粉末涂料涂层附着力检测方法与装置研究

【作者】 赵永辉；

【导师】 王威强；

【作者基本信息】 山东大学 ， 化工过程机械， 2005， 硕士

【摘要】 现行涂层附着力检测方法有拉伸法、剪切法、划痕法、压入法等,由于其局限性,对厚涂层检测结果不够理想,目前尚无厚涂层权威评价标准;评价涂层附着力检测方法是否有效现有3个必备条件,文中经过对现有方法的分析研究,又提出了第4个条件,即:涂层试样设计尽可能符合实际涂层的边界条件(即存在一个自由表面),否则不但影响测量的准确度,而且会改变实际涂层应有的破坏模式。 针对粉末涂料涂层的特性以及在实际应用中经常碰到的鼓胀剥离失效形式,文中创新设计了一种厚涂层附着力检测方法—鼓胀剥离检测方法,并设计开发了检测装置。 重点设计了检测装置的整体结构。详细介绍了检测装置各组成系统的功能和仪器仪表选用原则;并对装置的关键零部件进行了严格的设计计算;尤其引用了小变形平板理论来近似计算检测孔上覆盖涂层的厚度和开孔尺寸,该方法既简单、直接,同时也基本满足检测要求。 全面阐述了鼓胀剥离检测方法的试验原理、试验特点、试验步骤、检测功能和数据处理方法。最先引入了线剥离强度和面剥离强度两个附着力性能评价参数,通过建模推导出计算公式,从而给出了附着力检测评价标准。 运用有限元方法对鼓胀剥离检测方法进行了数值模拟分析。具体建立了有限元模型,给出了边界条件和受力条件,求解计算之后,重点对涂层进行了应力分析,通过提取分析结果间接得到涂层剥离半径r和剥离带宽度b等参数,从而代入线剥离强度和面剥离强度计算公式进行计算。 最后设计了一组涂层附着力检测实验。目的是为了验证鼓胀剥离试验检测方法和检测装置的可行性,并说明有限元分析在试验数据分析处理中的重要作用。更多还原

【Abstract】 At present, the main coating test methods are tensile test, shear test, indentation test, scratch test and so on, but due to their limits, these methods are not suitable for the evaluation of the bonding strength between the thick coating layer and the substrate. So far, there isn’t an authority standard to evaluate the thick coating layers’ bonding strength. There are three necessary qualifications to estimate an efficient test now. Having researched current test methods, the fourth qualification was brought forward in this paper, that is, the test sample should be designed to satisfy the practical boundary conditions (namely, there is a free surface on the test sample). Otherwise, not only was the veracity of the measure affected, but also the destroy mode in the practice would be changed.Aiming at the characteristic of the powder coating and the failure form—bulge-peel form ,which usually happens in the practice, a sort of new test method—bulge-peel test and the corresponding equipment were developed in this paper.The entire structure of the test equipment was mainly designed. The functions of each composing system and the selected principles of the apparatus were introduced in detail, and the key parts were designed through calculating strictly. Especially, the dimension of the hole in the sample was calculated approximately through the small-strain-flat theory, which is simple and direct, and can meet the test requirement.The principle, characteristic, function and the data processing method of the bulge-peel test were explained entirely, and two new parameters—the line peel-off intensity and the plane peel-off intensity were firstly introduced to estimate the bonding strength between the thick coating and the substrate. By modeling, the formulas for calculating the line peel-off intensity and the plane peel-off intensity were deduced, and the standard to estimate the bonding strength was put forward.Using finite element software—ANSYS, the bulge-peel test can be analyzed with Finite Element Method (FEM). The finite element model was created and the boundary condition and the force condition were loaded. The bulge-peel test could gain the stress results after solution. By analyzing the list of results, the parameter r—the peel-off ring radius and the parameter b—the peel-off ring width could be confirmed.In order to validate the feasibility of the bulge-peel test and equipment, and explain the important role of FEM during the processing and analyzing the test data, one group of experiments were carried out.更多还原