兰州工业学院学报
蘭州工業學院學報
란주공업학원학보
Journal of Lanzhou Institute of Technology
2014年
6期
65-67
,共3页
何子淑%凌敏%梁益龙
何子淑%凌敏%樑益龍
하자숙%릉민%량익룡
复型技术%镍基高温合金%裂纹形态%高温%疲劳
複型技術%鎳基高溫閤金%裂紋形態%高溫%疲勞
복형기술%얼기고온합금%렬문형태%고온%피로
Reconstrvcted model technique%Nickel-based super-alloy%crack morphology%high temperature%fatigue
采用光滑单边缺口小裂纹试样模拟了多裂纹的扩展情况,利用复型技术和光学显微镜观测了裂纹形态演化全过程,并初步分析了高温疲劳多裂纹的演化规律。结果表明:应力集中条件下的高温疲劳裂纹扩展主要是单裂系统破坏,随着温度升高,裂纹逐渐变为多裂系统;提高应力水平或升高温度,缺口表面典型区域萌生的小裂纹条数都将增多,平均裂纹长度都有所增大。
採用光滑單邊缺口小裂紋試樣模擬瞭多裂紋的擴展情況,利用複型技術和光學顯微鏡觀測瞭裂紋形態縯化全過程,併初步分析瞭高溫疲勞多裂紋的縯化規律。結果錶明:應力集中條件下的高溫疲勞裂紋擴展主要是單裂繫統破壞,隨著溫度升高,裂紋逐漸變為多裂繫統;提高應力水平或升高溫度,缺口錶麵典型區域萌生的小裂紋條數都將增多,平均裂紋長度都有所增大。
채용광활단변결구소렬문시양모의료다렬문적확전정황,이용복형기술화광학현미경관측료렬문형태연화전과정,병초보분석료고온피로다렬문적연화규률。결과표명:응력집중조건하적고온피로렬문확전주요시단렬계통파배,수착온도승고,렬문축점변위다렬계통;제고응력수평혹승고온도,결구표면전형구역맹생적소렬문조수도장증다,평균렬문장도도유소증대。
The small crack of a smooth single-edge notched specimen is adopted to simulate the multi-crack propagation situation.The complex technology and optical microscope are used to observe the whole process of the crack shape evolution.A preliminary analysis of the evolution regularity of high temperature fatigue crack is pres-ented.It turns out that high temperature fatigue crack growth is a destruction of single split system under the con-ditions of stress concentration, and the crack gradually turns into multi-split system with the increasing tempera-ture .The number of small cracks will increase in typical region of the gap surface if the level of stress or tempera-ture is elevated, and the average crack length has increased.