A Miniaturized Split Hopkinson Pressure Bar for Very High Strain Rate Testing

2004 ◽  
Author(s):  
Clive R. Siviour ◽  
Jennifer L. Jordan
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Split Hopkinson Pressure Bar ◽  
Hopkinson Pressure Bar ◽  
High Strain Rate Testing ◽  
Rate Testing ◽  
Split Hopkinson ◽  
Pressure Bar ◽  
Very High

High Strain Rate Testing of Bovine Trabecular Bone

2010 ◽  
Vol 132 (8) ◽  
Author(s):  
A. Pilcher ◽  
X. Wang ◽  
Z. Kaltz ◽  
J. G. Garrison ◽  
G. L. Niebur ◽  
...  
Keyword(s):  
Strain Rate ◽  
Trabecular Bone ◽  
High Strain ◽  
Split Hopkinson Pressure Bar ◽  
Hopkinson Pressure Bar ◽  
Deformation Response ◽  
High Strain Rate Testing ◽  
Rate Testing ◽  
Split Hopkinson ◽  
Pressure Bar

In spinal vertebral burst fractures, the dynamic properties of the trabecular centrum, which is the central region of porous bone inside the vertebra, can play an important role in determining the failure mode. If the failure occurs in the posterior portion of the vertebral body, spinal canal occlusion can occur and ejected trabecular bone can impact the spinal cord resulting in serious injury. About 15% of all spinal cord injuries are caused by such burst fractures. Unfortunately, due to the uniqueness of burst fracture injuries, postinjury investigation cannot always accurately assess the degree of damage caused by these fractures. This research makes an effort to begin understanding the governing effects in this important bone fracture event. Measurements of the dynamic deformation response of bovine trabecular bone with the marrow intact and marrow removed using a modified split-Hopkinson pressure bar apparatus are reported and compared with quasistatic deformation response results. Because trabecular bone is more compliant and lower in strength than cortical bone, typical Hopkinson pressure bar experimental techniques used for high strain rate testing of harder materials cannot be applied. Instead, a quartz-crystal-embedded, split-Hopkinson pressure bar developed for testing compliant, low strength materials is used. Care is taken into account for the orthotropic properties in the bone by testing only along the principle material axes, determined through microcomputed tomography. In addition, shaping of the stress wave pulse is used to ensure a constant strain rate and homogeneous specimen deformation. Results indicate that the strength of trabecular bone increases by a factor of approximately 2–3 when the strain rate increases from 10−3 s−1 to 500 s−1 and that the bone fractures beyond a critical strain.

A Very High Strain Rate Compression Test Using a Modified Split Hopkinson Pressure Bar Technique

1997 ◽  
Vol 145-149 ◽  
pp. 343-348
Author(s):  
Ouk Sub Lee ◽  
J.H. Chong ◽  
S.S. You ◽  
Seon Soon Choi ◽  
Heung Seok Kang ◽  
...  
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
Compression Test ◽  
High Strain ◽  
Split Hopkinson Pressure Bar ◽  
Hopkinson Pressure Bar ◽  
Split Hopkinson ◽  
Strain Rate Compression ◽  
Pressure Bar ◽  
Very High

High Strain Rate Response of Rocks Under Dynamic Loading Using Split Hopkinson Pressure Bar

2017 ◽  
Vol 36 (1) ◽  
pp. 531-549 ◽  
Author(s):  
Sunita Mishra ◽  
Hemant Meena ◽  
Vedant Parashar ◽  
Anuradha Khetwal ◽  
Tanusree Chakraborty ◽  
...  
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
Dynamic Loading ◽  
High Strain ◽  
Split Hopkinson Pressure Bar ◽  
Hopkinson Pressure Bar ◽  
Split Hopkinson ◽  
Pressure Bar
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