P92钢在内压和拉伸组合加载下的蠕变行为
Creep Behavior of P92 Steel Subjected to Combination Loading of Inner Pressure and Tensile
摘 要
采用内压和拉伸组合加载方法，在650℃下对P92钢管状试样进行了不同多轴度的蠕变试验并利用改进的Kachanov-Robatnov蠕变模型对其蠕变行为进行有限元模拟，观察了断口形貌和显微组织，分析了多轴度对P92钢应力分布和损伤发展的影响。结果表明：在内压和拉伸组合加载下，当外壁等效应力相同时，多轴度越大，P92钢的蠕变寿命越短；多轴度对P92钢蠕变孔洞的生长具有促进作用；改进的Kachanov-Robatnov蠕变模型可以准确地描述P92钢的蠕变行为；在蠕变过程中，多轴度影响应力的分布，进而影响损伤的分布，多轴度大的位置其损伤程度也大。
多轴度
蠕变行为
有限元模拟
P92 steel
multiaxiality
creep behavior
finite element simulation
Abstract
Different multiaxial creep experiments were conducted on P92 steel tube samples under combination loading of inner pressure and tensile at 650℃ and the creep behavior was simulated by modified Kachanov-Robatnov creep model. The fracture morphology and microstructure were observed and the influence of multiaxiality on stress distribution and damage evolution of P92 steel was analyzed. The results show that the higher the multiaxiality, the shorter the creep lifetime of P92 steel subjected to combination loading of inner pressure and tensile was when the equivalent stress on the outside of tube was the same. The modified Kachanov-Robatnov creep model could describe the creep behavior of P92 steel accurately. Multiaxiality influenced the stress distribution, and then affected the distribution of damage during creep. The position with the largest multiaxiality had the largest damage.
中图分类号 TG113.25 DOI 10.11973/jxgccl201803014
所属栏目 物理模拟与数值模拟
基金项目 国家自然科学基金资助项目（51134016）；中央高校基本科研业务费专项资金资助项目（2016XS28）
收稿日期 2017/11/23
修改稿日期 2018/2/1
网络出版日期
作者单位点击查看
备注蓝翔(1988-),男,四川内江人,博士研究生
引用该论文: LAN Xiang,XU Hong,LI Mengyang,NI Yongzhong. Creep Behavior of P92 Steel Subjected to Combination Loading of Inner Pressure and Tensile[J]. Materials for mechancial engineering, 2018, 42(3): 74～79
蓝翔,徐鸿,李梦阳,倪永中. P92钢在内压和拉伸组合加载下的蠕变行为[J]. 机械工程材料, 2018, 42(3): 74～79
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【2】姚华堂, 轩福贞, 沈树芳, 等. 高温材料的多轴蠕变试验方法[J]. 机械工程材料, 2008, 32(1): 5-9.
【3】JIANG Y P, GUO W L, YUE Z F. On the study of the creep damage development in circumferential notch specimens[J]. Computational Materials Science, 2007,38(4):653-659.
【4】NI Y Z, LAN X, XU H, et al. Finite element analysis and experimental research on notched strengthening effect of P92 steel[J]. Materials at High Temperatures, 2014, 31(2):185-190.
【5】GOYAL S, LAHA K. Creep life prediction of 9Cr-1Mo steel under multiaxial state of stress[J]. Materials Science & Engineering A, 2014, 615:348-360.
【6】常愿,徐鸿,蓝翔. P92钢多轴蠕变本构模型的建立及验证[J]. 机械工程材料, 2017, 41(2): 112-118.
【7】WANG L Q, WANG J G, WANG H Y, et al. Interaction of fatigue and creep of GH33 under multi-axial stress at high temperature[J]. Journal of University of Science and Technology Beijing, 2003, 10(2):79-80.
【8】SELIGER P, GAMPE U. Life assessment of creep exposed components, new challenges for condition monitoring of 9Cr steels[J]. OMMI, 2002, 1(2): 2-14.
【9】YAO H T, XUAN F Z, WANG Z D, et al. A review of creep analysis and design under multi-axial stress states[J]. Nuclear Engineering and Design 2007, 237(18):1969-1986.
【10】HYDE T H, XIA L, BECKER A A. Prediction of creep failure in aeroengine materials under multi-axial stress states[J]. International Journal of Mechanical Sciences, 1996, 38(4):385-403.
【11】GOODALL I W, SKELTON R P. The importance of multiaxial stress in creep deformation and rupture[J]. Fatigue & Fracture of Engineering Materials & Structures, 2004, 27(4): 267-272.
【12】RABOTNOV Y N.Creep problems in structural members[M].Amsterdam:North-Holland Publishing Company,1969.
【13】倪永中, 蓝翔. 一种用于P92钢寿命预测的蠕变模型研究[J]. 应用力学学报, 2014(6): 978-982.
【14】WEBSTER G A, NIKBIN K M, BIGLARI F. Finite element analysis of notched bar skeletal point stresses and dimension changes due to creep[J]. Fatigue & Fracture of Engineering Materials & Structures, 2004, 27(4):297-303.
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