Oxygen-free copper of >99.95% purity was processed by equal-channel angular pressing at room temperature (RT) for up to 24 passes and then pulled failure RT using strain rates from 10?4 10?2 s?1. The results show that the microstrain increases with lower numbers but decreases between 16 passes. Similar trends were found also dislocation density, Vickers microhardness values measured yield stres...

THE article by Kurtz and Morris 1 in this issue of Hypertension raises important issues with regard to the use of genetically hypertensive rats. These issues are 1) the origins of various stocks, 2) the definition and maintenance of the integrity of various stocks of interest in hypertension research, and 3) the construction, appropriateness, and use of control strains for comparison with hyper...

Tensile stress–strain and stress relaxation properties of 1100 equivalent weight Nafion have been measured from 23 to 120 C at 0–100% relative humidity. At room temperature, the elastic modulus of Nafion decreases with water activity. At 90 C, the elastic modulus goes through a maximum at a water activity of 0.3. At temperatures 90 C, hydrated membranes are stiffer than dry membranes. Stressrel...

This work presents a hybrid shear-flexible beam-element, capable of capturing arbitrarily large inelastic displacements and rotations planar frame structures with just one element per member. Following Reissner's geometrically exact theory, the finite problem is herein formulated within nonlinear programming principles, where total potential energy treated as objective function strain-displacem...

One of the standard experimental probes of a viscoelastic material is to measure the response of a layer trapped between parallel surfaces, imposing either periodic stress or strain at one boundary and measuring the other. The relative phase between stress and strain yields solid-like and liquid-like properties, called the storage and loss moduli, respectively, which are then captured over a ra...

A study is described that is aimed at investigating the strain/scalar dissipation layer relationship in unity Schmidt number turbulent flows. This analysis makes use of simultaneous PIV/acetone PLIF data that were acquired in a previous study of turbulent planar nonreacting jets. In particular, we seek to investigate the extent to which the measured strain field can be used to predict the struc...

Stress relaxation and structural analysis were used to investigate the zonally differentiated microstructural response to compression of the integrated cartilage-on-bone tissue system. Fifteen cartilage-on-bone samples were divided into three equal groups and their stress relaxation responses obtained at three different levels of axial compressive strain defined as low (~20%), medium (~40%) and...

The force-extension behavior of single modular biomacromolecules is known to exhibit a characteristic repeating pattern of a nonlinear rise in force with imposed displacement to a peak, followed by a significant force drop upon reaching the peak. This “saw-tooth” pattern is a result of stretch-induced unfolding of modules along the molecular chain and is speculated to play a governing role in t...