brittle fracture

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This post was last edited by yuanyongan on 2011-10-13 at 13:54. Fragile fracture is a type of fracture in which the component undergoes no significant plastic deformation and develops at an extremely fast rate; it usually occurs suddenly, without any warning signs, and is a very dangerous type of fracture. The probability of such a failure occurring is low, but it can easily lead to severe damage accidents. Fracture under brittle conditions generally occurs before the stress applied reaches the yield strength of the material of the workpiece, with no plastic deformation or only a minimal amount of it on the surface of the workpiece (depending on the operating conditions and the specific dimensions of the components). The microscopic mechanism of brittle fracture is that, when stress is applied to a weak area of the part, microcracks propagate along the grain boundaries (referred to as grain boundary fracture). The growth rate of such microcracks is relatively fast, which can easily lead to the complete fracture of the workpiece. The fracture surface of brittle fracture is crystalline in appearance, often showing a dendritic or radial pattern, with some areas being bright and smooth. This type of fracture is prone to occur in low-temperature environments, under shock conditions, and when brittle materials are used.