A low relative area change (RAC) of the proximal pulmonary artery (PA) over the cardiac cycle is a good predictor of mortality from right ventricular failure in patients with pulmonary hypertension (PH). The relationship between RAC and local mechanical properties of arteries, which are known to stiffen in acute and chronic PH, is not clear, however. In this study, we estimated elastic moduli o...

Dynamic changes of elastic moduli in source volumes are predicted to produce "damagerelated-radiation" associated with products of the changes of elastic moduli and total elastic strain components in the source volume [Ben-Zion and Ampuero, 2009]. Decreasing elastic moduli (as produced by brittle deformation of low-porosity rocks and explosions) increase the radiation to the bulk, while increas...

Although much has been learned about the elastic properties of solids with cracks, virtually all the work has been confined to the case when the cracks are stationary, that is, neither grow nor shorten during loading. In that case, the elastic moduli obtained are the secant moduli. The paper deals with the practically much more important but more difficult case of tangential moduli for incremen...

The apparent sti}ness tensors of two!dimensional elastic composite samples smaller than the representative volume element "RVE# are studied as a function of system size[ Numerical experiments are used to investigate how the apparent properties of the composite converge with increasing scale factor n\ de_ned to be the ratio between the linear size of the composite and the linear size of the unit...

Conceptually, the elastic characteristics of cancellous bone could be predicted directly from the trabecular morphology--or architecture--and by the elastic properties of the tissue itself. Although hardly any experimental evidence exists, it is often implicitly assumed that tissue anisotropy has a negligible effect on the apparent elastic properties of cancellous bone. The question addressed i...

Inclusion-based formulations allow an explicit description of pore geometry by viewing porous rocks as a solid matrix with embedded inclusions representing individual pores. The assumption commonly used in these formulations that there is no fluid pressure communication between pores is reasonable for liquid-filled rocks measured at high frequencies; however, complete fluid pressure communicati...