Date of Award
4-1992
Degree Name
Master of Science
Department
Industrial and Entrepreneurial Engineering and Engineering Management
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.
Recommended Citation
Nenawati, Sanjay, "The Indentation of Foam Pattern Surfaces by Coordinate Measuring Machine Probes" (1992). Masters Theses. 854.
https://scholarworks.wmich.edu/masters_theses/854