Stress cracks are sometimes microscopic crack(s) in materials, workpieces and components. They are caused by stresses in the material structure that generate greater forces than the material itself is capable of absorbing. Stress cracks are usually triggered by mechanical effects, high temperature differences or too rapid temperature changes. Chemical changes in the molecular structure of the material or on its surface can also lead to stress cracks. One example of this is stress corrosion cracking. Stress cracks are also often an indication of material fatigue.
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