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中国腐蚀与防护学报  1994, Vol. 14 Issue (2): 95-105    
  研究报告 本期目录 | 过刊浏览 |
应力比和频率对GC-4钢CF裂纹扩展特性的影响
路民旭;郑修麟
西北工业大学
EFFECTS OF STRESS RATIO AND LOADING FREQUENCY ON CORROSION FATIGUE CRACK GROWTH BEHAVIOUR FOR GC-4 STEEL
Lu Minxu; Zheng Xiulin(Northwestern Polytechnical University)
全文: PDF(1567 KB)  
摘要: 研究了五种应力比和四种频率对GC-4(40CrMnSiMoVA)钢在35%NaCl中性溶溶液中腐蚀疲劳裂纹扩展(CFCG)特性的影响.结果表明,在高应力比时,CFCG的dα/dt-Kmax曲线存在两个平台区PⅠ和PⅡ,且(da/dt)PⅡ<(da/dt)PⅠ.CFCG的da/dN-△K曲线的平台区起始值面△Kp随频率升高呈幂函数关系而降低.从表面电化学反应动力学、裂尖表面形变动力学以及裂尖材料内部氢的扩散动力学三个方面综合考虑,导出了△KP-f的理论函数关系.该函数关系与CFCG试验数据所显示的函数关系十分一致.
关键词 腐蚀疲劳裂纹扩展应力比载荷频率    
Abstract:Effects of stress ratio at five levels and loading frequency at four levels on corrosion fatigue crack growth(CFCG) behaviour in 3.5% NaCl solution for GC--4(40CrMnSiMoVA) steel were studied experimentally. Test results about stress ratio effect sLow that there are two plateaus, i.e. PⅠ and PⅡ, in da/dt vs Kmax curve for CFCG as R >0.5 and (da/dt)pⅡ<(da/dt)pⅠ but only one plateau exists as R <0.3. The essential causes for the two Plateau phenomena were tentatively explored, but complete theoretical explanation still needs forther investigation. Test results about frequency effect show that values of stress intensity factor amplitude, △Kp, in onset point of plateau in da/dN vs △K curve for CFCG decrease in a power function manner with the increase of frequency. The corresponding theoretical functional expression of △Kp vs f curve was also derived in this paper, based on comprehensive analysis of three respects of surface electrochemical reaction dynamics, crack tip surface deformation dynamics and hydrogen diffusion dynamics in material interior st crack tip. This expression is well consistent with experimental functional relation shin in test data.
Key wordsCorrosion fatigue crack growth    stress ratio    loading frequency
收稿日期: 1994-04-25     
基金资助:国家自然科学基金

引用本文:

路民旭;郑修麟. 应力比和频率对GC-4钢CF裂纹扩展特性的影响[J]. 中国腐蚀与防护学报, 1994, 14(2): 95-105.
. EFFECTS OF STRESS RATIO AND LOADING FREQUENCY ON CORROSION FATIGUE CRACK GROWTH BEHAVIOUR FOR GC-4 STEEL. J Chin Soc Corr Pro, 1994, 14(2): 95-105.

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