期刊
FRONTIERS OF MECHANICAL ENGINEERING
卷 13, 期 1, 页码 96-106出版社
HIGHER EDUCATION PRESS
DOI: 10.1007/s11465-018-0498-6
关键词
thermoplastic polyurethane; microcellular injection molding; cavity expansion; compressive strength; hysteresis loss ratio
资金
- Kuo K. and Cindy F. Wang Professorship
- Vilas Distinguished Achievement Professorship
- Wisconsin Distinguished Graduate Fellowship
- 3M Fellowship
- Wisconsin Institute for Discovery
A three-stage molding process involving microcellular injection molding with core retraction and an out-of-mold expansion was developed to manufacture thermoplastic polyurethane into lightweight foams of varying local densities, microstructures, and mechanical properties in the same microcellular injection molded part. Two stages of cavity expansion through sequential core retractions and a third expansion in a separate mold at an elevated temperature were carried out. The densities varied from 0.25 to 0.42 g/cm(3) (77% to 62% weight reduction). The mechanical properties varied as well. Cyclic compressive strengths and hysteresis loss ratios, together with the microstructures, were characterized and reported.
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