房晓光, 梁晋, 谢锡善, 浦惠康. 缺口对GH33A合金在复杂应力条件下力学行为的影响——高温合金力学冶金(11)[J]. 工程科学学报, 1988, 10(4): 428-433. DOI: 10.13374/j.issn1001-053x.1988.04.025
引用本文: 房晓光, 梁晋, 谢锡善, 浦惠康. 缺口对GH33A合金在复杂应力条件下力学行为的影响——高温合金力学冶金(11)[J]. 工程科学学报, 1988, 10(4): 428-433. DOI: 10.13374/j.issn1001-053x.1988.04.025
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Fang Xiaoguang, Liang Jin, Xie Xishan, Pu Huikang. Notch Effect on Mechanical Behaviour of GH33A Superalloy under Complicated Stress Conditions[J]. Chinese Journal of Engineering, 1988, 10(4): 428-433. DOI: 10.13374/j.issn1001-053x.1988.04.025
Citation: Fang Xiaoguang, Liang Jin, Xie Xishan, Pu Huikang. Notch Effect on Mechanical Behaviour of GH33A Superalloy under Complicated Stress Conditions[J]. Chinese Journal of Engineering, 1988, 10(4): 428-433. DOI: 10.13374/j.issn1001-053x.1988.04.025
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缺口对GH33A合金在复杂应力条件下力学行为的影响——高温合金力学冶金(11)

Notch Effect on Mechanical Behaviour of GH33A Superalloy under Complicated Stress Conditions

    摘要
  • 摘要: 本文研究了缺口对GH33A合金在高温低周疲劳及劳疲/蠕变交互作用下的力学行为。结果表明:缺口使GH33A合金低周疲劳寿命缩短,其缩短的程度随缺口尖锐程度的增加而加剧。低周疲劳高应力时,保载时间的作用引入了蠕变分量,促使低周疲劳寿命Nf降低。在低周疲劳固定最大应力,改变最小应力而造成蠕变/疲劳交互作用情况下,其断裂寿命在一定条件下具有最大值,断裂机制可由纯疲劳断裂逐步转化为纯蠕变断裂,其程度主要决定于蠕变应力(或疲劳应力)分量所占比例的大小。

     

    Abstract: The notch effect on high temperature LCF (Low Cycle Fatigue) and fatigue/creep interaction behaviour was investigated in GH33A super-alloy. LCF life was decreased dramatically because of notch and acuity of notchs. During LCF tests, dwelling at maximum stress introduces creep damage into low cycle fatigue, then decreased LCF fatigue cycles. At LCF tests with constant maximum stress and varied minimun stress, fatigue/creep interaction curve exhibits a maximum fatigue life at certain stress condition and fracture character can be gradually changed from pure fatigue into pure creep with increasing in mean stresses and decreasing in alternating stress amplitudes.

     

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