Experimental Characterization and Modified Constitutive Modeling of the Strain Rate Dependent Compressive Behavior of Adhesives
Experimental Characterization and Modified Constitutive Modeling of the Strain Rate Dependent Compressive Behavior of Adhesives
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DOI：
10.1002/mame.201500415
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发表时间：
2016-02
影响因子：
3.9
通讯作者：
Peifeng Li;Zhiyong Wang
中科院分区：
文献类型：
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作者：
Peifeng Li;Zhiyong Wang
预测胶粘结构的冲击性能需要对动态应变率下胶粘剂的压缩行为进行准确的表征和本构公式。在这项工作中，Sikaflex 粘合剂的应力-应变曲线是在准静态和动态应变率下的单轴压缩测试中测量的。分体式霍普金森压力棒技术采用空心输出棒进行改进，可有效表征粘合剂的动态响应。发现Sikaflex胶粘剂具有不可压缩性和超弹性特性；压缩行为受应变率的显着影响。应变率灵敏度不是恒定的，而是作为应变和应变率的函数而变化。应变率对压缩行为的影响被量化并纳入基于应变能密度的唯象超弹性本构模型中。修改后的本构方程准确地表示了 Sikaflex 粘合剂的应变率相关压缩行为。
Predicting the impact performance of adhesively bonded structures requires the accurate characterization and constitutive formulation of the compressive behavior of the adhesive at dynamic strain rates. In this work, the stress–strain curves of Sikaflex adhesives are measured in uniaxial compression tests at quasi-static and dynamic strain rates. The split-Hopkinson pressure bar technique is modified with the hollow output bar to effectively characterize the dynamic response of the adhesive. It is found that the Sikaflex adhesive is incompressible and hyperelastic; the compressive behavior is significantly influenced by the strain rate. The strain rate sensitivity is not constant but varies as a function of the strain and the strain rate. The strain rate effect on compressive behavior is quantified and incorporated into the phenomenological hyperelastic constitutive model based on strain energy density. The modified constitutive equation accurately represents the strain rate dependent compressive behavior of Sikaflex adhesives.