Dynamic Impact Response Behavior of Polymeric Materials
Abstract
The work reported was devoted to making reliable, quantitative impact pulse measurements for free-flight encounters between a spherical projectile and the desired target material. The materials of interest continue to be polycarbonate PC, polymethylmethacrylate PMMA, and epoxy resins. Inorganic glass was also used as a target material because impacts can be confidently modeled from theory in this case. Impact pulse determinations were made on the four target materials with hardened steel strikers of 4.5 mm diameter tips weighing 42 g and of 19 mm diameter weighing 28.3 g usually at 2.5 m per second. The impact strain pulse shapes are increasingly narrower and higher peaked in the order PC, epoxy, PMMA, glass. Semi-quantitative analysis of the general shapes indicates little irreversible deformation work is performed during impacts involving 19 mm striker. However, using the 4.5 mm striker causes irreversible absorption of the net energy received from the striker. The fractional amount absorbed in this series of measurements decreased in the order PC, epoxy, PMMA, and glass. Computer procedures were developed for analyzing and correcting the detailed pulse shapes to reveal how the force and penetration are related and to follow the evolution of the various energy and momentum contributions.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1977
- Accession Number
- ADA045121
Entities
People
- William B. Hillig
Organizations
- General Electric