实验应力分析中的脆性涂层法,是一种全域性的应力分析方法。该方法是将脆性涂料均匀涂刷或喷在试件表面,干燥后形成一层脆性薄膜,当试件受力变形时,由于涂料抗张强度低,垂直于最大拉应力方向产生裂纹。因此,通过实验,可以得到试件的主应力轨迹线。另一方面,根据裂纹区发育的先后顺序,可以确定应力的相对大小。结合标定试验等,还可求出应力值绝对大小。 The brittle coating method in experimental stress analysis is a global stress analysis method. In this method, the brittle coating is evenly painted or sprayed on the surface of the test piece and dried to form a brittle film. When the test piece is subjected to force deformation, cracks occur perpendicular to the direction of maximum tensile stress due to low tensile strength of the paint. Therefore, through experiments, the main stress trajectory of the specimen can be obtained. On the other hand, the relative magnitude of the stress can be determined based on the order of the crack zone development. In combination with calibration tests, the absolute value of the stress value can also be determined.