Environmental cracking under mixed-mode conditions

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Crack growth criteria under coupled environmental and mixed-mode loading conditions are developed. They are based on the physical assumption that crack propagation occurs in the direction of maximum concentration of the corrosive species. Crack growth begins when the concentration reaches a critical value at a specific distance ahead of the crack tip and the subcritical crack velocity also depends on this critical concentration. Power law relations between the external pressures (threshold conditions) or crack velocities (kinetic conditions) and the sum of the squares of the two stress intensity factors governing the structure of stress field in the vicinity of the crack tip are established. The concept of the critical stress-concentration intensity factor is discussed for threshold conditions, and the crack path is determined for kinetic conditions. © 1986.

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Engineering Fracture Mechanics