The thermal viscoplastic constitutive equation was established by the impact compression and the impact shearing tests by the split Hopkinson pressure bar(SHPB),the process of local plastic instability at higher strain rates was analyzed,the criterion of plastic instability was obtained,and the nature of the high strain rate sensitivity for local plastic instability was revealed.

The results suggest that 20% of moment redistribution at the internal support could be gained in the local buckling design of continuous composite beams with the non compact cross section(class 3).

The analytical results show that failure of members with low slenderness ratio tends to cause local buckling,while failure of members with high slenderness ratio will cause flexural buckling.

The results show that the failure mode of extended endplate connection is the large deformation of bending taking place initially in the tensile zone of endplate and column flange,and then the local buckling of compressive zone in connection causes the loss of carrying load.

The instability includes elastic instability and plastic instability in open-die extrusion.

This paper analyzes the plastic flow and instability of the damaged materials with strain hardening and strain-rate sensitivity under uniaxial tension, and discusses the relationship between the plastic instability and strain to fracture and parameter of material n, m.

The effect of micro-damage on the plastic instability in uniaxial tensile testing has been studied in this paper.

in reference [1],between tearing instability stress and plastic collapse stress under simple loading for circumferential throughwall crack of pipes, a new approximate relation between them under combined loading is established.

In this paper, authors established the approximate relative expression of tearing instability stress and plastic collapse stress under simple loading for circumferential throughwall cracks in pipes.