Before one moves on to he next topic, consider briefly the other regions observed in the v versus K plots:
1. Threshold region. Although it is difficult to unequivocally establish experimentally that there is a threshold stress intensity Kth below which no crack growth occurs from v versus KI types of curves, probably the most compelling results indicating that it indeed exists come from crack healing studies. At very low values of KI, the driving force for which would be the reduction in surface energy. In other words, a sort of dynamic equilibrium is established, and a threshold results
2. Region2. The hypothesis explaining the weak dependence of crack velocity on K in region2 is that the crack velocity is limited by the rate of arrival of the corroding species at the crack tip.
3. Region3. This stage is not very well understood, but once again a combination of stress and chemical reaction is believed to accelerate the crack.
Before one moves on to he next topic, consider briefly the other regions observed in the v versus K plots:
1. Threshold region. Although it is difficult to unequivocally establish experimentally that there is a threshold stress intensity Kth below which no crack growth occurs from v versus KI types of curves, probably the most compelling results indicating that it indeed exists come from crack healing studies. At very low values of KI, the driving force for which would be the reduction in surface energy. In other words, a sort of dynamic equilibrium is established, and a threshold results
2. Region2. The hypothesis explaining the weak dependence of crack velocity on K in region2 is that the crack velocity is limited by the rate of arrival of the corroding species at the crack tip.
3. Region3. This stage is not very well understood, but once again a combination of stress and chemical reaction is believed to accelerate the crack.
การแปล กรุณารอสักครู่..
Before one moves on to he next topic, consider briefly the other regions observed in the v versus K plots:
1. Threshold region. Although it is difficult to unequivocally establish experimentally that there is a threshold stress intensity Kth below which no crack growth occurs from v versus KI types of curves, probably the most compelling results indicating that it indeed exists come from crack healing studies. At very low values of KI, the driving force for which would be the reduction in surface energy. In other words, a sort of dynamic equilibrium is established, and a threshold results
2. Region2. The hypothesis explaining the weak dependence of crack velocity on K in region2 is that the crack velocity is limited by the rate of arrival of the corroding species at the crack tip.
3. Region3. This stage is not very well understood, but once again a combination of stress and chemical reaction is believed to accelerate the crack.
การแปล กรุณารอสักครู่..