压力容器
壓力容器
압력용기
2015年
8期
1-6
,共6页
金属磁记忆%管线钢%疲劳损伤%应力集中%磁信号
金屬磁記憶%管線鋼%疲勞損傷%應力集中%磁信號
금속자기억%관선강%피로손상%응력집중%자신호
metal magnetic memory%pipeline steel%fatigue damages%stress concentration%magnetic signal
对预制缺口的 X80管线钢平板试件进行拉－拉疲劳试验和磁记忆信号检测，研究了整个疲劳试验过程中磁记忆信号的变化特征，分析了试件缺陷部位的判定方法，提出了量化试件疲劳损伤程度的特征量。结果表明：未经处理的磁记忆信号法相分量过零点位置与试件预制缺口位置并不吻合，将试件在疲劳加载过程中的磁记忆信号减去与之相对应的初始磁信号，处理后的磁信号过零点位置与试件损伤部位完全对应；磁记忆信号梯度值 K 可有效表征试件应力集中部位；梯度极大值 Kmax随疲劳次数的增加而增大，反映了试件的疲劳损伤程度，在一定程度下可定量分析试件的疲劳寿命。
對預製缺口的 X80管線鋼平闆試件進行拉－拉疲勞試驗和磁記憶信號檢測，研究瞭整箇疲勞試驗過程中磁記憶信號的變化特徵，分析瞭試件缺陷部位的判定方法，提齣瞭量化試件疲勞損傷程度的特徵量。結果錶明：未經處理的磁記憶信號法相分量過零點位置與試件預製缺口位置併不吻閤，將試件在疲勞加載過程中的磁記憶信號減去與之相對應的初始磁信號，處理後的磁信號過零點位置與試件損傷部位完全對應；磁記憶信號梯度值 K 可有效錶徵試件應力集中部位；梯度極大值 Kmax隨疲勞次數的增加而增大，反映瞭試件的疲勞損傷程度，在一定程度下可定量分析試件的疲勞壽命。
대예제결구적 X80관선강평판시건진행랍－랍피로시험화자기억신호검측，연구료정개피로시험과정중자기억신호적변화특정，분석료시건결함부위적판정방법，제출료양화시건피로손상정도적특정량。결과표명：미경처리적자기억신호법상분량과영점위치여시건예제결구위치병불문합，장시건재피로가재과정중적자기억신호감거여지상대응적초시자신호，처리후적자신호과영점위치여시건손상부위완전대응；자기억신호제도치 K 가유효표정시건응력집중부위；제도겁대치 Kmax수피로차수적증가이증대，반영료시건적피로손상정도，재일정정도하가정량분석시건적피로수명。
Tension-tension fatigue tests of prefabricated notched X80 pipeline steel specimens,and metal magnetic memory signals were detected.The variation of magnetic memory signal during the whole fatigue test was investigated.Methods of determining the defective portion of the specimen were analyzed.Provi-ding quantitative degree of fatigue damage of X80 quantities characteristic.The results show that magnetic memory signal components over the zero position is not consistent the specimen position with pre-gap.It is found that the specimen fatigue loading process in magnetic memory signal minus correspondingly initial magnetic signals,magnetic signal processed through the zero position of the specimen corresponds exactly to the site of injury;The gradient of magnetic memory signal maxima K can effectively characterize the specimen stress concentration,which is increasing with the increase of the number of fatigue and reflects the degree of fatigue damage of the specimen.Under some certain it can be analyzed quantitatively fatigue life of the specimen.
