A crossbow system for high-strain-rate mechanical testing
This paper describes a technique developed to measure the uniaxial compressive stress - strain properties of polymers at strain rates appropriate to ballistic and impact events over time scales of tens of microseconds using a crossbow as the projectile launch system. The instrument constructed repre...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English English |
| Published: |
Institute of Physics
1996
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| Online Access: | http://psasir.upm.edu.my/id/eprint/38566/1/0001.pdf http://psasir.upm.edu.my/id/eprint/38566/7/S_Hamdan_1996_Meas._Sci._Technol._7_1068.pdf http://psasir.upm.edu.my/id/eprint/38566/ |
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| Summary: | This paper describes a technique developed to measure the uniaxial compressive stress - strain properties of polymers at strain rates appropriate to ballistic and impact events over time scales of tens of microseconds using a crossbow as the projectile launch system. The instrument constructed represents a novel development of existing equipment types. The system is used for compression testing giving stress - strain measurements at strain rates of up to 10⁴ s⁻¹ and over a temperature range of 20-200°c . Stress is calculated directly from a measured force obtained from a calibrated pressure bar. Strain is calculated from the sample displacement measured directly from the intensity reduction of a laser-photodiode unit. The crossbow system provides a relatively inexpensive, reliable and compact alternative to a standard Hopkinson bar. |
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