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现代高性能胶粘剂能够提供一种弹性、韧性和塑性变形的最优化平衡,以满足某些独特领域(如建筑物、建筑、运输与交通行业)的应用需求。仅仅通过实验室(为期几天、几周或几个月)的短期试验很难准确预测胶接接头的长期性能。测试过程是通过模拟胶接接头在实际使用过程中可能遇到的各种老化因素来实现的。通常,胶接接头的最初强度值(如剪切强度与剥离强度等)可从胶粘剂的生产商或文献检索中得到。这些数据对于比较不同的胶粘剂以及考察不同参数(如粘合层厚度、搭接长度、固化条件和表面状态等)的影响是非常有用的。另外,在静态负荷条件下与蠕变和松驰有关的胶粘剂长期力学性能数据则少有报道。由于有机胶粘剂中聚合物网络的特性,其粘弹性-塑性形变行为对时间和温度有很强的依赖性。本文旨在介绍一种用来研究和预测胶接接头的长期蠕变和松弛行为的新方法,为结构型胶粘剂的结构设计和工程应用提供基本数据。
Modern high-performance adhesives provide an optimal balance of elasticity, toughness and plastic deformation to meet the application requirements in some unique areas such as buildings, buildings, transport and transportation. It is difficult to predict the long-term performance of bonded joints simply by short-term tests in the laboratory (days, weeks or months). The testing process is achieved by simulating various aging factors that the adhesive joint may encounter during actual use. In general, the initial strength values (such as shear strength and peel strength) of adhesive joints can be obtained from the manufacturer of the adhesive or from the literature search. These data are useful for comparing different adhesives and examining the effects of different parameters such as adhesive layer thickness, overlap length, curing conditions and surface conditions. In addition, the long-term mechanical properties of adhesives that are associated with creep and relaxation under static loading are poorly reported. Due to the nature of the polymer network in organic adhesives, its viscoelastic-plastic deformation behavior has a strong dependence on time and temperature. This article aims to introduce a new method for studying and predicting the long-term creep and relaxation behavior of cementitious joints, providing basic data for structural design and engineering applications of structural adhesives.