Cohesive-force embedded damage model and its application to crack propagation analyses
Cohesive-force embedded damage model and its application to crack propagation analyses
复制标题
内聚力嵌入损伤模型及其在裂纹扩展分析中的应用
DOI：
10.11421/jsces.2016.20160011
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发表时间：
2016
影响因子：
--
通讯作者：
寺田賢二郎
中科院分区：
文献类型：
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作者：
新宅勇一;寺田賢二郎
本研究提出了一种内聚力嵌入损伤模型来实现裂纹的形核和扩展。与现有的弥散裂纹模型和旋转裂纹模型一样，在每个材料点引入裂纹张开，但将其视为隐式确定的内部变量。为了在裂纹扩展分析中使用所提出的损伤模型，提出了嵌套切线割线法 (NTSM) 作为近似切线模量方法的适当替代方法。在验证了所提出的模型在均匀拉伸载荷下的裂纹行为方面与传统的内聚区模型具有相同的性能后，我们证明了该模型在模拟带孔板和受弯曲的梁状结构中裂纹的成核和扩展方面优于传统的内聚区模型。这里还讨论了 NTSM 相对于显式割线法 (ESM) 的优越性。此外，我们还研究了现有的不以裂纹张开作为内部变量的粘性带模型的特点，并以混合模式条件裂纹扩展分析为例指出了它们在历史相关问题中的局限性。
A cohesive-force embedded damage model is proposed in this study to realize both crack nucleation and propagation. As in the existing smeared crack model and rotating crack model, the crack opening is introduced at each material point, but is treated as an internal variable to be determined implicitly. To work with the proposed damage model in crack propagation analyses, the Nested Tangent Secant Method (NTSM) is proposed as a proper alternative to the method with approximate tangent moduli. After verifying that the proposed model provides equivalent performance to the traditional cohesive zone models for cracking behavior under uniform tensile loading, we demonstrate its superiority over them in simulating crack nucleation and propagation in a plate with hole and in a beam-like structure subjected to bending. Here, the superiority of the NTSM over the Explicit Secant Method (ESM) is also discussed. Also, we studied the characteristics of the exiting cohesive zone models that do not have the crack opening as an internal variable and pointed out their limitation in history-dependent problems by taking the mixed-mode condition crack propagation analysis as an example.