We measured pressure-volume curves in nine excised dog ventricles and stress-strain curves in two to five muscle specimens from each ventricle to verify a derived formula that relates muscle stiffness to the ventricular pressure-volume curve. The assumptions underlying this formula are: (1) the ventricle is a uniform spherical shell, (2) all muscle fibers carry average stress and deform as if t...

In this study, nonlinear vibration of a composite cable is investigated by considering nonlinear stress-strain relations. The composite cable is composed of an aluminum wire as reinforcement and a rubber coating as matrix. The nonlinear governing equations of motion are derived about to an initial curve and based on the fundamentals of continuum mechanics and the nonlinear Green-Lagrangian stra...

The air shafts of coal mines contain solid, liquid, and gaseous substances that corrode concrete under conditions relatively high temperature humidity. coupling various factors decreases the strength thus bearing capacity shaft lining. In this study, corrosion tests were carried out by simulating complex environment a mine lining to study variation in stress-strain curve. For corroded specimens...