Modeling Progressive Failure of Bonded Joints Using a Single Joint Finite Element
Modeling Progressive Failure of Bonded Joints Using a Single Joint Finite Element
复制标题
使用单接头有限元对粘合接头的渐进失效进行建模
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
B. Bednarcyk
中科院分区：
文献类型：
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作者：
S. Stapleton;A. Waas;B. Bednarcyk
增强型有限元是具有嵌入式分析解决方案的元素，可以捕获详细的局部场，从而实现更高效的网格独立有限元分析。在本研究中，一个增强的有限元，被称为粘接接头单元，这是能够模拟一系列的关节类型的开发。使用最小势能原理推导出联合场方程，并将所得的位移场解用于生成单个联合有限元的形状函数和刚度矩阵。因此，该单个有限元捕获了粘接接头内的详细应力和应变场，但它可以在更广泛的结构有限元模型中起作用。因此，可以避免与接合处的细网格相关的成本，同时仍然为接合处提供详细的解决方案。此外，该方法还包括对非线性粘合剂本构行为进行建模的能力，并且可以通过使用基于应变的失效准则对粘合剂的渐进失效进行建模，并在粘合剂失效时对接合处进行建模。该模型的结果与现有的实验和有限元结果进行了比较。
Enhanced finite elements are elements with an embedded analytical solution that can capture detailed local fields, enabling more efficient, mesh-independent finite element analysis. In the present study, an enhanced finite element, referred to as a bonded joint element, that is capable of modeling an array of joint types is developed. The joint field equations are derived using the principle of minimum potential energy, and the resulting solutions for the displacement fields are used to generate shape functions and a stiffness matrix for a single joint finite element. This single finite element thus captures the detailed stress and strain fields within the bonded joint, but it can function within a broader structural finite element model. The costs associated with a fine mesh of the joint can thus be avoided,whilestillobtainingadetailedsolutionforthejoint.Additionally,thecapabilitytomodelnonlinearadhesive constitutivebehaviorhasbeenincludedwithinthemethod,andprogressivefailureoftheadhesivecanbemodeledby using a strain-based failure criteria and resizing the joint as the adhesive fails. Results of the model compare favorably with available experimental and finite element results.