Equi-biaxial tension tests on magneto-rheological elastomers
Equi-biaxial tension tests on magneto-rheological elastomers
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DOI：
10.1088/0964-1726/25/1/015015
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发表时间：
2015
影响因子：
4.1
通讯作者：
G. Schubert;P. Harrison
中科院分区：
文献类型：
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作者：
G. Schubert;P. Harrison
设计了一个定制的试验台，以便于使用标准通用试验机在等双轴拉伸下测试磁流变（MR）弹性体（MRE）。在有和没有施加外部磁场的情况下，对各向同性和各向异性MRE进行了高达10%应变的测试。关于材料响应的假设被用来分析两个拉伸方向的应力-应变结果。这些假设已经通过单轴拉伸试验和使用商业多物理场有限元软件进行的磁通量分布模拟进行了验证。MR效应被定义为在给定应变下切线模量的增加，已被研究与工程应变。后者在实验中使用数字图像相关系统进行光学测量。相对MR效应高达74%时，发现各向异性MRE的颗粒排列方向平行于所施加的磁感应强度仅为67.5 mT。
A bespoke test rig has been designed to facilitate testing of magneto-rheological (MR) elastomers (MREs) under equi-biaxial tension using a standard universal test machine. Tests were performed up to 10% strain on both isotropic and anisotropic MREs with and without the application of an external magnetic field. Assumptions regarding the material’s response were used to analyse stress–strain results in the two stretching directions. The assumptions have been verified previously by uniaxial tension tests and by simulations of the magnetic flux distribution performed using a commercial multi-physics finite element software. The MR effect, which is defined as the increase in tangent modulus at a given strain, has been studied versus engineering strain. The latter was measured optically in the experiments using a digital image correlation system. Relative MR effects up to 74% were found when the particle alignment of anisotropic MREs was oriented parallel to an applied magnetic induction of just 67.5 mT.