| 焊缝界面对蠕变断裂力学参量的影响 |
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| 引用本文： | 涂善东,巩建鸣,凌祥. 焊缝界面对蠕变断裂力学参量的影响[J]. 焊接学报, 2000, 21(2): 1-5 |
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| 作者姓名： | 涂善东 巩建鸣 凌祥 |
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| 作者单位： | 南京化工大学,南京,210009 |
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| 基金项目： | 中国科学院资助项目，59875039， |
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| 摘 要： | 目前高温断裂力学参量的推定主要是基于材料均匀性的假定，但在工程实际中无法回避由焊接引发的材料不均质问题。在存在焊接界面的情况下，如何得到可靠的高温断裂力学参是以合理描述蠕变裂纹扩展，是结构完整性评价所面临的挑战。作者研究材料性能不匹配对单轴带焊缝试样的应力场及时间相关断裂力学参量的影响，检验了基于加载线位移的Ｃ估算公式适用性。计算表明在大范围蠕变条件下带硬焊缝试样的Ｃ值比单一焊缝金属的Ｃ值高得多。
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| 关 键 词： | 蠕变裂纹扩展 蠕变断裂力学参量 焊缝界面 |
| 收稿时间： | 1999-08-30 |
| 修稿时间： | 1999-08-30 |
Effect of Weld Interface on Time-dependent Fracture Mechanics Parameters |
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| TU Shan-dong,GONG Jian-ming and LING Xiang. Effect of Weld Interface on Time-dependent Fracture Mechanics Parameters[J]. Transactions of The China Welding Institution, 2000, 21(2): 1-5 |
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| Authors: | TU Shan-dong GONG Jian-ming LING Xiang |
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| Affiliation: | Department of Mechanical Engineering, Nanjing University of Chemical Technology, Nanjing, China,Department of Mechanical Engineering, Nanjing University of Chemical Technology, Nanjing, China and Department of Mechanical Engineering, Nanjing University of Chemical Technology, Nanjing, China |
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| Abstract: | The basic assumption in the derivation of the high temperature fracture mechanics parameters is the homogeneity of materials.However,the material inhomogeneity introduced by welding is inevitable in engineering practice.How to charcterize the creep crack growth with appropriate fracture mechanics parameters is rather challenging to the structural integrity assessment in the presence of weld interface.The infouence of material mismatch on the stress field and the time dependent fracture mechanics parameters of uniaxial welded specimens is studied in the present paper.The applicability of conventional C *equation based on the load line displacement is reexamined.It is found that under the extensive creep condition C * value of hard weld/soft parent metal specimen can be significantly higher than that of single weld metal specimen,and the material mismatch has little infouence on C(t ) in small scale creep in the studied cases.It is proposed that the C * formula based on the load line displacement recommended by ASTM E1457 needs to be modificd to interpret the creep crack growth (CCG)behavior of welded specimens. |
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| Keywords: | material mismatch time dependent fracture weld creep crack growth testing standard |
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