High Strain-Rate Compressive Properties and Constitutive Modeling of Bulk Structural Adhesives
High Strain-Rate Compressive Properties and Constitutive Modeling of Bulk Structural Adhesives
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块体结构粘合剂的高应变率压缩性能和本构模型
DOI：
10.1080/00218464.2012.660813
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
K. Nakai and N. H. Mohd Yatim
中科院分区：
文献类型：
--
作者：
T. Yokoyama;K. Nakai and N. H. Mohd Yatim
本文采用修正的Ramberg-Osgood方程对两种不同的块状结构胶粘剂在10− 3 ~ 103/s应变速率下的本构模型进行了研究。测试了市售的双组分甲基丙烯酸酯结构粘合剂和环氧结构粘合剂。高应变率压缩应力-应变环的两个散装结构胶粘剂确定与传统的分离式霍普金森压杆使用锥形撞击杆。在Instron®测试机中测量静态和中间速率压缩应力-应变曲线。通过使用最小二乘法拟合实验应力-应变数据来确定修改的Ramberg-Osgood方程的五个参数。将修正的Ramberg-Osgood模型预测的三种不同应变率下的压缩应力-应变曲线与实验结果进行了比较。结果表明，用修正的Ramberg-Osgood方程可以成功地预测最大应力下的压缩应力-应变曲线。讨论了修正的Ramberg-Osgood模型的局限性。
The present paper is concerned with constitutive modeling of two different bulk structural adhesives at strain rates from 10−3to 103/s using a modified Ramberg-Osgood equation. Commercially available two-part methacrylate structural adhesive and epoxy structural adhesive were tested. The high strain-rate compressive stress-strain loops for the two bulk structural adhesives were determined with a conventional split Hopkinson pressure bar using a tapered striker bar. Static and intermediate rate compressive stress-strain curves were measured in an Instron® testing machine. The five parameters for the modified Ramberg-Osgood equation were determined by fitting to the experimental stress-strain data using a least-squares fit. The compressive stress-strain curves at three different strain rates predicted from the modified Ramberg-Osgood model were compared with the experimental results. It is shown that the compressive stress-strain curves up to the maximum stress can successfully be predicted by the modified Ramberg-Osgood equation. The limitations of the modified Ramberg-Osgood model were discussed.
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