Rate-dependent shear deformation of ductile acrylic adhesive and its constitutive modelling
Rate-dependent shear deformation of ductile acrylic adhesive and its constitutive modelling
复制标题
延性丙烯酸粘合剂的速率相关剪切变形及其本构模型
DOI：
10.1243/095440604774202268
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
F. Yoshida
中科院分区：
文献类型：
--
作者：
M. Takiguchi;S. Izumi;F. Yoshida
近年来，开发了具有高延展性和高强度的新型结构胶粘剂并投放市场。这种高延展性粘合剂通常在其流动应力中具有强的速率敏感性。为了研究丙烯酸粘合剂的速率依赖性变形行为，在室温下以各种十字头速度进行拉伸搭接剪切试验。还进行了应力松弛试验。在拉伸搭接剪切试验中，发现胶粘剂树脂的剪切流动应力随剪切速度的增加而显著增加。在应力松弛试验中，应力在早期迅速下降，并逐渐接近一个渐近应力值。为了描述粘性树脂的这种率相关变形特性，本文提出了粘塑性本构模型。剪切应力-应变响应，以及应力松弛行为，本模型预测与相应的实验结果吻合良好。
Recently, new types of structural adhesive with high ductility, as well as high strength, have been developed and put on the market. Such high ductile adhesives usually have strong rate sensitivity in their flow stress. In order to investigate the rate-dependent deformation behaviour of an acrylic adhesive, tensile lap shear tests were performed at various crosshead speeds at room temperature. Stress relaxation tests were also performed. In the tensile lap shear tests, it was found that the shear flow stress of the adhesive resin increased remarkably with increasing shearing speed. In the stress relaxation tests, the stress decreased rapidly at the early stage, and it gradually approached an asymptotic stress value. In order to describe such rate-dependent deformation characteristics of adhesive resin, a viscoplastic constitutive model is presented in this paper. The shear stress-strain responses, as well as stress relaxation behaviour, predicted by the present model agree well with the corresponding experimental results.