Download or read book An Experimental Study of Fatigue Crack Growth from Fastener Holes Repaired by Coldworking written by Walter Joseph Cesarz and published by . This book was released on 1978 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Experimental Study of the Interaction of Strain Fields Between Coldworked Fastener Holes written by Mark T. Tipton and published by . This book was released on 1980 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Experimental Study of Crack Initiation and Growth from Coldworked Holes written by Nopporn Chandawanich and published by . This book was released on 1977 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Extended Study of Flaw Growth at Fastener Holes written by T. M. Hsu and published by . This book was released on 1978 with total page 347 pages. Available in PDF, EPUB and Kindle. Book excerpt: An analytical and experimental investigation was conducted to characterize the fracture and cyclic-growth behavior of cracks emanating from various types of fastener holes, such as open, close-tolerance, interference- fit, and cold-worked fastener holes. An analytical approach was developed for estimating stress intensity factors for through cracks emanating from these types of fastener holes. Approximate stress intensity factors for quarter- elliptical cracks emanating from a corner of the same types of fastener holes were derived from corresponding through-crack solutions. Two alloy plates (2219- T851 aluminum and 6Al-4V (ELI) beta annealed titanium) with and without intentional initial flaws were tested under constant amplitude cyclic load and flight-by-flight fighter and bomber spectrum loads. Two initial flaw shapes corresponding to a quarter-circular corner crack and a through-the-thickness crack and three initial crack lengths (small, intermediate and large) were used in the test program. Three levels of cold working and interference and one level of fastener load transfer were included for each alloy. The amount of load transferred through the loaded fastener was maintained uniformly at the level which produced a bearing stress equal to the far-field stress. Correlations between calculated stress intensities and those reduced from fatigue crack growth data were good, except for very small cracks growing from the cold-worked holes. Also, the natural cracks initiated in the fatigue tests were most commonly corner and embedded types whose shapes corresponded quite closely to the quarter- and semi-elliptical shapes used in the analyses.
Download or read book Fracture and Fatigue Crack Growth Behavior of Surface Flaws and Flaws Originating at Fastener Holes written by L. R. Hall and published by . This book was released on 1974 with total page 351 pages. Available in PDF, EPUB and Kindle. Book excerpt: The combined experimental and analytical study was undertaken to investigate the fatigue crack growth behavior of surface flaws and part-thru and thru cracks originating at fastener holes. Three alloys (2219-T851 aluminum, 9Ni-4Co-0.2C steel, and 6Al-4V (ELI) beta annealed titanium) were tested under three different loading profiles (constant cyclic load, periodic overload, spectrum load). Surface flaw test variables included loading conditions (uniform tension, pure bending, combined bending and tension), stress ratio (0. 1, 0.3, 0.5), initial flaw shape (0.15
Download or read book Predicting Fatigue Crack Growth in the Residual Stress Field of a Cold Worked Hole written by MT. Kokaly and published by . This book was released on 2005 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cold working of holes generates compressive residual stresses resulting in a significant fatigue life improvement over a non-cold worked hole. Current fatigue life prediction methods for cold worked holes are based on two-dimensional (2-D) linear superposition of stress intensity factor, K, solutions of the non-cold worked hole and the residual stresses. Such predictions have shown various levels of agreement with the overall fatigue life and have generally underpredicted the crack growth over the majority of life. An inverse process was used to generate K solutions for the residual stresses of two experimental data sets using AFGROW and the crack growth data from the experiments. The inverse K solutions were inconsistent with the residual stress distribution indicating that it contained mechanisms or features not inherent to the 2-D weight function method. The predicted fatigue life was found to be very sensitive to a ± 1% variance in the inversely generated K solution. This sensitivity of the K method is a very important issue that must be addressed in the future. A 2-D FEA model indicated that the crack remained completely closed over a range of crack lengths despite experimental crack growth indicating that the model was not an accurate physical representation of the real crack. The results of this study combined with the significantly faster crack growth observed on the side of the hole corresponding to the entry side of the mandrel and the through thickness residual hoop stress variation show that the current methodology based on a 2-D assumptions is inadequate in predicting the fatigue crack growth from cold worked holes for the range of specimen thicknesses in this study. It is suggested that further research focus on incorporating the through thickness stress variance in a solution that predicts crack growth both in the radial and through thickness directions to capture the peculiar crack growth associated with cold working.
