Methods Anterior longitudinal ligament of C1-C4?C4-T1 segments was obtained from 8 fresh Chinese cadavers to test their tensile strength using Shimadzu AUTOGRAPH electronic universal testing machine.

Computer simulation and optimization designs on front rails of automobile in low speed collision;

Study on low velocity crashworthiness simulation of automobile front rails;

This article used HyperMesh and LS-DYNA has carried on the value simulation to the thin-wall straight beam frontage hit process,its result can be used into optimizing design of the front rails,and improve the vehicles structure in further,also make the collision accident create the loss to fell lowly,and provide certain reference on the automobile collision.

Analysis on energy absorption of front rail structure in the course of collision;

A method of redesigning the front rail using tailor-welded blanks was studied,in order to reduce the weight of front rail and enhance its crashworthiness on conditions of satisfying strength and stiffness requirements.

Results The tumors in all cases appeared as anterior mediastinal tumor,among them,the tumors in six cases grew at anterior mediastinum bilaterally and in five cases at one-side.