High Speed Tensile test

This complex test method is used to determine the data of plastic materials at very high stressing rates.

During crash events, plastic parts are heavily exposed to high rates of stressing and deformation. Extensive knowledge is available about the mechanical behaviour of plastics at low rates. Due to the complicated experimental procedure, not enough reliable material data has so far been determined at typical crash speeds (up to 45 mph).

In order to increase safety, however, reliable material properties at typical crash speeds are essential for precise simulations of crash processes involving plastic parts.

In a high speed tensile test, the required high stressing rates of up to 65 feet/s (45 mph) are achieved with the help of servo-hydraulic test equipment. At the same time, any local deformations which occur are determined using an ultra-high speed camera with a maximum frequency of 1 MHz. This corresponds to one million pictures per second.

High speed tensile test at UL High speed tensile test at UL

The results of the high speed tensile test are “force-displacement curves”. From these, technical as well as true stress-strain curves can be developed, which are essential data input for precise crash simulations.

An ultra-high speed camera documents the process An ultra-high speed camera documents the process