Introduction to Fracture Failure Analysis

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Fracture failure analysis is mainly to find the cause of fracture； Fracture refers to the phenomenon that metal or alloy materials or mechanical products are divided into several parts under the action of force. It is a dynamic change process, including the initiation and expansion of cracks. Fracture failure refers to the failure of mechanical equipment products to complete the functions specified in the original design due to fracture of mechanical components. The types of fracture failure are as follows:: ①Cleavage fracture failure ； ②Dimple fracture failure ； ③Quasi-cleavage fracture failure ； ④fatigue fracture failure ； ⑤creep rupture failure ； ⑥stress corrosion cracking failure ； ⑦Intergranular fracture failure ； ⑧Brittle fracture failure of liquid or solid metals ； ⑨Hydrogen embrittlement fracture failure ； ⑩Slip separation failure, etc. Fracture failure analysis test process When performing fracture failure analysis, you must first understand the failure analysis procedure. Because most mechanical components break and fail during operation, whenever a component breaks and is damaged, it has a very close relationship with other components, the surrounding environment, and operators. When looking for the cause, the main cause of the damage must be found from factors such as design level, material quality, processing status, maintenance status, assembly accuracy, working environment, service conditions and operating methods, and based on the cause, mechanism, type and stage of the damage, analyze and judge and formulate improvement measures. The fracture process is a dynamic process, and it is difficult to directly observe and analyze the fracture. ； The fracture is a static reaction of fracture. If you carefully observe and analyze the fracture, you can find out the cause and mechanism of the fracture. Because the fracture truthfully reflects the entire process of mechanical component fracture, as well as the initiation and propagation process of cracks in mechanical components, fracture analysis is an important means of fracture failure analysis of mechanical components. In order to achieve better analysis results, this analysis method must be supplemented by a series of other inspection methods, such as non-destructive testing, mechanical property testing, metallographic testing, chemical analysis, X-ray analysis, fracture toughness testing, electron spectroscopy analysis, simulation testing, etc. Finally, the results and data of the above analysis and tests are comprehensively analyzed, improvement measures are proposed, and a failure analysis report is written.