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.