Research on Uniaxial Tension Test of Brain Tissue

Abstract

Corresponding to low targeting accuracy due to tissue deformation during the process of electrode insertion in sub-thalamic nucleus deep brain stimulation (DBS), biomechanical properties of brain tissue are essential to investigate. In this paper the isolated porcine brain tissue is used in the uniaxial tensile test. Moreover, cylindrical samples of diameter (10 mm) and height (10 mm) are used to measure tensile length by single degree of axis at 5mm/s, until specimen was broken. The stretch ratio of brain tissue has been explored. The material failure criterion parameters, K, 1, 2, of MAT-QUASILINEAR-VISCOELASTIC biological material model in LS-DYNA are fitting calculated according to the experimental results. Six uniaxial failure data obtained from uniaxial tests are 4.81, 5.00, 4.07, 4.62, 4.28, 4.45 respectively. Three failure material constants 1, 2, K are -0.0084, -3.1944, -4.8095. The failure criterion is being implemented in LS-DYNA to simulate brain tissue.