Human body is constantly under the influence of acceleration loads in environments such as combat flying. This study investigates the effect of body acceleration on human heart function by using finite element analysis. The nonlinear mechanical behavior of myocardium is modeled by Yeoh hyperelastic model. Stress-strain curves of myocardium are determined based on uniaxial compression tests on bovine heart samples. Nonlinear least square curve fitting is conducted in order to obtain material parameters. Heart geometrical modeling in three-dimension is done by segmentation of cardiac MRI images. Obtained material coefficients are assigned to the constructed heart model and appropriate pressure and acceleration loads are considered. By application of finite element method, stress distributions are calculated. Results indicate average stress in the internal wall of left ventricle is increased by 9.4% from 15.9 to 17.4kPa as the acceleration increases from +1G to +6G.

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