Role of Internal Stresses on the Incubation Times during Stress Corrosion Cracking

摘要: We have examined the incubation times in two alloys, 7075-T651 aluminum alloy and 4140 steel, as a function of applied K, using published data aqueous environment. The role overloads was compared with results from those without overloads, for given Effect environment (NaCl vs deionized water) also examined. show that constant K test, time increases decreasing K. When single overload cycle applied, increased percent background indicating affected crack tip driving forces. These effects varied changes are analyzed considering one-to-one correspondence between force times. Overloads contributed to compressive residual or internal stresses, thereby affecting force. stresses related plastic zone (PZ) sizes formed before after overloads. effective stress intensity due stress, Kint, is defined shown be PZ size. Similarly, condition initiation expressed Ktotal = Kapp ± Kint ≥ KIscc. A detailed methodology determination outlined.