失效分析与预防
失效分析與預防
실효분석여예방
Failure Analysis and Prevention
2015年
4期
221-225
,共5页
作动筒接头耳片%损伤容限%渗透检测%断口定量分析%漏检
作動筒接頭耳片%損傷容限%滲透檢測%斷口定量分析%漏檢
작동통접두이편%손상용한%삼투검측%단구정량분석%루검
actuating cylinder joint lug%damage tolerance design%penetration testing%quantitative analysis%missing detection
前起收放作动筒接头耳片损伤容限试验45 000次疲劳循环后,从预制缺口处第一次检测出裂纹,此时裂纹已接近穿透耳片厚度,未能采集到损伤容限数据. 通过外观观察、断口宏微观观察及断口定量分析、金相组织观察、硬度和化学成分检测等手段,对接头耳片进行失效分析,并对检测方案进行改进. 结果表明:接头耳片为疲劳开裂,裂纹萌生寿命为11 717循环周次,在裂纹萌生之后的扩展阶段至少4次渗透漏检;建议后期增加涡流无损检测配合渗透检测或选择在线检测,可有效地完成接头耳片的损伤容限试验.
前起收放作動筒接頭耳片損傷容限試驗45 000次疲勞循環後,從預製缺口處第一次檢測齣裂紋,此時裂紋已接近穿透耳片厚度,未能採集到損傷容限數據. 通過外觀觀察、斷口宏微觀觀察及斷口定量分析、金相組織觀察、硬度和化學成分檢測等手段,對接頭耳片進行失效分析,併對檢測方案進行改進. 結果錶明:接頭耳片為疲勞開裂,裂紋萌生壽命為11 717循環週次,在裂紋萌生之後的擴展階段至少4次滲透漏檢;建議後期增加渦流無損檢測配閤滲透檢測或選擇在線檢測,可有效地完成接頭耳片的損傷容限試驗.
전기수방작동통접두이편손상용한시험45 000차피로순배후,종예제결구처제일차검측출렬문,차시렬문이접근천투이편후도,미능채집도손상용한수거. 통과외관관찰、단구굉미관관찰급단구정량분석、금상조직관찰、경도화화학성분검측등수단,대접두이편진행실효분석,병대검측방안진행개진. 결과표명:접두이편위피로개렬,렬문맹생수명위11 717순배주차,재렬문맹생지후적확전계단지소4차삼투루검;건의후기증가와류무손검측배합삼투검측혹선택재선검측,가유효지완성접두이편적손상용한시험.
A crack was detected at the pre-existing notch of the actuating cylinder joint lug during damage tolerance test after 45 000 cycles. The crack had propagated through the wall thickness, and no effective damage tolerance data were obtained. In the present work, macro and micro observation, and quantitative analysis on fracture surface were carried out. In addition, hardness testing, metallurgical structure examination and chemical composition analysis were also performed. The results show the failure mode of the lug was fatigue cracking, and the crack initiation life was 11 717 cycles. The crack hadn' t been found for at least 4 times during penetration testing. It is suggested that eddy current testing should be added or on-line detection should be applied so that damage tolerance testing can be effectively carried out.
