EVALUATION OF STRESS INTENSITY FACTOR OF MULTIPLE SITE DAMAGE CRACKS USING BOUNDARY ELEMENT METHOD

• Main Author: YULLYAWAN (NIM : 23607007); Pembimbing : Dr. Ir. Ichsan Setya Putra; Dr. Ir. Tatacipta Dir, ANDHI
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/14863
• Institution: Institut Teknologi Bandung

Problems multiple site damage (MSD) usually occur in older airplanes. Example cases of accidents due to MSD is Boeing 737-200 operated by Aloha Airlines on April 28, 1988. The aircraft experienced an explosive decompression and structural failure because of the emergence of some cracked rivet hole in the fuselage lap joint. <br /> <br /> <br /> <br /> This research aims to obtain geometry factors (&#946;) on the fuselage lap joint with 2 and 9 column of rivet. Research done in four MSD configurations using BE-STAD (Boundary Element Solutions for Structural Analysis and Design) software. <br /> <br /> <br /> <br /> To get the geometry factors (&#946;) on Lap joint, performed two-stage modeling, first, modeling lap joint with attachment point. Second, modeling plate with rivet hole, the bearing force earned from the first modeling applied along the half circle on the rivet hole. Than stress intensity factor is calculated from the second model in the four MSD configurations that have been determined. <br /> <br /> <br /> <br /> The geometry factor (&#946;) obtained through comparison of stress intensity factor and &#963; &#8730;&#960;a, than the results compared with the finite element method. Before crack connecting, the comparison of geometry factor between the BEM and FEM obtain a good results with the difference varies from each configuration ranged between 0.01% - 9:37%. After joining, geometry factor value have a big difference because of of differences in crack path. The difference crack path will be very influential to the geometry factor.