Strain distribution in the intervertebral disc under unconfined compression and tension load by the optimized digital image correlation technique.
The unconfined compression and tension experiments of the intervertebral disc were conducted by applying an optimized digital image correlation technique, and the internal strain distribution was analysed for the disc. It was found that the axial strain values of different positions increased obviously with the increase in loads, while inner annulus fibrosus and posterior annulus fibrosus experienced higher axial strains than the outer annulus fibrosus and anterior annulus fibrosus. Deep annulus fibrosus exhibited higher compressive and tensile axial strains than superficial annulus fibrosus for the anterior region, while there was an opposite result for the posterior region. It was noted that all samples demonstrated a nonlinear stress-strain profile in the process of deforming, and an elastic region was shown once the sample was deformed beyond its toe region.
Tianjin Key Laboratory for Control Theory & Applications in Complicated Industry Systems, School of Mechanical Engineering, Tianjin University of Technology, Tianjin, P.R. China.
Qing
Q
Liu
School of Mechanical Engineering, Tianjin University, Tianjin, P.R. China.
Tai-Yong
TY
Wang
Tianjin Key Laboratory for Control Theory & Applications in Complicated Industry Systems, School of Mechanical Engineering, Tianjin University of Technology, Tianjin, P.R. China.
Xiu-Ping
XP
Yang
School of Electronic Information Engineering, Tianjin University of Technology, Tianjin, P.R. China.
Kun
K
Li
Tianjin Key Laboratory for Control Theory & Applications in Complicated Industry Systems, School of Mechanical Engineering, Tianjin University of Technology, Tianjin, P.R. China.
Li-Lan
LL
Gao
Tianjin Key Laboratory for Control Theory & Applications in Complicated Industry Systems, School of Mechanical Engineering, Tianjin University of Technology, Tianjin, P.R. China zhang_chunqiu@126.com.
Chun-Qiu
CQ
Zhang
Tianjin Key Laboratory for Control Theory & Applications in Complicated Industry Systems, School of Mechanical Engineering, Tianjin University of Technology, Tianjin, P.R. China.
Yue-Hong
YH
Guo
Intervertebral disc; axial compression; axial tension; internal strain; optimized digital image correlation technique