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航空铝合金弹塑性短疲劳裂纹扩展表征分析
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作者 李旭东 王文秀 +4 位作者 刘元海 孙护国 王玉刚 孔光明 穆志韬 《青岛科技大学学报(自然科学版)》 CAS 2016年第1期87-90,107,共5页
铝合金短裂纹扩展行为与长裂纹扩展行为差别很大,而在铝合金结构中短裂纹阶段占据构件疲劳寿命的90%以上。通过对线弹性裂纹扩展模型进行修正,得到了改进后的弹塑性短裂纹模型,并利用LY12CZ铝合金材料进行验证性实验。结果表明:改进后... 铝合金短裂纹扩展行为与长裂纹扩展行为差别很大,而在铝合金结构中短裂纹阶段占据构件疲劳寿命的90%以上。通过对线弹性裂纹扩展模型进行修正,得到了改进后的弹塑性短裂纹模型,并利用LY12CZ铝合金材料进行验证性实验。结果表明:改进后的模型能够统一表征弹塑性短裂纹和线弹性长裂纹的扩展行为。这拓展了裂纹扩展行为的预测范围,对于铝合金构件的寿命预测和损伤容限评估具有重要的参考价值。 展开更多
关键词 铝合金 弹塑性疲劳短裂纹 裂纹扩展表征 裂纹扩展速率
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航空铝合金材料低温裂纹扩展研究现状与展望 被引量:6
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作者 刘牧东 《航空工程进展》 CSCD 2020年第1期10-19,共10页
铝合金材料由于具有强度高和易加工等优势,已广泛应用于航空工程领域,低温是航空铝合金材料使用中不可避免的环境因素,低温下航空铝合金材料的裂纹扩展行为得到国内外学者和工程界的广泛关注和大量研究。本文综述航空铝合金材料的低温... 铝合金材料由于具有强度高和易加工等优势,已广泛应用于航空工程领域,低温是航空铝合金材料使用中不可避免的环境因素,低温下航空铝合金材料的裂纹扩展行为得到国内外学者和工程界的广泛关注和大量研究。本文综述航空铝合金材料的低温裂纹扩展进展,梳理航空铝合金材料的低温裂纹扩展试验研究状况,归纳低温断裂失效机理,总结低温裂纹扩展模型表征和寿命评估方法,并展望进一步研究方向,为航空铝合金材料工程设计和应用提供帮助。 展开更多
关键词 铝合金 低温 裂纹扩展 模型表征 寿命评估
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Effects of Pitting Corrosion on the Fatigue Behavior of Q235 Steel 被引量:1
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作者 Shanhua Xu Songbo Ren Youde Wang 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2017年第1期81-90,共10页
In order to analyze the distribution and characterizations of corrosion pits on the corroded surface,the steel surface data was measured. Based on the method of the interacting pits,the types of pits corresponding to ... In order to analyze the distribution and characterizations of corrosion pits on the corroded surface,the steel surface data was measured. Based on the method of the interacting pits,the types of pits corresponding to different exposure time were observed and categorized for completely understanding the effects on the fatigue behavior. The results showed that the conditions for estimating whether the pits interfere with each other should not be ignored; exposure time with 2 years was a critical time. The exposure time and the interacting pits can observably reduce the fatigue life of corroded steel. From these conclusions,the method of fatigue crack growth rate with the multi-pits interaction(FCGR-MPI) was developed and used to predict the fatigue behavior of corroded steel affected with the interacting pits. The predicted lives were also well agreed with the experimental results. 展开更多
关键词 pit characterization exposure time pits interaction fatigue crack growth rate predicted life
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Cracking evolution behaviors of lightweight materials based on in situ synchrotron X-ray tomography: A review 被引量:6
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作者 Y. Luo S. C. Wu +1 位作者 Y. N. Hu Y. N. Fu 《Frontiers of Mechanical Engineering》 SCIE CSCD 2018年第4期461-481,共21页
Damage accumulation and failure behaviors are crucial concerns during the design and service of a critical component, leading researchers and engineers to thoroughly identifying the crack evolution. Third-generation s... Damage accumulation and failure behaviors are crucial concerns during the design and service of a critical component, leading researchers and engineers to thoroughly identifying the crack evolution. Third-generation synchrotron radiation X-ray computed microtomo- graphy can be used to detect the inner damage evolution of a large-density material or component. This paper provides a brief review of studying the crack initiation and propagation inside lightweight materials with advanced synchrotron three-dimensional (3D) X-ray imaging, such as aluminum materials. Various damage modes under both static and dynamic loading are elucidated for pure aluminum, aluminum alloy matrix, aluminum alloy metal matrix composite, and aluminum alloy welded joint. For aluminum alloy matrix, metallurgical defects (porosity, void, inclusion, precipitate, etc.) or artificial defects (notch, scratch, pit, etc.) strongly affect the crack initiation and propagation. For aluminum alloy metal matrix composites, the fracture occurs either from the particle debonding or voids at the particle/matrix interface, and the void evolution is closely related with fatigued cycles. For the hybrid laser welded aluminum alloy, fatigue cracks usually initiate from gas pores located at the surface or sub-surface and gradually propagate to a quarter ellipse or a typical semi-ellipse profile. 展开更多
关键词 fatigue crack initiation and growth fatigue damage mechanism damage tolerance defect characterization laser welded aluminum alloys
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