Influences of bar/specimen contact surfaces indentation on strain measurement in SHPB experiments

ZHANG Zu-gen; LI Ying-lei; LI Ying-hua; CHEN Xi-meng

doi:10.11883/1001-1455(2009)06-0573-06

Volume 29 Issue 6

Sep. 2014

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Article Navigation > Explosion And Shock Waves > 2009 > 29(6): 573-578

ZHANG Zu-gen, LI Ying-lei, LI Ying-hua, CHEN Xi-meng. Influences of bar/specimen contact surfaces indentation on strain measurement in SHPB experiments[J]. Explosion And Shock Waves, 2009, 29(6): 573-578. doi: 10.11883/1001-1455(2009)06-0573-06

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ZHANG Zu-gen, LI Ying-lei, LI Ying-hua, CHEN Xi-meng. Influences of bar/specimen contact surfaces indentation on strain measurement in SHPB experiments[J]. Explosion And Shock Waves, 2009, 29(6): 573-578. doi: 10.11883/1001-1455(2009)06-0573-06

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Influences of bar/specimen contact surfaces indentation on strain measurement in SHPB experiments

doi: 10.11883/1001-1455(2009)06-0573-06

1.
School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, Gansu, China;
2.
National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, Sichuan, China

Publish Date: 2009-11-25

Abstract

Abstract

The dynamic compression stress-strain relations of iron specimens with three sizes were obtained with a split Hopkinson pressure bar apparatus. Based on these experimental results, an empirical model was presented to quantitatively describe the influence of bar/specimen contact surfaces indentation on strain measurement in SHPB experiments. This research shows that the influence on elastic strain is obvious, even when the uneven stress states in specimens eliminated by using pulse shapers; while the influence on plastic strain is related to the hardening modulus and length of the specimen: the influence will be obvious when the hardening modulus is large and the size of the specimen is comparatively small, and the correction for plastic strain is needed.
- solid mechanics,
- strain correction,
- SHPB,
- indentation on contact surface,
- strain measurement

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