Showing papers by "Iran University of Science and Technology published in 1980"
TL;DR: In this paper, the authors calculated the loss of compressive stiffness of a thin square plate buckled in shear, and the significance of these results in the design of a stiffened shear web was examined.
Abstract: The loss of compressive stiffness of a thin square plate buckled in shear is calculated. Two cases are considered, first a perfectly flat plate, and second a plate with an imperfection amplitude equal to 10 per cent of the plate thickness. Changes in shear stiffess are also plotted. The analysis is by a finite-element method. Substantial reductions in compressive stiffness due to shear buckling are found, with further variation in stiffness as the buckling mode develops. The significance of these results in the design of a stiffened shear web is examined. It is shown that, by a suitable design procedure, the corresponding loss of efficiency can be made quite small.
3 citations
01 Jan 1980
TL;DR: The internal friction of cold-worked single crystals of high-purity copper has been measured in the temperature range from 60 to 200K at frequencies between 12 and 22 kHz as mentioned in this paper.
Abstract: The internal friction of cold-worked single crystals of high-purity copper has been measured in the temperature range from 60 to 200K at frequencies between 12 and 22 kHz. The temperature, height and shape of the Bordoni peak were studied as a function of the magnitude of the resolved shear stress used to deform crystals of , and orientations. The peak was found to be much larger for crystals than for the other orientations; this difference is attributed to the different dislocation structure observed by electron microscopy. Most of the measurements were made without removing the ends of the crystal which had been gripped in the tensometer; removal of these ends had an unexpectedly large effect for the crystals of orientation.