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An Analytic Investigation of "Hot-Spot" Formation in Compressible Energetic Materials

Li X., Zhao F., Liu J.

Central European Journal of Energetic Materials

2017

Vol. 14, no. 4

806--820

In this paper, the formation of the shock-induced “hot-spot” in compressible energetic materials has been analyzed. By applying the compressible elastic-viscoplastic material model to a hollow sphere, and solving the governing equations with the initial and boundary conditions, this paper proposes an analytic pore collapse model that is able to simulate the viscoplastic deformation which determines the formation of a “hot-spot”. In this new model there are three mechanisms, of which instantaneous deformation and the subsequent quasi-static incompressible deformation dominate “hot-spot” formation, while quasi-static compressible deformation is of little effect. In comparison with the incompressible solution, this model demonstrates that the bulk compressibility has a great influence on “hot-spot” formation, as the degree of the “hot-spot” reaction is a positive quasi-linear function of Poisson’s ratio ν. An error in Kim’s original pore collapse model has also been discussed.

Miękkość bibułek tissue oraz jej pomiar

Skowroński J. W.

Przegląd Papierniczy

2010

R. 66, nr 8

463-465

Miękkość bibułki tissue jest jedną z najbardziej pożądanych właściwości. Jej pomiar jest bardzo trudny. W związku z tym, zaistniała potrzeba opracowania aparatu mierzącego miękkość bibułki tissue wyrażającego wyniki w skali panelu. Spełniając tę potrzebę skonstruowano Tissue Softness Analyzer (TSA), który został opisany w tej publikacji.

Tissue softness is one of the most consumerdesired paper properties. It is believed that the sensation of softness is influenced by surface and bulk softness but its determination is very difficult. Consequently, there was a strong desire for new tissue softness tester as a single testing instrument expressing its results in panel's scale. To fulfill that desire new apparatus Tissue Softness Analyzer (TSA) was developed and is verified in this publication.