| 焊接接头材料低周疲劳断口的分形分析 |
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| 引用本文： | 倪玉山,程光旭,匡震邦. 焊接接头材料低周疲劳断口的分形分析[J]. 金属学报, 1992, 28(11): 32-39 |
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| 作者姓名： | 倪玉山 程光旭 匡震邦 |
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| 作者单位： | 西安交通大学工程力学研究所，西安交通大学，西安交通大学 博士研究生西安(710049) |
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| 摘 要： | 对16MnR压力容器用钢焊接接头应变控制的低周疲劳试验,运用计算机视觉系统测量疲劳断裂粗糙表面,用二维变差法(Variation Method)计算了断口(焊缝金属和焊接热影响区)的Hausdorff维数,发现其随循环滞回能的增加而降低,焊接热影响区断口的Hausdorff维数的变化比焊缝金属断口的Hausdorff维数变化大;建立了疲劳寿命同Hausdorff维数的关系,说明分形维数愈大疲劳寿命愈长。
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| 关 键 词： | 焊接接头 低周疲劳断口 分形分析 |
| 收稿时间： | 1992-11-18 |
| 修稿时间： | 1992-11-18 |
FRACTAL ANALYSIS OF FRACTURE SURFACE OF WELDING JOINT UNDER LOW CYCLE FATIGUE |
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| NI Yushan,CHENG Guangxu,KUANG Zhenbang. FRACTAL ANALYSIS OF FRACTURE SURFACE OF WELDING JOINT UNDER LOW CYCLE FATIGUE[J]. Acta Metallurgica Sinica, 1992, 28(11): 32-39 |
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| Authors: | NI Yushan CHENG Guangxu KUANG Zhenbang |
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| Affiliation: | Xi'an.iaotong University |
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| Abstract: | Hausdorff dimension of fracture surface roughness of welding joint, both weld metal and heat-affected zone, of pressure vessel steel 16MnR, tested under strain-controlled low-cycle fatigue, was examined with computer vision system and by two-dimensional variation method. Results show that it decreases with the increase of cyclic hysteresis energy. The Hausdorff dimension variation at heat-affected zone is higher than that of weld metal. It is believed that the higher the fractal dimension is, the longer the fatigue life will be. |
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| Keywords: | welding joint low-cycle fatigue fractograph Hausdorff dimension |
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