航空工程进展
航空工程進展
항공공정진전
ADVANCES IN AERONAUTICAL SCIENCE AND ENGINEERING
2012年
4期
457-462
,共6页
飞机结构%机械连接%紧固件组%钉载分配%有限元
飛機結構%機械連接%緊固件組%釘載分配%有限元
비궤결구%궤계련접%긴고건조%정재분배%유한원
aircraft structure mechanical joint fastener group pin-load distributiom finite element
多钉连接是飞机零部件的常用连接方式，而飞机结构的破坏也多源于这些连接细节，确定各紧固件所传递载荷是连接件强度校核的关键。基于MSC．NASTRAN有限元分析软件，用四种简化模型计算分析单搭接多排钉连接结构的钉载分配，并对其进行对比研究。结果表明：采用cBAR／RBAR／cBusH组合单元模拟紧固件可准确计算钉载，适于飞机结构连接强度分析；与紧固件组钉载分配工程估算方法相比，采用该组合单元有限元方法可有效提高计算精度。
多釘連接是飛機零部件的常用連接方式，而飛機結構的破壞也多源于這些連接細節，確定各緊固件所傳遞載荷是連接件彊度校覈的關鍵。基于MSC．NASTRAN有限元分析軟件，用四種簡化模型計算分析單搭接多排釘連接結構的釘載分配，併對其進行對比研究。結果錶明：採用cBAR／RBAR／cBusH組閤單元模擬緊固件可準確計算釘載，適于飛機結構連接彊度分析；與緊固件組釘載分配工程估算方法相比，採用該組閤單元有限元方法可有效提高計算精度。
다정련접시비궤령부건적상용련접방식，이비궤결구적파배야다원우저사련접세절，학정각긴고건소전체재하시련접건강도교핵적관건。기우MSC．NASTRAN유한원분석연건，용사충간화모형계산분석단탑접다배정련접결구적정재분배，병대기진행대비연구。결과표명：채용cBAR／RBAR／cBusH조합단원모의긴고건가준학계산정재，괄우비궤결구련접강도분석；여긴고건조정재분배공정고산방법상비，채용해조합단원유한원방법가유효제고계산정도。
Pin load computation is crucial for strength analysis since multiple bolted joints is a common connec tion of aircraft parts and aircraft structural damage is mainly caused in these connection details. Four finite ele ment models based on MSC. NASTRAN are carried out to determine the load distribution of a lap joint with multi-bolts in rows. Results show that the modeling method with combination of CBAR, RBAR and CBUSH is convenient, effective and precise, and can be used in multi-fastener aircraft structure analysis. Additionally, an example of eccentrically loaded fastener group is presented and results show that the above modeling method is more accurately for determining pin load distribution than the engineering estimation.
