It is possible to investigate the cause of metal parts damage accidents.
When metallic materials fail, the mode of failure changes due to various factors such as the properties of the material, applied stress, and environmental conditions. By observing the fracture surface in detail using an electron microscope, it is possible to identify the cause of the failure to some extent from the fracture morphology. Failure modes can be broadly classified into four categories: ductile fracture, brittle fracture, fatigue fracture, and environmental fracture. Ductile fracture involves significant deformation, such as elongation, before failure occurs. Brittle fracture is characterized by crack propagation at a high speed without plastic deformation. Fatigue fracture occurs when cracks gradually propagate due to repeated stress. Environmental fracture is a failure that is significantly accelerated by corrosive environments, leading to rapid crack propagation.
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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.
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Daitō Analysis Research has been advancing the establishment of an advanced think tank based on highly reliable analysis and analytical techniques accumulated in various material fields, as well as the challenges received from a wide range of industry customers. We aim to solve our customers' various issues with the least cost and the shortest delivery time. Moving forward, we would like to support our customers' research and development using the latest equipment and advanced manpower, and assist in creating products that enrich the future.