Author : National Aeronautics and Space Adm Nasa
Publisher :
ISBN 13 : 9781729092088
Total Pages : 40 pages
Book Rating : 4.0/5 (92 download)
Book Synopsis An Improved Boundary Force Method for Analyzing Cracked Anisotropic Materials by : National Aeronautics and Space Adm Nasa
Download or read book An Improved Boundary Force Method for Analyzing Cracked Anisotropic Materials written by National Aeronautics and Space Adm Nasa and published by . This book was released on 2018-10-22 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Boundary Force Method (BFM), a form of indirect boundary element method, is used to analyze composite laminates with cracks. The BFM uses the orthotropic elasticity solution for a concentrated horizontal and vertical force and a moment applied at a point in a cracked, infinite sheet as the fundamental solution. The necessary stress functions for this fundamental solution were formulated using the complex variable theory of orthotropic elasticity. The current method is an improvement over a previous method using only forces and no moment. The improved method was verified by comparing it to accepted solutions for a finite-width, center-crack specimen subjected to uniaxial tension. Four graphite/epoxy laminates were used: (0 ] or - 45/90)sub s, (0), (+ or - 45)sub s, and (+ or - 30)sub s. The BFM results agreed well with accepted solutions. Convergence studies showed that with the addition of the moment in the fundamental solution, the number of boundary elements required for a converged solution was significantly reduced. Parametric studies were done for two configurations for which no orthotropic solutions are currently available; a single edge crack and an inclined single edge crack. Tan, Paul W. and Bigelow, Catherine A. Langley Research Center RTOP 506-43-11-04...
