酚醛—丁腈胶粘剂,五年大气老化试验,拉伸剪切强度试件胶粘剂断口,微观形态可分为两类:第一类是图1显示的韧性断口,在胶粘剂与铝片的界面上,于由搭接接头的端部应力集中,破坏从此开始,沿此界面向中心扩展,最后拉断胶粘剂层、此类剪切破坏是属于粘附破坏,局部伴随有铝试件的表面层破坏。从图1可见凹槽处有粘弹性束状物可能是银纹断面的残痕,其束状物是银纹质,它的形成可能是在丁腈橡胶周围的树脂相上,也可能是在韧性的橡胶相上,丁腈增韧树脂,产生银纹,从而增加了胶粘剂的内聚强度。内聚强度的增加,还可以 Phenolic - nitrile adhesive, five years of atmospheric aging test, tensile shear strength specimen fracture, microscopic morphology can be divided into two categories: the first category is the toughness fracture shown in Figure 1, at the interface of the adhesive and aluminum, At the end of the lap joint, the stress is concentrated and the failure expands to the center along the interface. Finally, the adhesive layer is pulled off. Such shearing damage belongs to the adhesion failure, and the surface layer of the aluminum specimen is partially damaged. It can be seen from Fig. 1 that there is a viscoelastic bundle in the groove, which may be a residual mark on the cross-section of the silver pattern. The shape of the bundle is silver texture, which may be formed on the resin phase around the nitrile rubber, Toughness of the rubber phase, nitrile toughening resin, resulting in silver pattern, thereby increasing the cohesive strength of the adhesive. Cohesive strength increases, you can