Pulmonary contusion and other pulmonary injuries can result from common traumas such as motor vehicle crashes, falls or crush injuries, and in military settings such as behind armor blunt trauma. However, injury mechanisms in blunt pulmonary trauma are not well understood for insight into injury prediction. As a starting point for further study, the quasi-static response of lung parenchyma has been characterized using fresh porcine lung, which is structurally comparable to human lung. Shear quasi-static data were used to achieve two constitutive model fits with a single parameter set using the Fung exponential and the Hill Foam models, while indentation quasi-static data were used in validation. Model fit attained with the experimental shear data resulted in a graphically comparable response between the two constitutive models. However, in the indentation validation set, the Fung model had the better fit with sum squared error (SSE) 143, while the Hill Foam model had SSE=762. Though the Fung model was a better fit for quasi-static data, future addition of viscoelastic data may provide a different result with the focus towards later selection of appropriate material models for finite element modeling.
Keywords:
Biomechanics; Constitutive Modeling; Lung; Material Properties; Quasi-Static