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MPM Instrumented Beverage Can
Impact Tester |
Introduction
Impact tests are performed to measure the response of a material to dynamic
loading. Impact testing in the beverage can industry is used to develop new
can designs, new can materials, and for quality assurance in production.
System Features
The beverage can impact test machine shown in the photograph above
is designed for impact velocities up to 10 ft/s.
A hemispherical striker is used to indent or puncture the can. The striker is
instrumented with strain gages so that load, deflection, and energy data can
be measured. An optical encoder is used to measure the velocity of the
striker from release up to impact with the can. The system is capable of
detecting can wall thickness variations on the order of 0.0001 inches (1
ten-thousandth of an inch). The test machine operates inside a polycarbonate
enclosure to contain any fluid released from the can during testing and to
protect the operator.
Example Data
Example data are shown below. The top graph shows the
striker velocity measurement as a function of time from the release up to
impact with the can. The velocity at impact is used in the integration of the
instrument striker signal (see
Instrumented Impact Testing page). The lower plot shows the
measured voltage from the strain gages. These data are converted into load
data through the calibration with a NIST traceable load cell. The most useful
test parameters for characterizing can performance are peak load, deflection
to peak load, and energy to peak load.
| Click below to enlarge and
enhance photo |
 |
| Beverage Can Impact Test Conducted at
6 ft/sec |
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