Download or read book Fatigue Crack Retardation and Closure in Polymethylmethacrylate written by F. J. PITONIAK and published by . This book was released on 1973 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: RESULTS ARE PRESENTED FROM AN INVESTIGATION OF CRACK SURFACE PROFILES AND THE INFLUENCE OF INTERMITTENT OVERLOADS ON FATIGUE CRACK GROWTH IN POLYMETHYLMETHACRYLATE, A TRANSPARENT POLYMER. FATIGUE CRACKS WERE GROWN IN COMPACT TENSION SPECIMENS UNDER CONDITIONS OF CONSTANT RANGE IN STRESS INTENSITY FACTOR. TENSILE OVERLOADS WERE FOUND TO PRODUCE CHANGES IN THE SUBSEQUENT CRACK GROWTH SIMILAR TO THOSE OBSERVED IN METALS. THE FATIGUE CRACK GROWTH RATE IN POLYMETHYLMETHACRYLATE MAY BE RETARDED BY APPLICATION OF TENSILE OVERLOADS. EXAMINATION OF MONOCHROMATIC LIGHT INTERFERENCE FRINGE PATTERNS EMANATING FROM THE FATIGUE CRACKS AT ZERO LOAD INDICATE THAT THE CRACK PERIMETER WAS CLOSED AT ZERO LOAD. THE CRACK SURFACES WERE DISPLACED, HOWEVER, IN THE INTERIOR OF THE SPECIMEN AT ZERO LOAD. MEASUREMENTS OF THE CRACK OPENING DISPLACEMENTS DURING LOADING REVEALED THAT SIGNIFICANT TENSILE LOAD WAS REQUIRED TO DISPLACE THE PORTIONS OF THE CRACK SURFACES WHICH WERE INITIALLY CLOSED. THESE OBSERVATIONS ARE DISCUSSED IN LIGHT OF THE ELBER CONCEPT OF CRACK CLOSURE.
Download or read book Experimental Study of Fatigue Crack Propagation and Retardation Using Polymethylmethacrylate written by Francis J. Pitoniak and published by . This book was released on 1972 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fatigue cracks were grown in compact tension specimens of polymethylmethacrylate, a transparent polymer which was used as a model for metals. Various peak overloads applied to the constant DeltaK baselines used produced changes in the baseline load crack growth rates. A study of the monochromatic light interference fringe patterns emanating from the fatigue cracks at zero load indicated that the crack surface were closed along the saw cut edge and on the free surface of the specimens. The crack surfaces were displaced in the interior of the specimen at zero load. Measurement of the crack opening displacements from the fringe patterns indicated that the crack surfaces opened on the free surface at approximately half the baseline load level for a stress ratio of approximately zero. This is in agreement with the Elber crack closure concept.
Download or read book Mechanics of Fatigue Crack Closure written by Wolf Elber and published by ASTM International. This book was released on 1988 with total page 671 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances in Fatigue Crack Closure Measurement and Analysis written by R. Craig McClung and published by ASTM International. This book was released on 1999 with total page 487 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Study of Fatigue Crack Propagation and Retardation Using Polymethylmethacrylate written by Francis J. Pitoniak (CAPT, USAF.) and published by . This book was released on 1972 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Three Dimensional Aspects of Fatigue Crack Closure in Surface Flaws in Polymethylmethacrylate Material written by AF. Grandt and published by . This book was released on 1988 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental investigation using a Newton interference method with a transparent polymethylmethacrylate (PMMA) to measure crack opening displacement and closure on surface flaw crack growth is described. Fatigue crack growth tests are conducted on rectangular plates loaded in bending using optical interferometry measurements to map the crack surface opening displacement profiles and define crack opening loads. Results are presented for an experiment of constant applied stress intensity factor along the crack face free surface. The crack opening displacement patterns and measured closure loads are found to be strongly influenced by the formation of a void internal to the crack surfaces.
Download or read book An Experimental Study of Fatigue Crack Retardation Under Tensile and Compressive Loading in Polymethylmethacrylate written by Kurt Charles Schulz and published by . This book was released on 1986 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fracture Mechanics written by Satya N. Atluri and published by ASTM International. This book was released on 1992 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: Papers of the June 1990 meeting held in Atlanta, Ga. The first volume (47 papers) concentrates on experimental and theoretical aspects of fracture mechanics. Volume two (26 papers) covers numerical and computational approaches. Topics include: ductile fracture, high-temperature and time-dependent fr
Download or read book Fracture Mechanics written by Ted L. Anderson and published by CRC Press. This book was released on 1994-12-16 with total page 1148 pages. Available in PDF, EPUB and Kindle. Book excerpt: This bestselling text/reference provides a comprehensive treatment of the fundamentals of fracture mechanics. It presents theoretical background as well as practical applications, and it integrates materials science with solid mechanics. In the Second Edition, about 30% of the material has been updated and expanded; new technology is discussed, and feedback from users of the first edition has been incorporated.
Download or read book A Study of Fatigue Crack Closure Using Electric Potential and Compliance Techniques written by and published by . This book was released on 1976 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied mechanics reviews written by and published by . This book was released on 1948 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effects of Rest Time on Fatigue Crack Retardation and Observations of Crack Closure written by William N Sharpe (Jr) and published by . This book was released on 1975 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report examines two variables which could influence fatigue crack retardation: rest periods and specimen thickness. A series of experiments are described in which a tensile overload was applied and the specimen allowed to rest at zero load prior to resuming the original cyclic loading. Since the size of the plastic zone is larger for conditions of plane stress than for plane strain, these tests were repeated for several specimen thicknesses.
Download or read book Single Overload Fatigue Crack Growth Retardation an Implementation of Plasticity Induced Closure written by 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 Special Applications and Advanced Techniques for Crack Size Determination written by John J. Ruschau and published by ASTM International. This book was released on 1995 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprises ten papers discussing topics including methods for the measurement of surface crack size, multiple site cracking, and cracking under nonisothermal conditions using AC potential difference procedures; influences of crack deflection and crack splitting on DC potential calibrations; complianc
Download or read book Comprehensive Structural Integrity Cyclic loading and fatigue written by I. Milne and published by Elsevier. This book was released on 2003 with total page 539 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Influence of Fatigue Crack Closure on the Growth Rate of Surface Flaws written by and published by . This book was released on 1994 with total page 239 pages. Available in PDF, EPUB and Kindle. Book excerpt: Inconsistent experimental results of fatigue crack closure studies over the past 15 years have caused recent investigators to conclude that the fundamental phenomena controlling the crack driving mechanisms are not understood. A major contributor to this misunderstanding is an inadequate understanding of the complex three-dimensional nature of closure. This is true for two-dimensional thru-the-thickness cracks as well as for three-dimensional part-thru surface cracks. To assess the three-dimensional influences of fatigue crack closure on the growth rate of surface flaws, an experimental investigation was conducted using a rectangular plate of polymethylmethacrylate (PMMA) material loaded in four-point bending. The use of transparent PMMA material and a Newton optical interferometer system with a laser light source provided the capability to simultaneously measure three-dimensional crack opening displacement (COD) profiles and closure loads (Pc1).
Download or read book USAF Damage Tolerant Design Handbook written by and published by . This book was released on 1984 with total page 636 pages. Available in PDF, EPUB and Kindle. Book excerpt:
