Investigation of metal parts damage incidents

basic information

To address damage incidents, it is important to estimate the cause of the accident. Here, we will cover the basic points for investigating damaged items. First, we will understand the condition of the damage. Rust and foreign substances on the fracture surface provide important information for estimating the timing of the damage occurrence. Next, through visual observation of the fracture surface, we will grasp the general situation from the occurrence of cracks to the final fracture. We can roughly determine whether the fracture was caused by excessive load, fatigue, or brittle failure. Following that, to clarify the estimated cause of the damage observed through visual inspection, we will examine the fine details of the fracture surface, confirming the conditions of crack initiation, the type of failure, and the direction of crack propagation. We will also check for the presence of foreign objects or defects at the crack initiation site. Furthermore, if necessary, we will observe the metal structure and measure hardness to confirm whether there are any abnormalities in the material's condition. The mechanisms of metal failure can be classified into ductile failure, brittle failure, intergranular failure, and fatigue failure, with fatigue failure accounting for the majority of damage incidents. Fatigue cracks grow by transitioning from the first stage, where microscopic cracks initiate and propagate, to the second stage, where crack growth is governed by macroscopic mechanical factors, ultimately leading to fracture.

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Investigation of the cause of metal parts damage accidents.