Research Investigation on Strain Analysis of Metal Sheets with Notches and Cracks PDF Download
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Author: G. U. Oppel Publisher: ISBN: Category : Aluminum alloys Languages : en Pages : 92
Book Description
The report presents experimental observations and measurements concerning the strain distribution and changes of the strain distribution at the base of semi-circular notches and at the base of cracks in thin flat metal sheets. The metal sheets were subjected to static and to fluctuating tensile loading. The photoelastic coating method and a method utilizing Newton interference fringes were used to perform the stain observations and measurements. With both methods applied to semi-circular notches, a so-called necking zone could be observed. It was found that the necking zone must have a certain magnitude before cracks are formed at the base of the notch. New details concerning the geometry and magnitude of the strain distribution and its changes were also observed at the base of cracks in thin metal sheets using the interferometric method. To the best of the author's knowledge, this is the first time that this method has been applied to strain analysis around cracks in metal. The residual and total strain distribution, for static loading, at the base of cracks were obtained thusly. Data on the rate of crack propagation and its relationship to the varying areas of permanent deformation around cracks have also been recorded. (Author).
Author: G. U. Oppel Publisher: ISBN: Category : Aluminum alloys Languages : en Pages : 92
Book Description
The report presents experimental observations and measurements concerning the strain distribution and changes of the strain distribution at the base of semi-circular notches and at the base of cracks in thin flat metal sheets. The metal sheets were subjected to static and to fluctuating tensile loading. The photoelastic coating method and a method utilizing Newton interference fringes were used to perform the stain observations and measurements. With both methods applied to semi-circular notches, a so-called necking zone could be observed. It was found that the necking zone must have a certain magnitude before cracks are formed at the base of the notch. New details concerning the geometry and magnitude of the strain distribution and its changes were also observed at the base of cracks in thin metal sheets using the interferometric method. To the best of the author's knowledge, this is the first time that this method has been applied to strain analysis around cracks in metal. The residual and total strain distribution, for static loading, at the base of cracks were obtained thusly. Data on the rate of crack propagation and its relationship to the varying areas of permanent deformation around cracks have also been recorded. (Author).
Author: Volker Weiss Publisher: ISBN: Category : Ceramic materials Languages : en Pages : 72
Book Description
The effects of non-uniform stress distributions on fracture strength were studied on four mate rials that exhibit brittle behavior; Wesgo AL995, Mykroy 750 and 1100 (ceramics) and Plexiglas (acrylic plastic). Analysis of the results of both notch tensile and bend tests on these materials indicate that fracture in ceramic materials can be explained by a maximum fracture stress concept provided that the inherent inhomogeneity of these materials is considered in the analysis. Weibull's statistical theory of fracture appears to be ap plicable to the analysis of inhomogeneity. The be havior of Plexiglas is similar to that previously observed for high strength metals. Studies of plastic flow in metallic flat notch tensile speci mens indicate that the distribution of the princi pal longitudinal strain across the notch section is related to the distribution of the longitudinal elastic stress raised to the power b, where b is primarily a function of the strain hardening ex ponent of the material. Also, Neuber's conclusion that K sub t represents the geometric mean of the true stress and true strain concentration factors in pure shear seems generally applicable to the plane stress tension case.
Author: G. U. Oppel
Author: G. U. Oppel
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Author: United States. National Aeronautics and Space Administration
Author: Volker Weiss
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Author: United States. National Aeronautics and Space Administration
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