with minimum user interaction. Results: In evaluating the accuracy of the estimated stress intensity factors and the crack path predictions, the results were compared with sets of experimental data, benchmark analytical solutions as well as numerical results of other researchers. Conclusion/Recommendations: The assessment indicated that the program was highly reliable to evaluate the stress intensity factors and successfully predicts the cracks trajectories. Based on the results, it was recommended to add further development in the software to simulate crack propagation in elastoplastic materials.
机译： >这项研究的目的是确定2D裂纹的路径和表面，以及评估应力强度因子，作为耐损性评估的一部分。 问题陈述：对于任意断裂结构，SIF和裂纹尖端奇异应力的评估是一个具有挑战性的问题，涉及计算每一步的裂纹路径和裂纹扩展速率，特别是在混合模式载荷下。 方法：本研究提供了一个有限元代码，其结果可与当前的商用软件相媲美。在整个裂纹扩展的模拟过程中，在裂纹前节点附近和代表较高应力分布的单元中进行了自动自适应网格划分。有限元网格是使用超前方法生成的。基于后验应力误差范数方案进行的自适应网格划分过程获得了最佳网格。裂纹扩展的开始准则是基于应力强度因子，该应力强度因子是必须准确估算的最重要参数。受奇异元素的影响，采用位移外推法计算应力强度因子。使用最大圆周应力理论预测裂纹方向。通过分裂节点方法对裂缝建模，并且轨迹遵循每个裂纹增量的连续线性延伸。传播过程由线性弹性断裂力学（LEFM）方法驱动，并且用户交互最少。 结果：在评估估计的应力强度因子和裂缝路径预测的准确性时，将结果与一组实验数据，基准分析解决方案以及其他研究人员的数值结果进行了比较。 结论/建议：评估表明，该程序可高度可靠地评估应力强度因子并成功预测裂纹轨迹。根据结果​​，建议在软件中增加进一步的开发以模拟弹塑性材料中的裂纹扩展。

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