根据断裂力学基本原理,尝试建立了裂纹扩展方向与材料微观组织参数之间的关系模型,旨在指导头螺新成形工艺的制定,在满足头螺开舱......

Anew method in system design of ejecting devices of missiles is first presented.Some important points are dis-cussed,whi......