The development of stretching research is reviewed and the newest achievements obtained recently in systematic method in the fields of stretching process theory,critical tool width ratio and critical blank width ratio are detailed.

Simplified microfabrication technology for producing SU-8 microstructures with high aspect ratio;

Dry etching technique for silicon of high aspect ratio in MEMS device fabrication;

A key problem was analyzed in the electrical discharge machining(EDM) of the high aspect ratio micro-structures.

For plate rolling mill,the influence of slab temperature,head end immersion at biting,use of AGC system,pressure sensor and broadening ratio on oversize in thickness of plate at head and tail ends is analyzed.

Study on the webs ratio of width to thickness of cut T-style steel elements in axial press;

By study of interactive buckling in cut T style steel,considering that its flange is stronger and provide restriction for its web,it is shown that the revised specifications in “Code for Design of Steel Structures”(GB 50017)are more conservative for the ratio of width to thickness in web.

The geometric model of Al_2O_3 grain is designed based on its crystal character,through ran- domly slicing the grain model with a given slenderness ratio with the emulation slicing system,the grain random section parameter-aspect ratio can be gotten.

Gives a formula to evaluate the buckling coefficient of the compressed flange of lipped channel beams by considering the distortional buckling mode, and presents a set of simplified formulae to calculate the limit values of the aspect ratio α for buckling coefficient not less than 4.

The simulation results showed that the fiber aspect ratio was increased while increasing the mass flow of single hole and decreasing the spinning temperature and quenching initial height,but was considerably decreased while increasing the aspect ratio of the spinneret.