Identification of the Strain Rate Parameters for Structural Adhesives
Identification of the Strain Rate Parameters for Structural Adhesives
复制标题
结构粘合剂应变率参数的确定
DOI：
10.1163/156856108x309495
复制
发表时间：
2008
影响因子：
2.3
通讯作者：
J. Vassoler
中科院分区：
文献类型：
--
作者：
E. Fancello;L. Goglio;Laurent Stainier;J. Vassoler
结构粘合剂经常用于应用（主要是在汽车领域），在这些应用中，它们暴露于高应变率的动态载荷下，这可能导致塑性应变。因此，这种塑性行为必须包括在内，并通过有限元模拟正确地再现，例如，预测结构在碰撞条件下的价值。这项工作利用了最近开发的非线性本构模型的一般框架，该框架基于变分公式，其中在每个负载增量时，更新满足最小原则。这个问题是在一般条件下面临的，它对得到本构方程的势进行操作；因此，不同的行为可以通过在势中实现的特定模型来处理。本文描述了这种方法在结构双组分环氧胶粘剂情况下的应用，目的是描述其在不同测试速度下的压缩行为。已利用一套广泛可用的压缩试验数据集（应变率高达103 s−1）来确定电位的参数，并评估模型再现测量结果的能力。
Structural adhesives are frequently used for applications (mostly in the automotive field) in which they are exposed to dynamic loads at high strain rates, that can cause plastic straining. Thus, such plastic behavior must be included and correctly reproduced by finite element simulations, for instance, to predict the worthiness of the structure against crash conditions. This work makes use of a recently developed general framework for non-linear constitutive models, based on a variational formulation in which, at every load increment, the updates satisfy a minimum principle. The problem is faced in general terms, operating on potentials from which the constitutive equations are obtained; thus different behaviors can be treated by the specific models which are implemented in the potentials. This paper describes the application of this approach to the case of a structural bi-component epoxy adhesive, with the aim of describing its behavior under compression at different test velocities. A widely available data set on compression tests (at strain rate up to 103 s−1) has been utilized to identify the parameters of the potentials and to evaluate the capability of the models to reproduce the measurements.