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

The elastic instability of a gel cylinder was researched with classical elastic theory.

A new type of tensile curve, which exhibits elasto plastic instability(EPI),stress plateau and unconstant hardening exponent n, has been found at-196 ℃ in metastable material with low stacking fault energy(SFE).

A general static model of the bridges compression members under concentrated transverse loads is set up in simulation of the simple model supporting the Shanley Theory which can satisfactorily explain the behavior of the axially loaded compression member in elasto plastic instability.

Fold catastrophe model of rock dynamic destabilization

Those mainly related to the mechanical properties and its deterioration in EDZ,non-stable subsidence of roof rocks and horizontal squeezing and its coupling effect so as to destabilization,delamination upon deepening rocks at roof induced to the localized dynamic destabilization.

4 centrifugal compressor of Chinese Aluminum Manufacturer Shanxi Branch, this paper provides the distinctions of the methods for diagnosing and Identifying the dynamic destabilization of the seal-gap and the oil-film vibration of the centrifugal compressor, and identifies that the two sides are connected with each other and promoted each other.

Quantitative prediction and comprehensive evaluation on dynamic destabilization of LSMA due to excavation disturbance underneath river;