How to test brain and brain simulant at ballistic and blast strain rates.
Mechanical properties of brain tissue and brain simulant at strain rate in the range of 1000 s-1 are essential for computational simulation of intracranial responses for ballistic and blast traumatic brain injury. Testing these ultra-soft materials at high strain rates is a challenge to most conventional material testing methods. The current study developed a modified split Hopkinson bar techniques using the combination of a few improvements to conventional split Hopkinson bar including: using low impedance aluminum bar, semiconductor strain gauge, pulse shaping technique and annular specimen. Feasibility tests were conducted using a brain stimulant, Sylgard 527. Stress-strain curves of the simulant were successfully obtained at strain rates of 2600 and 2700 s-1 for strain levels up to 60%. This confirmed the applicability of Hopkinson bar for mechanical properties testing of brain tissue in the ballistic and blast domain.
Zhang
Jiangyue
J
Department of Neurosurgery, Medical College of Wisconsin, VA Medical Center, Milwaukee, WI, USA.
Song
Bo
B
Pintar
Frank A
FA
Yoganandan
Narayan
N
Chen
Weinong
W
Gennarelli
Thomas A
TA