关键词: 飞机蒙皮, 拉形, 数值模拟, 静态隐式算法, 机构运动

Abstract: To pre-estimate the formability of complex aircraft skin parts and simulate the whole deformation processes, a finite element simulation system-STRETCHFORM is developed to assist the manufacture according to the stretch-forming feature of skin parts. The system is composed of three function modules—pre-processing, solving and post-processing, and key techniques including motion of mechanism, static implicit algorithm, contact and search algorithm as well as evaluation criterion of forming quality are analyzed and accomplished. Simulation of stretch-forming process for "S" shape skin and air inlet part are carried out, and it demonstrates the good precision and stability in comparison with the results of MARC, PAM-STAMP and experiment.

Key words: aircraft skin, stretch-forming, numerical simulation, static implicit algorithm, motion of mechanism