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2 Machine Dynamics Problems

2 2008

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Impact of Ggranular Materials on Stress Relaxation Tests Results of Elongated Special Granular Structures

100%

Zalewski R.

tom Vol. 32, No. 2

109-118

In the paper a new material with optional mechanical/rheological properties has been introduced. It is built on the basis of loose grains encapsulated in a hermetic sleeve, where in the next step so called underpressure is generated. This increases internal frictional forces acting between constituent elements (grains) and in the global scale causes stiffening of the granular system. Increasing of internal underpressure value causes non-linear changes in mechanical properties of the system. In this paper basic rheological experimental results are presented and grain's material influence on global physical properties is discussed.

Identification of the Bodner Partom Model for Special Granular Structures : Preliminary Approach

100%

Zalewski R. , Skalski P.

tom Vol. 32, No. 2

119-127

This work deals with new "smart systems" that are based on granular materials. These systems consist of a tight flexible sleeve, which is filled with a granular material. The air is then pumped out of the sleeve, causing underpressure, compressing the granules and so making the system more rigid and changing its damping characteristics. This allows for quick, easy, and inexpensive controls of the damping and stiffness of such systems. The aim of this paper is to present the experimental results of uniaxial tests of a sleeve filled with granular materials. These results support the modeling of such a system filled with a granular material using the Bodner-Partom viscoplastic constitutive law.