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本文从断裂力学和电化学两方面叙述在重叠波载荷作用下燃烧室零件的腐蚀疲劳破坏特性,并得出下列主要结论: 1.在重叠波载荷作用下,疲劳和腐蚀疲劳的裂纹扩展速度da/dn可用da/dn=C(△K_(eff))_(mq)~e计算,其中(△K_(eff))_(eq)为当量应力强度因子的有效幅度。2.各种环境状态对铬钼钢和球墨铸铁的有效应力比的影响不显著。3.采用锌阳极和铝阳极的防止腐蚀方法虽能防止铬钼钢腐蚀,但对其裂纹的扩展起明显的加速作用。4.亚硝酸盐是一种既能防止铬钼钢腐蚀,又能抑制其裂纹扩展的较为理想的防腐蚀剂。5.各种环境对球墨铸铁的裂纹扩展速度影响不大。
In this paper, the fatigue failure characteristics of the combustion chamber components under overlapping wave loads are described from the aspects of fracture mechanics and electrochemistry. The main conclusions are drawn as follows: 1. The fatigue crack growth rate under fatigue and fatigue da / dn can be calculated as da / dn = C (ΔK eff) _ (mq) ~ e, where ΔK eff (eq) is the effective amplitude of the equivalent stress intensity factor. The effect of various environmental conditions on the effective stress ratio of chromium-molybdenum steel and ductile iron is insignificant. 3. The use of zinc anode and aluminum anode to prevent corrosion Although the chromium-molybdenum steel to prevent corrosion, but its crack expansion played a significant acceleration. 4. Nitrite is a not only prevent the corrosion of chromium molybdenum steel, but also inhibit the crack growth of the more ideal anti-corrosion agent. 5. A variety of environments on the ductile iron crack propagation speed little effect.