Date of Award

4-1992

Degree Name

Master of Science

Department

Industrial and Manufacturing Engineering

First Advisor

Dr. Philip J. Guichelaar

Second Advisor

Dr. David M. Lyth

Third Advisor

Dr. Abdolazim Houshyar

Access Setting

Masters Thesis-Open Access

Abstract

When coordinate measuring machines are used to measure the complex shapes of foam patterns, the spherical probe tips indent into the soft surface of the pattern. Such indentation represents a measurement error since the indicated dimension will not be the same as the actual dimension. To determine the magnitude of error, the depth of probe tip indentation into PMMA and EPS foam surface (i.e., elastic indentation) was measured as a function of time, applied load, and foam density. The residual indentation after the removal of the load (i.e., plastic indentation) was also studied.

The depth of elastic indentation increased with an increase in density for EPS patterns and decreased for PMMA patterns. The depth of plastic indentation decreased with an increase in density both for EPS and PMMA patterns. Elastic indentation increased with time whereas plastic indentation decreased with time. Furthermore, molding conditions significantly affect the pattern properties and thus the depth of indentations.

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