Numerical Analysis Of The Influence Of Abrasive
Grain Geometry And Cutting Angle On States Of
Strain And Stress In The Surface Layer Of Object
Author(s)
L. Kukielka & J. Chodor
Abstract
Grinding is a very complicated technological process. To increase the quality of
the product and minimize the cost of abrasive machining, we should know the
physical phenomena which exist during the process. The first step to the solution
of this problem is an analysis of a machining process with a single abrasive
grain. In the papers [Kukielka and Kustra, Surface Treatment VI Computation
Methods and Experimental Measurements for Surface Treatment Effects. WIT
Press, 2003, pp.109–118; Kukielka et al, Computer Methods and Experimental
Measurements for Surface Effects and Contact Mechanics VII. WIT Press, 2005,
pp. 57–66.] the thermo-mechanical models of this process are presented, but in
this work attention is drawn to the chip formation and its separation from the
object. The influence of the tool geometry and the cutting angle on the states of
strain and stress in the surface layer during machining is explained. The
phenomena on a typical incremental step were described using a step-by-step
incremental procedure, with an updated Lagrangian formulation. Then, the finite
elements methods (FEM) and the dynamic explicit method (DEM) were used to
obtain the solution. The application was developed in the ANSYS system, which
makes possible a complex time analysis of the physical phenomena: states of
displacements, strains and stresses. Numerical computations of the strain have
been conducted with the use of two methodologies. The first one requires an
introduction of boundary conditions for displacements in the contact area
determined in the modeling investigation, while the second – a proper definition
of the contact zone through the introduction of finite elements of TARGET and
CONTACT types, without the necessity to introduce boundary conditions.
Examples of calculations for the strain and stress field in the surface layer zones
of object were presented.
Keywords: abrasive grain, single-grain machining, chip creation, yield stress,
FEM, numerical analysis, state of strain, state of stress.
Keywords
abrasive grain, single-grain machining, chip creation, yield stress,
FEM, numerical analysis, state of strain, state of stress.
Related Book
Other papers in this volume
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