Testing (Material Property Evaluation)
Evaluation of High-speed Deformation Characteristics of Various Materials
Evaluation of High-speed Deformation Characteristics of Various Materials
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- High-speed Tensile Test (Fig. 1)
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- Material to be tested; Steel, aluminium alloy and other metals, various resin materials such as PP
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Strain rate & test machine; Range of strain rate: 10-3 to 103/s
0.001 to 0.1/s: Static tensile test machine
0.01 to 100/s: Hydraulic servo test machine
0.01 to 500/s: Stress sensing block type test machine
500 to 2,000/s: Hopkins pressure bar type test machine - High-speed tensile testing at various temperatures: -196℃ to 400℃
- Determination of various constitutive equations based on the above test results
- Drop Weight Test: High-speed crushing test, compression test
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- Measurement of displacement vs load during crush testing
| Test | Testing equipment | Specification | Measurement example |
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| Drop weight test | Medium-scale drop weight test machine | Drop height: Max. 5.5 m Weight: 10 kgf -100 kgf (possible to be increased up to approx. 140 kgf) |
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| Large-scale drop weight test machine | Drop height: Max. 2.5 m Weight: 290 kgf -1000 kgf |
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| Drop weight test equipment | Drop height: Max. 8 m Weight: Max. 90 kgf |
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| Large-scale high-speed deformation test machine | Max. load: 50 ton Test speed: 0.1 m/sec -11 m/sec Max. stroke: 140 mm Constant speed type |
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- Shape and dimension of test piece :Same shape and dimension for entire strain rate range, thickness is normally 1.0 mm.
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Fig. 1 Influence of strain rate and test temperature on mild steel sheet -
Fig. 2 Applicable strain rate regions of various high-speed tensile test machines
High-speed Tensile Test
Coaxial-type Hopkins pressure bar method
Strain rate: 1,000 s-1 (in case of mild steel)
High-speed video during tensile testing at 10,000 frames/s
