失效分析与预防
失效分析與預防
실효분석여예방
FAILURE ANALYSIS AND PREVENTION
2014年
4期
218-223
,共6页
胡冀轩%张琦%邓胤%张路根%胡智%刘伟成%郑冬明%汤新文
鬍冀軒%張琦%鄧胤%張路根%鬍智%劉偉成%鄭鼕明%湯新文
호기헌%장기%산윤%장로근%호지%류위성%정동명%탕신문
低周疲劳%磁记忆二维检测%李萨如图形%应力集中
低週疲勞%磁記憶二維檢測%李薩如圖形%應力集中
저주피로%자기억이유검측%리살여도형%응력집중
low fatigue%2D testing of magnetic memory%lissajous%stress concentration
选取不同厚度30CrMnSiNi2A平板缺口试样在0.7σs 应力水平下进行低周疲劳试验,并实施磁记忆二维检测,研究不同厚度、不同循环周次下的磁记忆信号变化规律。研究结果表明:随着循环次数的增加,局部应力集中部位的磁记忆信号特征越来越明显,信号幅值也越来越大,并在裂纹失稳断裂前出现明显的法向分量过零而切向分量具有最大值的特征;法向分量和切向分量微分后合成的李萨如图形的封闭区域大小随循环周次呈现Logistic曲线变化,可定量分析构件疲劳损伤程度。该研究结果可为进一步进行磁记忆二维检测研究提供技术支撑。
選取不同厚度30CrMnSiNi2A平闆缺口試樣在0.7σs 應力水平下進行低週疲勞試驗,併實施磁記憶二維檢測,研究不同厚度、不同循環週次下的磁記憶信號變化規律。研究結果錶明:隨著循環次數的增加,跼部應力集中部位的磁記憶信號特徵越來越明顯,信號幅值也越來越大,併在裂紋失穩斷裂前齣現明顯的法嚮分量過零而切嚮分量具有最大值的特徵;法嚮分量和切嚮分量微分後閤成的李薩如圖形的封閉區域大小隨循環週次呈現Logistic麯線變化,可定量分析構件疲勞損傷程度。該研究結果可為進一步進行磁記憶二維檢測研究提供技術支撐。
선취불동후도30CrMnSiNi2A평판결구시양재0.7σs 응력수평하진행저주피로시험,병실시자기억이유검측,연구불동후도、불동순배주차하적자기억신호변화규률。연구결과표명:수착순배차수적증가,국부응력집중부위적자기억신호특정월래월명현,신호폭치야월래월대,병재렬문실은단렬전출현명현적법향분량과령이절향분량구유최대치적특정;법향분량화절향분량미분후합성적리살여도형적봉폐구역대소수순배주차정현Logistic곡선변화,가정량분석구건피로손상정도。해연구결과가위진일보진행자기억이유검측연구제공기술지탱。
The experiment selects different thickness of the 30CrMnSiNi2A flat notched specimens,which experiment with low cycle fatigue testing under the stress of 0. 7σs level, and conducts a two-dimensional magnetic memory testing, researchs the variation of magnetic memory signal under different cycles and different thickness. The experimental results show that: with the increase of the number of cycles, the characteristics of the magnetic memory signal of local stress concentration become more and more obvious, and the signal amplitude is also growing, the most significant characteristic phenomenon appears before the unstable crack fracture, which the normal component exists zero point, while the tangent component has max. The Logistic curve of the equivalent area of the closed field of the Lissajous synthesized by the differential of the normal and tangent component with cycles was fitting, it can be used to quantitative analysis the degree of fatigue damage. These results will provide technical support for further research on 2D testing of magnetic memory.