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An Experimental Study of Fatigue Crack Retardation Under Tensile and Compressive Loading in Polymethylmethacrylate

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Release : 1986
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Book Synopsis An Experimental Study of Fatigue Crack Retardation Under Tensile and Compressive Loading in Polymethylmethacrylate by : Kurt Charles Schulz

Download or read book An Experimental Study of Fatigue Crack Retardation Under Tensile and Compressive Loading in Polymethylmethacrylate written by Kurt Charles Schulz. This book was released on 1986. Available in PDF, EPUB and Kindle. Book excerpt:

Experimental Study of Fatigue Crack Propagation and Retardation Using Polymethylmethacrylate

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Author :
Release : 1972
Genre : Polymethylmethacrylate
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Book Synopsis Experimental Study of Fatigue Crack Propagation and Retardation Using Polymethylmethacrylate by : Francis J. Pitoniak

Download or read book Experimental Study of Fatigue Crack Propagation and Retardation Using Polymethylmethacrylate written by Francis J. Pitoniak. This book was released on 1972. 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.

Experimental Study of Fatigue Crack Propagation and Retardation Using Polymethylmethacrylate

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Author :
Release : 1972
Genre : Materials
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Book Synopsis Experimental Study of Fatigue Crack Propagation and Retardation Using Polymethylmethacrylate by : Francis J. Pitoniak (CAPT, USAF.)

Download or read book Experimental Study of Fatigue Crack Propagation and Retardation Using Polymethylmethacrylate written by Francis J. Pitoniak (CAPT, USAF.). This book was released on 1972. Available in PDF, EPUB and Kindle. Book excerpt:

Fatigue Crack Retardation and Closure in Polymethylmethacrylate

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Author :
Release : 1973
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Book Synopsis Fatigue Crack Retardation and Closure in Polymethylmethacrylate by : F. J. PITONIAK

Download or read book Fatigue Crack Retardation and Closure in Polymethylmethacrylate written by F. J. PITONIAK. This book was released on 1973. 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.

Masters Theses in the Pure and Applied Sciences

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Release : 2012-12-06
Genre : Science
Kind : eBook
Book Rating : 912/5 ( reviews)

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Book Synopsis Masters Theses in the Pure and Applied Sciences by : Wade H. Shafer

Download or read book Masters Theses in the Pure and Applied Sciences written by Wade H. Shafer. This book was released on 2012-12-06. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thougtit that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all con cerned if the printing and distribution of the volumes were handled by an interna tional publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 31 (thesis year 1986) a total of 11 ,480 theses titles trom 24 Canadian and 182 United States universities. We are sure that this broader base tor these titles reported will greatly enhance the value ot this important annual reterence work. While Volume 31 reports theses submitted in 1986, on occasion, certain univer sities do re port theses submitted in previousyears but not reported at the time.

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