| 迭加压应力的疲劳蠕变交互作用下的断口分析 |
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| 引用本文： | 杨王玥, 张济山, 陈国良. 迭加压应力的疲劳蠕变交互作用下的断口分析[J]. 工程科学学报, 1990, 12(6): 535-541. DOI: 10.13374/j.issn1001-053x.1990.06.024 |
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| 作者姓名： | 杨王玥 张济山 陈国良 |
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| 摘 要： | 对在700℃,迭加压力过载峰Sp=-196MPa的复杂波形载荷作用下,试样的显微断口形貌进行了分析。由于Sp的作用使得疲劳条纹呈现有规律性的半圆弧形宽间距条纹,借助于它,测得疲劳裂纹扩展速率da/dN与ΔK的关系服从Paris公式;疲劳裂纹Ⅱ阶段与Ⅰ阶段扩展交替出现的形貌证实了:在大应力条件下,裂纹的扩展并不是长裂纹的延伸,而是短裂纹的
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| 关 键 词： | 断口分析 疲劳条纹 疲劳裂纹扩展速率 疲劳蠕变交互作用 |
| 收稿时间： | 1989-09-25 |
Fractography on the Fatigue-creep Interaction under Compressive Overload |
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| Yang Wangyue, Zhang Jishan, Chen Guoliang. Fractography on the Fatigue-creep Interaction under Compressive Overload[J]. Chinese Journal of Engineering, 1990, 12(6): 535-541. DOI: 10.13374/j.issn1001-053x.1990.06.024 |
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| Authors: | Yang Wangyue Zhang Jishan Chen Guoliang |
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| Abstract: | A detailed fractographic analysis was performed on a nickel-based superalloy under complex loading with superimposed compressive peak overload at 700℃. The fatigue cracks were observed to be presented in semicircular striations with relatively wide spacing. The measured fatigue crack growth rate da/dN from the fractography was found to be related to ΔK in the way of paris formula. It also indicated that fatigue cracks were not propagated continuously by extending a long crack but by a successive process of |
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| Keywords: | fractogrsphic analysis fatigue strialions fatigue crack growth rate creep fatigue interaction |
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