Fatigue-life prediction methodology using a crack-closure model

Article Abstract:

The plasticity-induced crack closure model gives accurate estimates of small- and large-crack growth rate mechanisms in metallic minerals, under various loading conditions. The model predicts crack-opening stresses as a function of load history and the crack length. A total fatigue model is achieved by using microstructural features of the specimen and correlating the crack growth relations to the effective-stress-intensity factor range under fixed-amplitude loading.

Models, Metals, Metal fatigue, Dynamic testing, Dynamic testing (Engineering)

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Mixed mode fracture toughness of engineering materials

Article Abstract:

Understanding of the impact of mixed mode loading on the fracture toughness of engineering materials involves the use of operative fracture mechanisms and the deformations of the fracture tip. An autocatalytic shear localization-void generation model analyzes the fracture mechanics. Fracture toughness reduces considerably on mixed-mode loading in the materials which fail by stable ductile fractures, induced by second phase particles.

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High temperature fracture toughness in silicon nitride and sialon

Article Abstract:

The investigation of the fracture toughness of HIP-sintered silicon nitride shows that the fracture toughness decreases with an increase in temperature up to 1200 degrees centigrade. In the temperature range from 1200 to 1275 degrees centigrade, a brittle to ductile transition is found. The fracture toughness of sialon increases with a rise in temperature. At 1300 degrees centigrade, sialon's transition of fracture mechanism occurs.

Analysis, Influence, Silicon nitride, Silicon nitrides, High temperatures

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