硫化橡胶.疲劳裂缝扩展率的测量

[中文适用范围]： 本国际标准规定了长时间重复加载下硫化橡胶疲劳裂纹扩展速率的测定方法。 裂纹从试验前在试件上切出的切口尖端开始，并逐渐增长，直到最终变得足够大以发生完全断裂。 使用纯剪切试件，进行测量以监测循环载荷下的裂纹扩展，以获得裂纹扩展速率，即每个周期裂纹长度的增加。 通过改变试件中的应变能密度，在不同的撕裂能下进行测试。 这是通过改变应变幅度来完成的。 [外文原描述]： ISO 27727:2008 specifies a method for the determination of the fatigue crack growth rate of vulcanized rubber under repeated loading over an extended period of time. The crack starts from the tip of a cut made in the test piece before the test, and grows progressively until it finally becomes large enough for complete fracture to occur. Using a pure-shear test piece, measurements are made to monitor the crack growth under the cyclic loading in order to obtain the crack growth rate, i.e. the increase in crack length per cycle. Tests are carried out at various tearing energies by varying the strain energy density in the test piece. This is done by changing the strain amplitude.