This paper seeks to evaluate crack propagation properties and residual lives of metallic alloys subjected to fatigue loading at room and high temperatures. Fatigue crack growth tests were performed on Ti-6Al-4V/ELI an...This paper seeks to evaluate crack propagation properties and residual lives of metallic alloys subjected to fatigue loading at room and high temperatures. Fatigue crack growth tests were performed on Ti-6Al-4V/ELI and 7050-T7452 subjected to constant-amplitude and actual randomspectra loading at room temperature of about 25 ℃ and at high temperatures of 250 ℃ and 150 ℃ to determine their crack growth properties and residual lives. The damage mode and mechanisms at high temperature were compared with those at room temperature on the basis of the results of fractographic analysis. Temperature-dependent residual lives under actual random-spectra load history were evaluated based on a modified accumulation damage rule accounting for the load interaction.Good correlation was achieved between the predictions and actual experiments, demonstrating the practical and effective use of the proposed method.展开更多
生命科学文摘数据库(BIOSIS Previews,BP)是著名生物学信息检索工具,是科技人员获取生命科学相关信息的重要资源,同时,它也是有效的研究工具。然而,大多数科研人员及信息用户对它的了解和认识不够深入,使很多功能没有得到充分、有效地...生命科学文摘数据库(BIOSIS Previews,BP)是著名生物学信息检索工具,是科技人员获取生命科学相关信息的重要资源,同时,它也是有效的研究工具。然而,大多数科研人员及信息用户对它的了解和认识不够深入,使很多功能没有得到充分、有效地利用。本文对基于ISI Web of Knowledge新检索平台BP数据库的特点、结构及各种功能进行了详细地描述和系统地介绍。可指导研究人员使用数据库,可帮助信息咨询人员和文检课教师了解数据库。展开更多
基金supported by the National Natural Science Foundation of China (No.51375033)
文摘This paper seeks to evaluate crack propagation properties and residual lives of metallic alloys subjected to fatigue loading at room and high temperatures. Fatigue crack growth tests were performed on Ti-6Al-4V/ELI and 7050-T7452 subjected to constant-amplitude and actual randomspectra loading at room temperature of about 25 ℃ and at high temperatures of 250 ℃ and 150 ℃ to determine their crack growth properties and residual lives. The damage mode and mechanisms at high temperature were compared with those at room temperature on the basis of the results of fractographic analysis. Temperature-dependent residual lives under actual random-spectra load history were evaluated based on a modified accumulation damage rule accounting for the load interaction.Good correlation was achieved between the predictions and actual experiments, demonstrating the practical and effective use of the proposed method.
文摘生命科学文摘数据库(BIOSIS Previews,BP)是著名生物学信息检索工具,是科技人员获取生命科学相关信息的重要资源,同时,它也是有效的研究工具。然而,大多数科研人员及信息用户对它的了解和认识不够深入,使很多功能没有得到充分、有效地利用。本文对基于ISI Web of Knowledge新检索平台BP数据库的特点、结构及各种功能进行了详细地描述和系统地介绍。可指导研究人员使用数据库,可帮助信息咨询人员和文检课教师了解数据库。
