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This article in SSSAJ

  1. Vol. 47 No. 5, p. 855-861
     
    Received: Aug 31, 1982
    Published: Sept, 1983


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doi:10.2136/sssaj1983.03615995004700050003x

A Numerical Study of Raindrop Impact Phenomena: The Elastic Deformation Case1

  1. C. Huang,
  2. J. M. Bradford and
  3. J. H. Cushman2

Abstract

Abstract

Understanding the deformation processes of soil material under raindrop impact is a basic step in studying soil resistance against particle detachment by raindrop splash. To simulate the deformation pattern of a solid material under impact, we used the finite difference technique to solve the dynamic equation of linear elasticity. The selected material properties resembled soil media of wide ranges of elasticity. Two types of impact loading were imposed: a steady, uniform load and a simulated raindrop impact load. Materials responded differently under these loading conditions and showed dissimilar deformation patterns. For a material with low modulus of elasticity, a uniform depression was found under steady, uniform load, while a cone-shaped depression was shown under simulated raindrop impact. The shape of the surface deformation gave us insight into the mechanism of material detachment. The interaction of the lateral jet stream and the obstacles in its course are believed to be the major factor in determining the material detachment. The obstacles can be the sides of the cavity or the irregularities on the granular material itself.

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