高级检索

探究预制疲劳裂纹载荷对DH36药芯焊丝CO2气保焊接头CTOD值的影响

邓彩艳, 孟庆禹, 王东坡, 龚宝明

邓彩艳, 孟庆禹, 王东坡, 龚宝明. 探究预制疲劳裂纹载荷对DH36药芯焊丝CO2气保焊接头CTOD值的影响[J]. 焊接学报, 2015, 36(4): 66-70.
引用本文: 邓彩艳, 孟庆禹, 王东坡, 龚宝明. 探究预制疲劳裂纹载荷对DH36药芯焊丝CO2气保焊接头CTOD值的影响[J]. 焊接学报, 2015, 36(4): 66-70.
DENG Caiyan, MENG Qingyu, WANG Dongpo, GONG Baoming. Influence of maximum fatigue precracking force on CTOD value of DH36 flux-cored wire CO2 protection welded joints[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2015, 36(4): 66-70.
Citation: DENG Caiyan, MENG Qingyu, WANG Dongpo, GONG Baoming. Influence of maximum fatigue precracking force on CTOD value of DH36 flux-cored wire CO2 protection welded joints[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2015, 36(4): 66-70.

探究预制疲劳裂纹载荷对DH36药芯焊丝CO2气保焊接头CTOD值的影响

基金项目: 天津市自然科学基金资助项目(09JCYBJC05100)

Influence of maximum fatigue precracking force on CTOD value of DH36 flux-cored wire CO2 protection welded joints

  • 摘要: 依据BS7448标准对DH36药芯焊丝气保焊接头进行了裂纹尖端张开位移(crack tip opening displacement,CTOD)试验,通过对接头进行组织、断口分析,同时对预制疲劳裂纹过程进行有限元模拟分析,研究不同预制疲劳裂纹最大载荷对CTOD值的影响.结果表明,预制疲劳裂纹最大载荷对CTOD试验结果影响很大.当预制疲劳裂纹最大载荷远小于BS7448标准规定的最大值时,试验过程易出现突跃,即pop-in现象,从而得到较小的CTOD值;反之,当预制疲劳裂纹最大载荷接近或超过BS7448标准规定的最大值时,pop-in现象减弱、延迟或者消失,得到较大的CTOD值.故而为了保证试验结果的可靠性,标准中应对预制疲劳裂纹载荷敏感的接头更严格的规定其最大值.
    Abstract: CTOD tests were carried out for flux-cored gas protection welded joints of DH36 according to Standard BS7448. The effect of fatigue precracking force on the CTOD value was investigated by analyzing the microstructure and fracture surface of the joint and finite element simulation on the process of fatigue precracking. The results show that the maximum fatigue precracking force has a tremendous influence on CTOD value. When the maximum fatigue precracking force was less than the specified value in Standard BS7448, the test process was prone to pop-in phenomenon, and smaller CTOD value occurred. Conversely, when the maximum fatigue precracking force was close to or exceeding the specified value, the CTOD value would be larger. Thus the Standard should be strictly limited to the maximum fatigue precracking force to ensure the reliability of test results.
  • [1] 王建平,霍立兴,张玉凤,等. pop-in效应对材料断裂韧度的影响及评价[J].机械强度, 2006, 28(2):261-263. Wang Jianping, Huo Lixing, Zhang Yufeng, et al. Influence and assessment of the pop-in effect on material fracture toughness[J]. Journal of Mechanical Strength, 2006, 28(2):261-263.
    [2] BS7448 Part 1& Part 2. Fracture mechanics toughness tests, part 1. Method for determination of KIC, critical CTOD and critical J values of welds in metallic materials[S]. BSI:LSBU Press,1997.
    [3] ISO12135. Metallic materials-Unified method of test for the determination of quasistatic fracture toughness[S]. Internationl Organization for Standardization, 2002.
    [4] 王建平,霍立兴,张玉凤,等. EH36钢埋弧焊接头CTOD试验中的突跃效应及评价[J].焊接学报, 2004, 25(5):80-84. Wang Jianping, Huo Lixing, Zhang Yufeng, et al. Pop-in effect and its assessment in CTOD test for submerged-arc welded joint of steel EH36[J]. Transactions of the China Welding Institution, 2004, 25(5):80-84.
    [5] 吴世品,王东坡,邓彩艳,等.焊缝CTOD试验中的Pop-in效应及产生原因[J].焊接学报, 2012, 33(4):105-108. Wu Shipin, Wang Dongpo, Deng Caiyan, et al. Investigation on Pop-in phenomenon and its causes in CTOD test for weld metal[J]. Transactions of the China Welding Institution, 2012, 33(4):105-108.
    [6] 陈剑虹,王国珍,马杭. C-Mn钢焊缝金属的缺口和裂纹试样的微观断裂行为[J].甘肃工业大学学报, 1991, 17(1):34-40. Chen Jianhong, Wang Gouzhen, Ma Hang. Microscopicfracture behavior of C-Mn steel and weld metals in notched and precracked S-peciments[J]. Journal of Gansu University of Technology, 1991, 17(1):34-40.
    [7] 陈剑虹,王国珍. C-Mn钢焊缝金属韧脆转变微观断裂行为[J].甘肃工业大学学报, 1993, 19(3):1-7. Chen Jianhong, Wang Guozhen. Micro-fracture behavior of C-Mn base and weld steel in the brittle-ductile transition temperature region[J]. Journal of Gansu University of Technology, 1993, 19(3):1-7.
计量
  • 文章访问数:  265
  • HTML全文浏览量:  9
  • PDF下载量:  88
  • 被引次数: 0
出版历程
  • 收稿日期:  2013-04-28

目录

    /

    返回文章
    返回