Under plane stress conditions, most micromechanical and phenomenological models predict a minimum in ductility for strain tension state. Therefore, the state of plays crucial role many forming crash applications reliable measurement to fracture is particularly when calibrating modern initiation models. Recently, new experimental technique has been proposed measuring sheet metal after proportion...

OBJECTIVES To clarify the time-course changes in left ventricular myocardial deformation using velocity vector imaging and to provide insights into our understanding of the cardiac pathophysiology in diabetes mellitus. METHODS Thirty New Zealand white rabbits were randomly divided into either the control group (n = 10) or the diabetes mellitus (DM) group (induced with STZ, n = 20). For the my...

BACKGROUND The newly developed percutaneous heart valve (PHV) implantation technique decreases transaortic pressure gradient in patients with aortic stenosis. PHV replacement effects on left ventricular (LV) global and regional systolic function are currently unknown. METHODS AND RESULTS Eight patients with severe aortic stenosis had 2D echocardiography at baseline and 24 hours after PHV impl...

AIMS This study was designed to characterise both the systolic and diastolic mechanical properties of regions with different degrees of myocardial ischaemic injury after reperfused acute myocardial infarction (AMI). METHODS AND RESULTS Fourteen dogs underwent 90-min coronary artery occlusion followed by reperfusion. Image acquisition was performed 24 h after reperfusion using three techniques...

The compressive high strain-rate behavior of polymeric Kelvin lattice structures with rod-based or plate-based unit cells was investigated through experimental techniques and finite element simulations. Polymeric 5x5x5 cell geometries were manufactured on the millimeter scale using vat polymerization additive manufacturing tested at low (0.001/s) (1000/s) strain-rates. High experiments performe...

AIM Limited data are available about the use of Doppler myocardial imaging (DMI) in small animals. We intend to provide reference values for velocity, strain and strain rate in a large group of healthy rats and studied the reproducibility and repeatability of these parameters. METHODS AND RESULTS A total of 33 male Wistar rats (503+/-41g) underwent baseline transthoracic echocardiography with...

OBJECTIVES This study was performed to evaluate subendocardial function using strain rate imaging (SRI). BACKGROUND The subendocardium and mid-wall of the left ventricle (LV) play important roles in ventricular function. Previous methods used for evaluating this function are either invasive or cumbersome. Strain rate imaging by ultrasound is a newly developed echocardiographic modality based ...

AIMS The present study aims to compare the change of left ventricular deformation during dobutamine stress echocardiography (DSE) with the reference standard of invasive myocardial fractional flow reserve (FFR) to assess the haemodynamic significance of intermediate coronary lesions. METHODS AND RESULTS In 30 patients with an intermediate coronary artery stenosis in one epicardial coronary ar...