Establishment of the evaluating method for adhesive strength of thick film

本研究旨在建立一种评价厚膜粘接强度的新方法。研究了评价粘结剂与粘结剂表面厚膜界面粘结强度的新方法。主要研究成果如下：(1)设计并研制了一种新型的剥离载荷和剥离长度测试装置。(2)对水泥砂浆表面的FRP衬里膜和不锈钢表面的陶瓷喷射沉积膜进行了剥离试验。通过在剥离试验中测量剥离载荷和剥离长度，得到了临界能量再释放率(GC值)。GC值不受剥离长度和膜厚的影响。因此，GC值可以用来评价厚膜的结合强度。(3)在实际剥离试验中，很难准确地确定剥离长度的值。给出了无需测量剥离长度即可计算临界能量释放率(GC值)的简便方法。在简便的方法中，用剥离载荷和负荷点的位移得到GC值。

The perpose of this study is to establish the new method for evaluating the adhesive strength of thick film. It has been studied to develop new method to evaluate the adhesive strength of interface between adherent and thick film on the surface of adherent.A summary of the obtained results are as followed.(1) New peel test equipment capable of measuring peel load and peel length was designed and manufactured.(2) The peel test for FRP lining films on cement mortar surface and ceramic spray deposit films on stainless steel were carried out. The critical energy rerease rate (Gc value) were obtained by using peel load and peel length mesured during peel test. Gc values were not affected by peel length and thickness of film. Therefore it was cleared that Gc values could be used to evaluate the adhesive strength of thick film.(3) It was difficult to determine accurately the value of peel length in practical peel test. So convenienced method to calculate the critical energy rerease rate (Gc value) without measuring peel length were derived. In convenienced method, Gc value were obtained by using peel load and displacement of load point.