The Plane Stress Crack-Tip Field for an Incompressible Rubber Material

The crack-tip field under plane stress condition for an incompressible rubbermaterial￣[1] is investigated by. the use of the fully nonlinear equilibrium theory. It isfound thai the crack-tip field is composed of two shrink sectors and one expansion se-ctor. At the crack-tip, stress and strain possess the singularity of R￣(-1) and R￣(-1n), respec-tively, (R is the distance to the crack-tip before deformation, n is the material const-ant). When the crack-tip is approached, the thickness of the sheet shrinks to zerowith the order of R￣(1.4n). The results obtained in this paper are consistent with that ob-tained in [8] when s→∞ .

某些药品制剂企业洁净区现状及改进策略

根据GMP改造和运行管理的实践,从使用者的角度,以厂房建设和洁净区的运行实际为基础,总结、分析了目前一些中小企业药品制剂生产的洁净工程建设和运行管理的现状,找出其设计和运行中存在的差距和不足,提出了适合制剂中小药品制剂企业建造和运行的建议。