裂纹扩展量是测定裂纹扩展速率的重要参数。而裂纹扩展速率又是估算产品寿命的依据之一。目前,测定裂纹扩展量,一般都采用放大镜、架式显微镜、高速摄影仪等。但是,前者测定精度低,后两种方法操作麻烦。为此,我们自行制造了一台结构简单、使用方便、精度较高的测定裂纹扩展量装置。简介如下。 Crack propagation is an important parameter for measuring crack propagation rate. Crack propagation rate is one of the bases for estimating the life of a product. At present, the measurement of crack growth, generally using a magnifying glass, rack-type microscope, high-speed camera and so on. However, the former has low measurement accuracy and the latter two methods are troublesome to operate. To this end, we have created a simple structure, easy to use, high precision crack extension device. Brief introduction is as follows.