摘要
航空整体结构件在加工过程中容易发生较大变形。为了研究毛坯的初始残余应力对整体结构件加工变形的影响,采用准耦合方法,利用有限元软件ABAQUS模拟7075铝合金毛坯的淬火过程,研究该过程中温度的变化和残余应力的分布规律,并在含有淬火残余应力的毛坯上进行材料去除模拟。结果表明,模拟产生的比例件的变形与实际加工的比例件的变形非常近似,从而证明了毛坯的初始残余应力是引起整体结构件加工变形的主要因素,同时验证了准耦合淬火模拟的有效性。
Large aviation integrated structure part is prone to distortion during machining. To assess the effect of initial residual stress in blank on the deformation, a quenching analysis of 7075 aluminum alloy is carried out by employing a sequentially coupled thermal and mechanical procedure. The changing temperature and the resultant distribution of residual stress are investigated. The redundant material is removed from the blank which possesses quenched residual stress, and a reduced scale large integrated structure part is obtained. Both the two steps are finished by using finite element code ABAQUS. To testify the finite element result, a reduced scale large integral structure part is machined from a quenched blank. The finite element result is in agreement with the test value. The original residual stress is the main factor to cause deformation, and the reliability of sequentially coupled thermal and mechanical method is also tested.
出处
《航空学报》
EI
CAS
CSCD
北大核心
2004年第4期429-432,共4页
Acta Aeronautica et Astronautica Sinica
基金
国家自然科学基金(50175102)
国防型号工程(00 1810 0785)资助项目
关键词
整体结构件
淬火
残余应力
变形
Aluminum alloys
Deformation
Finite element method
Quenching
Residual stresses
Structures (built objects)
Temperature
