Experimental and Simulation Analysis for the Impact of a Two-Link Chain with Granular Matter

Eliza A Banu,Dan B Marghitu

doi:10.1155/2015/129728

Abstract

The resistance force of the granular matter is modeled as a linear superposition of a static (quadratic depth-dependent) resistance force and a dynamic (quadratic velocity-dependent) frictional force. The impact is defined from the moment the end point of the system comes in contact with the granular matter surface until the vertical linear velocity of the end point is zero. The variables of interest are the final depth at the end of the penetration phase and the stopping time. The results for a two-link kinematic chain with two points of contact were compared to the results obtained by applying the resistance force formulation developed to corresponding CAD simulation models. The results revealed that the final displacement increases with initial velocity, while the stopping time decreases. The sensitivity to the initial velocity was studied and an improvement to the resistance force formulated as a result. A series of expressions are proposed for the resistance force coefficients.

Highlights

Impact with granular matter has been of great interest to researchers for decades, mainly because the material is a conglomeration of discrete solids, it behaves as a fluid until a solid-like behavior becomes established
For the impact of a two-link kinematic system with granular matter, the experiments showed that the system will stop faster with increasing initial velocity but will immerse deeper into the volume
The experimental system settings were utilized for the simulations and a model was created in SolidWorks

Summary

Introduction

Impact with granular matter has been of great interest to researchers for decades, mainly because the material is a conglomeration of discrete solids, it behaves as a fluid until a solid-like behavior becomes established. For example, problems such as avalanches involve the flow of granular matter [1, 2] and a better understanding of their behavior would greatly facilitate those seeking to model the effects of earthquakes [3], meteorite impact cratering, and low-speed impact cratering [4,5,6]. Industrial processes such as mixing, stirring, and drilling would benefit [7, 8]. Others have adopted a slightly different approach by performing their analysis using discrete element methods (DEM) for the same purpose [1, 17, 18]

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