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When a metal material separates under stress into two or more unconnected parts, the natural surface exposed at the fracture is called the fracture surface. Fracture surface analysis studies how the metal material failed in this manner, examining material, manufacturing method, shape and service conditions to infer the main cause. Fracture analysis is a systematic discipline; in practice the stress and corrosion environment of the material are the main considerations. In general, the principle of seeking truth from facts and objectivity should be followed, and observation should proceed from macro to micro, from low to high magnification, and from the whole to the part.
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