An infinitely-stiff elastic system via a tuned negative-stiffness component stabilized by rotation-produced gyroscopic forces

An elastic system containing a negative-stiffness element tuned to produce positive-infinite system stiffness, although statically unstable as is any such elastic system if unconstrained, is proved to be stabilized by rotation-produced gyroscopic forces at sufficiently high rotation rates. This is accomplished in possibly the simplest model of a composite structure (or solid) containing a negative-stiffness component that exhibits all these features, facilitating a conceptually and mathematically transparent, completely closed-form analysis

An infinitely-stiff elastic system via a tuned negative-stiffness component stabilized by rotation-produced gyroscopic forces

An elastic system containing a negative-stiffness element tuned to produce positive-infinite system stiffness, although statically unstable as is any such elastic system if unconstrained, is proved to be stabilized by rotation-produced gyroscopic forces at sufficiently high rotation rates. This is accomplished in possibly the simplest model of a composite structure (or solid) containing a negative-stiffness component that exhibits all these features, facilitating a conceptually and mathematically transparent, completely closed-form analysis

Constraints on Moving Strong Discontinuity Surfaces in Dynamic Plane-Stress or Plane-Strain Deformations of Stable Elastic- ideally Plastic Materials

For dynamic deformations of compressible elastic-ideally plastic materials in th

Influence of Porosity on Plane Strain Tensile Crack-Tip Stress Fields in Elastic-Plastic Materials: Part ll

This paper continues the investigation of Drugan and Miao (199

Leadership and the Australian Greens

This paper examines the inherent tension between a Green political party’s genesis and official ideology and the conventional forms and practices of party leadership enacted in the vast bulk of other parties, regardless of their place on the ideological spectrum. A rich picture is painted of this ongoing struggle through a case study of the Australian Greens with vivid descriptions presented on organisational leadership issues by Australian state and federal Green members of parliaments. What emerges from the data is the Australian Green MPs’ conundrum in retaining an egalitarian and participatory democracy ethos while seeking to expand their existing frame of leadership to being both more pragmatic and oriented towards active involvement in government