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探索用柔度法测定小口径锆—4合金管低周疲劳裂纹的等效扩展量。已建立了液压疲劳实验装置,采用COD规监控裂纹向深度的扩展运动,记录低周疲劳裂纹的传播过程。实验证实,通过柔度标定曲线可以间接地预测在低周液压下表面裂纹沿深度的扩属量,并由此估算出裂纹扩展速率。实验指出,低周液压下的断裂特征与循环次数有关,随循环次数的增多,逐渐由爆破过渡到泄漏。
Exploring the Equivalent Expansion Quantity of Low Cycle Fatigue Crack in Small Diameter Zirconium - 4 Alloy Pipe by Flexibility. Hydraulic fatigue test device has been established, the use of COD gauge to monitor the expansion of the depth of the movement to record low-cycle fatigue crack propagation process. Experiments confirmed that the compliance curve can indirectly predict the depth of the surface crack under the low hydraulic pressure along the expansion of the amount of possession, and thus estimate the crack growth rate. Experiments show that the fracture characteristics of the low-cycle hydraulic pressure are related to the number of cycles, with the increase of the number of cycles, gradually from blasting to leakage.