Download or read book Enhanced Stop Drill Repair Procedure for Cracked Structures written by H. Armen and published by . This book was released on 1986 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: A repair technique for cracked structures that consists of stop drilling the crack tip is examined. This repair procedure is enhanced by cold expanding the stop-drill hole and by installation of an interference-fit fastener. An experimental and analytical investigation of the effectiveness of the enhanced stop-drill procedure is presented. The analysis consists of elastic-plastic stress analysis utilizing the finite element approach to determine residual stress distributions, stress intensity factors around the stop-drill holes due to cold expansion, and stress intensity factors along the fatigue crack paths followed by crack initiation and crack growth life predictions. Comparisons of the life predictions and fatigue test data are also presented. The results indicate that cold expansion and interference-fit fastener installation improve the fatigue performance of stop-drill holes through crack tips by factors ranging from 3 to 20.

Download or read book Fatigue in Mechanically Fastened Composite and Metallic Joints written by John M. Potter and published by ASTM International. This book was released on 1986 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Improved Guidelines for the Drill Stop hole Retrofit Method of Steel Structures written by Laurence Sanati and published by . This book was released on 2015 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fatigue cracking in steel bridge connections is a prevalent issue faced by our nation's infrastructure. Many techniques have been developed to repair or retrofit these structures in an effort to mitigate damages associated with fatigue cracking. A widely used and effective technique is to drill a hole at the tip of a fatigue crack, removing the sharp notch, which drastically reduces the stress field in the surrounding material. While this method has experienced much success, there is limited guidance on the size of the hole required by the retrofit. Drilling a hole too large removes more material than needed, unnecessarily weakening the section strength and stiffness. On the other hand, drilling a hole too small may insufficiently reduce the stress field, potentially resulting in reinitiation of fatigue cracking. In this thesis, thirty-five finite element models were created to develop a relationship between crack length, hole diameter, and local stress. Using traditional fracture mechanics, a design table is proposed by comparing the local stress intensity to the threshold stress for crack nucleation in structural steel. The table is a function of elastic stress quantities from mechanics formulae and provides guidance toward the selection of an efficiently sized hole diameter to fully arrest crack propagation.

Download or read book The Shock and Vibration Digest written by and published by . This book was released on 1988 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Materials and Process Challenges written by and published by . This book was released on 1996 with total page 920 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book NASA SP written by and published by . This book was released on 1988 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fatigue Design of Aluminum Components and Structures written by Maurice L. Sharp and published by McGraw Hill Professional. This book was released on 1996 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: Focusing on the design challenges associated with using aluminum in such fatigue-critical applications as highway infrastructures, transportation vehicles, automotive suspension systems, and aircraft and machine parts, this reference gives the data and guidelines that mechanical and civil design engineers need to meet these challenges head on.

Download or read book Aeronautical Engineering written by and published by . This book was released on 1988 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt: A selection of annotated references to unclassified reports and journal articles that were introduced into the NASA scientific and technical information system and announced in Scientific and technical aerospace reports (STAR) and International aerospace abstracts (IAA).

Download or read book Key Engineering Materials written by and published by . This book was released on 1987 with total page 894 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Metals Abstracts written by and published by . This book was released on 1996 with total page 740 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Residual Stress in Design Process and Materials Selection written by William B. Young and published by ASM International(OH). This book was released on 1987 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ASTM Standards and Literature References for Composite Materials written by and published by ASTM International. This book was released on 1990 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Aviation Unit and Intermediate Maintenance for Army UH 60A and EH 60A Helicopters written by and published by . This book was released on 1992 with total page 1062 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Aviation Maintenance Technician Handbook Airframe written by Federal Aviation Administration (FAA)/Aviation Supplies & Academics (ASA) and published by Aviation Supplies & Academics. This book was released on 2012 with total page 596 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new FAA AMT Handbook--Airframe Volume 1 isone of two volumes that replace and supersede Advisory Circular (AC) 65-15A. Completely revised and updated, this handbook reflects current operating procedures, regulations, and equipment. This book was developed as part of a series of handbooks for persons preparing for mechanic certification with airframe or powerplant ratings, or both -- those seeking an Aviation Maintenance Technician (AMT) Certificate, also called an A&P license. An effective text for both students and instructors, this handbook will also serve as an invaluable reference guide for current technicians who wish to improve their knowledge. Airframe Volume 1 contains: Aircraft Structures, Aerodynamics, Aircraft Assembly and Rigging, Aircraft Fabric Covering, Aircraft Metal Structural Repair, Aircraft Welding, Aircraft Wood and Structural Repair, Advanced Composite Materials, Aircraft Painting and Finishing, Aircraft Electrical System Includes colored charts, tables, full-color illustrations and photographs throughout, and an extensive glossary and index.

Download or read book Aviation Structural Mechanic S 1 C written by United States. Bureau of Naval Personnel and published by . This book was released on 1967 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Smart Materials Structures and Integrated Systems written by Ahsan Hariz and published by SPIE-International Society for Optical Engineering. This book was released on 1997 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The First Joint DoD FAA NASA Conference on Aging Aircraft written by and published by . This book was released on 1998 with total page 904 pages. Available in PDF, EPUB and Kindle. Book excerpt: