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Computational Analysis of Dissipative Heating Due to Impact Between a Micro‐Particle Cluster and a Deformable Wall
Author(s) -
Panchadhar Rohan,
Gonthier Keith A.
Publication year - 2008
Publication title -
computer‐aided civil and infrastructure engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.773
H-Index - 82
eISSN - 1467-8667
pISSN - 1093-9687
DOI - 10.1111/j.1467-8667.2007.00535.x
Subject(s) - dissipative system , cluster (spacecraft) , work (physics) , kinetic energy , mechanics , particle (ecology) , dissipation , materials science , discrete element method , classical mechanics , physics , thermodynamics , oceanography , computer science , programming language , geology
Abstract: A combined finite and discrete element method is used to examine the energetics of a micro‐particle cluster that impacts a deformable planar wall. The method combines conservation principles with a penalty based, two‐dimensional (2‐D) distributed potential force algorithm, and an elastic‐viscoplastic and friction constitutive theory, to predict thermomechanical fields within the wall and cluster resulting from both particle‐wall and particle‐particle contact. Emphasis is placed on characterizing the temporal and spatial partitioning of wall and cluster energy for both normal (θ= 0°, where θ is incidence angle) and oblique (θ= 45°) impact. Predictions for an initially close‐packed cluster of well‐resolved particles, each having an initial radius and speed of 50 μ m and 500 m/s, indicate that particles adjacent to the wall experience significant dissipative heating due to plastic and friction work. Frictionally induced temperature rises in excess of 2,000 K are predicted for cluster mass located in the immediate vicinity of sliding contact surfaces, even for normal impact, whereas temperature rises near 200 K are predicted for significantly larger cluster mass due to plastic work. Friction is shown to significantly affect cluster kinetic energy, and to weakly affect its elastic potential energy and plastic work. This analysis highlights the importance of friction as a viable heating mechanism that may trigger combustion of energetic clusters.