摘要
针对航空整体结构件的加工变形问题仍停留在表面研究,尚未深入到位错运动学微观层面上,在解决加工变形方面缺乏可靠的理论依据,提出了基于位错理论的整体结构件加工变形与微观位错之间数学关系模型构建方法。根据位错动力学,建立整体结构件加工变形的运动位错分布方程。通过位错密度和Burgers矢量求解滑移变形,建立滑移量与塑性变形的数学关系,以塑性变形为中间变量建立微观位错与整体结构件加工变形数学关系模型。结果表明:整体结构件的加工变形呈上凸变形,最大变形发生在梁中间附近;加工变形量与距离工件表面层不同深度处的应力场大小、位错增殖强度以及工件长度成正比,与工件厚度成反比。
The problem concerning machining distortion of aerospace monolithic components still remains in the surface study, not yet in-depth study in microscopic level of dislocation kinematics, and its distortion theory lacks of reliable theoretical basis in solving the machining distortion. A construction method of mathematical relation model between dislocations and machining distortion of monolithic component is presented based on dislocation theory. According to dislocation dynamics, a distribution equation of mobile dislocations in the process of deformation in monolithic component was established. Slip deformation was solved through dislocation density and Burgers vector, and then the mathematical relationship between slippage and plastic deformation was established. Thus the mathematical relation model between dislocations and the machining distortion of monolithic component was established by plastic deformation as intermediate variable. It is shown that the machining distortion of monolithic component is upward embossment, and its maximum deformation occurs near the middle of the beam. The amount of machining distortion is directly proportional to the stress field at different depths of the surface layer, proliferation strength of dislocation and the length of the work piece, and inversely proportional to the thickness of the work piece.
出处
《新型工业化》
2013年第4期77-82,共6页
The Journal of New Industrialization
基金
国家自然科学基金项目(51105216)
关键词
整体结构件
加工变形
位错
数学模型
Monolithic component
Machining distortion
Dislocation
Mathematical model
