失效分析与预防
失效分析與預防
실효분석여예방
FAILURE ANALYSIS AND PREVENTION
2014年
2期
115-120
,共6页
邓承佯%徐环宇%王学强%黄鑫%陈里根
鄧承佯%徐環宇%王學彊%黃鑫%陳裏根
산승양%서배우%왕학강%황흠%진리근
水平安定面%后梁中段%应力腐蚀裂纹%LD5合金%防护措施
水平安定麵%後樑中段%應力腐蝕裂紋%LD5閤金%防護措施
수평안정면%후량중단%응력부식렬문%LD5합금%방호조시
horizontal stabilizer%intermediate section of rear beam%stress corrosion cracking%LD5 aluminum alloy%protective measures
针对飞机水平安定面后梁中段裂纹和腐蚀问题,结合产品设计及制造工艺,采用断口显微分析、金相检验、硬度检测以及能谱分析等方法对该段裂纹形成的原因。结果发现:后梁中段裂纹性质为应力腐蚀裂纹,裂纹断口上存在的氯化物和硫化物为主的腐蚀产物;后梁中段在制造过程中表面防护层均有不同程度破损,LD5合金在富含Cl-的环境中经残余应力及工作应力的综合作用产生了应力腐蚀开裂。针对产生裂纹和腐蚀的各种因素,提出了切实有效的治理措施,将使该型飞机水平安定面后梁中段连接和防护状态更趋完善,保障机体寿命。
針對飛機水平安定麵後樑中段裂紋和腐蝕問題,結閤產品設計及製造工藝,採用斷口顯微分析、金相檢驗、硬度檢測以及能譜分析等方法對該段裂紋形成的原因。結果髮現:後樑中段裂紋性質為應力腐蝕裂紋,裂紋斷口上存在的氯化物和硫化物為主的腐蝕產物;後樑中段在製造過程中錶麵防護層均有不同程度破損,LD5閤金在富含Cl-的環境中經殘餘應力及工作應力的綜閤作用產生瞭應力腐蝕開裂。針對產生裂紋和腐蝕的各種因素,提齣瞭切實有效的治理措施,將使該型飛機水平安定麵後樑中段連接和防護狀態更趨完善,保障機體壽命。
침대비궤수평안정면후량중단렬문화부식문제,결합산품설계급제조공예,채용단구현미분석、금상검험、경도검측이급능보분석등방법대해단렬문형성적원인。결과발현:후량중단렬문성질위응력부식렬문,렬문단구상존재적록화물화류화물위주적부식산물;후량중단재제조과정중표면방호층균유불동정도파손,LD5합금재부함Cl-적배경중경잔여응력급공작응력적종합작용산생료응력부식개렬。침대산생렬문화부식적각충인소,제출료절실유효적치리조시,장사해형비궤수평안정면후량중단련접화방호상태경추완선,보장궤체수명。
The intermediate section of the rear beam of an aircraft horizontal stabilizer was found to have cracks and corrosion after service for a while. The cause for the cracking was analyzed by macro and micro observation, metallographic examination, hardness testing, energy spectrum analysis as well as analyzing product design and manufacturing processes. The results show that the cracking mode is stress corrosion cracking. Sulfide and chloride corrosion products were found at the cracking fracture surface. The surface protection layer had been damaged during manufacturing process. The co-effect of residual stress and working stress resulted in the cracking of the LD5 aluminum alloy during service in the Cl-rich environment. Taking various factors of cracks and corrosion into consideration, several practical and effective measures were put forward to prevent this kind of failure and prolong the life of the aircraft body.