A bouncemeter for measuring resilience

✍ Scribed by F. Rodriguez; M. A. Acevedo

• Book ID: 101257600
• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 193 KB
• Volume: 66
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19971128)66:9<1787::aid-app18>3.0.co;2-s

✦ Synopsis

A device has been constructed which gives a convenient and reproducible measure of the resilience of elastic materials including thermoplastic elastomers as well as conventional crosslinked rubber. A steel ball strikes the surface of the firmly anchored sample at an angle of 45Њ. The horizontal distance traveled (the bounce distance), is recorded by having the ball make a mark in a shallow bed of fine gravel. In the common Lu ¨pke and Bashore devices, the rebound of a metal element usually is estimated while the element is still in motion. It is shown that the bounce distance B is proportional to the square root of the Bashore or Lu ¨pke rebound. All resilience tests are sensitive to the thickness of the sample used. However, tests with various rubbers and thermoplastic elastomers confirm that the square root relationship holds reasonably well for samples that are 1.27 cm thick over the range of 10 to 85% Bashore rebound.