Showing papers by "Grant P. Steven published in 1993"
TL;DR: In this paper, a simple evolutionary procedure is proposed for shape and layout optimization of structures, where low stressed material is progressively eliminated from the structure during the evolution process, and various examples are presented to illustrate the optimum structural shapes and layouts achieved by this procedure.
1,975 citations
TL;DR: In this article, explicit formulas for correcting finite-element predictions of natural frequencies are presented for longitudinal, torsional and bending vibrations of beams, and it is shown that the errors in the original finite element predictions can be reduced by about 50 per cent after such a correction.
Abstract: Explicit formulas for correcting finite-element predictions of natural frequencies are presented for longitudinal, torsional and bending vibrations of beams. By employing these simple explicit formulas the finite-element discretization error in the natural frequency predictions can be effectively reduced at almost no computational cost. For longitudinal and torsional vibrations the frequency correction always yields the exact solution, while for the bending vibration it gives a significant improvement over the uncorrected frequencies. This method is also applied to two- and three-dimensional frames, and it is found that the errors in the original finite-element predictions of natural frequencies are reduced by about 50 per cent after such a correction.
14 citations
Proceedings Article•
19 Feb 1993
TL;DR: In this article, the authors report on initial investigations into the manufacturing and testing of stiffened carbon fiber composite panels for buckling and postbuckling strength, using the Shadow Moire Fringe technique and using resistive strain gauges.
Abstract: This paper reports on initial investigations into the manufacturing and testing of Stiffened Carbon Fiber Composite Panels for buckling and postbuckling strength. Five panels were manufactured using different manufacturing techniques and a full description of these panels is given. All panels were tested to failure in an INSTRON compression testing machine. Buckling mode shapes were observed through the use of the Shadow Moire Fringe technique and strain measurements were obtained using resistive strain gauges. Linear finite element analysis was also carried out to compare predicted buckling loads with experimental results.
2 citations