Download or read book Masters Abstracts written by and published by . This book was released on 1979 with total page 900 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Predicting Fatigue Crack Growth in the Residual Stress Field of a Cold Worked Hole written by Jude H. Restis and published by . This book was released on 2007 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cold working of holes generates compressive residual stresses resulting in a significant fatigue life improvement over a non-cold worked hole. Current fatigue life prediction methods for cold worked holes are based on two-dimensional (2-D) linear superposition of stress intensity factor, K, solutions of the non-cold worked hole and the residual stresses. Such predictions have shown various levels of agreement with the overall fatigue life and have generally underpredicted the crack growth over the majority of life. An inverse process was used to generate K solutions for the residual stresses of two experimental data sets using AFGROW and the crack growth data from the experiments. The inverse K solutions were inconsistent with the residual stress distribution indicating that it contained mechanisms or features not inherent to the 2-D weight function method. The predicted fatigue life was found to be very sensitive to a ± 1 % variance in the inversely generated K solution. This sensitivity of the K method is a very important issue that must be addressed in the future. A 2-D FEA model indicated that the crack remained completely closed over a range of crack lengths despite experimental crack growth indicating that the model was not an accurate physical representation of the real crack. The results of this study combined with the significantly faster crack growth observed on the side of the hole corresponding to the entry side of the mandrel and the through thickness residual hoop stress variation show that the current methodology based on a 2-D assumptions is inadequate in predicting the fatigue crack growth from cold worked holes for the range of specimen thicknesses in this study. It is suggested that further research focus on incorporating the through thickness stress variance in a solution that predicts crack growth both in the radial and through thickness directions to capture the peculiar crack growth associated with cold working.
Download or read book Fracture and Fatigue Crack Growth Behavior of Surface Flaws and Flaws Originating at Fastener Holes Volume I Results and Discussion written by L. R. Hall and published by . This book was released on 1974 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt: The combined experimental and analytical study was undertaken to investigate the fatigue crack growth behavior of surface flaws and part-thru and thru cracks originating at fastener holes. Three alloys (2219-T851 aluminum, 9Ni-4Co-0.2C steel, and 6Al-4V (ELI) beta annealed titanium) were tested under three different loading profiles (constant cyclic load, periodic overload, spectrum load). Surface flaw test variables included loading conditions (uniform tension, pure bending, combined bending and tension), stress ratio (0.1, 0.3, 0.5), initial flaw shape (0.15
Download or read book An Experimental Study of Fatigue Crack Growth in Aluminum Sheet Subjected to Combined Bending and Membrane Stresses written by Edward P. Phillips and published by . This book was released on 1997 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Residual Stress and Fatigue Crack Growth Life Prediction in Fastener Holes Cold worked by Uniform Indentation in 2024 T351 Aluminium Alloy written by Jeffrey Meng-Lee Tan and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Second Joint NASA FAA DoD Conference on Aging Aircraft written by and published by . This book was released on 1999 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fracture and Fatigue Crack Growth Behavior written by L. R. Hall and published by . This book was released on 1974 with total page 351 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Extended Study of Flaw Growth at Fastener Holes Volume 2 Data Tabulations written by T. M. Hsu and published by . This book was released on 1978 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt: An analytical and experimental investigation was conducted to characterize the fracture and cyclic-growth behavior of cracks emanating from various types of fastener holes, such as open, close-tolerance, interference- fit, and cold worked fastener holes. An analytical approach was developed for estimating stress intensity factors for through cracks emanating from these types of fastener holes. Approximate stress intensity factors for quarter- elliptical cracks emanating from a corner or the same types of fastener holes were derived from corresponding through-crack solutions. Two alloy plates (2219- T851 aluminum and 6Al-4V(ELI) beta annealed titanium) with and without intentional initial flaws were tested under constant amplitude cyclic load and flight-by-flight fighter and bomber spectrum loads. Two initial flaw shapes corresponding to a quarter-circular corner crack and a through-the-thickness crack and three inital crack lengths (small, intermediate and large) were used in the test program. Three levels of cold working and interference and one level of fastener load transfer were included for each alloy. The amount of load transferred through the loaded fastener was maintained uniformly at the level which produced a bearing stress equal to the far-field stress.
Download or read book The Experimental Characterisation of Residual Stresses and Fatigue Crack Growth in the Vicinity of Cold Worked Holes in Al 2024 T351 written by Maria Priest and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ICAF 97 Lecture papers written by R. Cook and published by . This book was released on 1997 with total page 676 pages. Available in PDF, EPUB and Kindle. Book excerpt:
