Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 63 for “"Stress Intensity factors"”.
-
Stress intensity factors for ship and offshore structural details
… doubler-plate reinforced joints. Evaluation of stress intensity factor by finite element method has been calibrated against reported numerical and experimental results. For the purpose of standardized and simplified crack mesh generation, an automatic crack mesh generator program has been …
-
Stress intensity factors of edge cracks in dissimilar joint plates
… or crack. Hence, this study will focused on the stress intensity factor on edge crack between dissimilar joint plates. The study focused on the investigation of edge crack behavior of dissimilar joint plates and to find out stress intensity factor (SIF) of dissimilar joint plates under different …
-
A photoelastic technique for the determination of stress intensity factors
A technique for obtaining values of the stress intensity factor from photoelastic data for three dimensional cracked body problems is described. The stress intensity determination is accomplished without resorting to stress separation methods through employing an expression for the maximum in-plane …
-
Stress intensity factors for long, deep surface flaws in plates under extentional fields
… Method (TSCM) was verified for extracting stress intensity factors from photoelastic data. Photoelastic experiments were then conducted on plates with part circular and flat bottomed cracks for flaw depth to thickness ratios of 0.25, 0.50 and 0.75 and for equivalent flaw depth to equivalent …
-
Experimental method of analyzing stress intensity factors and singularity order in rocket motor geometry
A series of frozen stress experiments were conducted on surface flaws of varying aspect ratios in pressurized cylinder with star-shaped cutout in order to study the stress intensity factor distribution along the flaw border and to estimate the loss of the inverse square root singularity when the …
-
Determination of stress intensity factors for cracks emanating from holes in finite thickness plates
The stress freezing photoelastic method is a proven technique for the estimation of stress intensity factors along crack fronts in complex three dimensional problems. Comparisons between previous photoelastic and approximate analytical results have revealed discrepancies in results for the case …
-
A photoelastic technique for the determination of stress intensity factors for Mode III loading
A method for extracting estimates of the stress intensity factors due to Mode III loadings from photoelastic data is developed. The results are supported by a series of stress freezing photoelastic experiments conducted on circumferentially notched round bars to which torsional loads were applied …
-
An anisotropic displacement correlation method for extraction of stress intensity factors from three-dimensional fractures
… correlation method (DCM) for the extraction of stress intensity factors (SIFs) from three-dimensional fractures in anisotropic bodies is presented in this work. The proposed anisotropic DCM is able to handle materials with rectilinear anisotropy in bodies with arbitrary crack geometry and …
-
Computation of Dynamic Stress Intensity Factors by the Time Domain Boundary Integral Equation Method (Crack, Propagating)
… A consistent method of estimation of the dynamic stress intensity factor (SIF) in conjunction with the two types of element is described.
-
A Numerical Based Determination of Stress Intensity Factors for Partially Cracked Flexural I-shaped Cross-sections
… bridge girders have been observed as a result of stress concentrations, design errors, welding quality control, and vehicular impacts. Cracks can grow in size with time and active cyclic live loads and may result in a member fracture. Fracture is a dangerous limit state which occurs with little to …
-
A Photoelastic Investigation into the Effects of Cracks and Boundary Conditions on Stress Intensity Factors in Bonded Specimens
… crack orientations are analyzed to determine stress intensity factors at the induced crack tips. Specimens containing interface and sub-interface cracks were investigated. Two global geometries were used in this investigation, square and rectangular. The constant displacement boundary …
-
Three-dimensional mixed mode linear elastic fracture mechanics analysis using domain interaction integrals
… available finite element package to extract the stress intensity factors and the J-Integral. The results were then compared with those obtained from crack face relative displacements as a post-processing step. The model has been tested on various geometries and the performance of focused and …
-
On iso- and nonisothermal crack problems of a layered anisotropic elastic medium
… with Cauchy-type kernels. The crack·tip stress intensity factors are then defined in terms of the solution of the integral equations. Numerical results are presented addressing the salient and unique features for a class of crack problems involving highly anisotropic fibrous composite …
-
Life prediction of spot-welds: a fatigue crack growth approach
… for spot-welds subject to fatigue loading. Stress intensity factors are used with the Walker equation to develop two crack growth approaches to the problem. The predictions fit data for lap joint configurations well, but not so for peel joint geometries.
-
Stress Intensity Factor Distributions in Bimaterial Systems - A Three Dimensional Photoelastic Investigation
Stress-freezing photoelastic experiments are conducted using two different sets of photoelastic materials to investigate stress intensity behavior near to and coincident with bimaterial interfaces. Homogeneous, bonded homogeneous, and bonded bimaterial single edge-cracked tension specimens are …
-
On the Thermal Stresses Due to a Uniform Heat Flow Past a Circular Hole With a Radial Edge Crack
… in this dissertation is that of finding the stresses in an isotropic, linear, thermoelastic solid when a uniform heat flow is disturbed by the presence of an insulated circular hole with a radial edge crack. By superimposing a Mellin transform solution of the equations of thermoelasticity on …
-
Enrichment of the Boundary Element Method through the Partition of Unity Method for Fracture Analysis using Local and Global Formulations
… techniques used to extract the highly important stress intensity factors - a measure of the singularity of a crack tip. The Boundary Element Method framework is described and later, the implementation of the new technique of enrichment is defined in detail. Finally, several crack problems are …
-
Aplicação do método dos elementos finitos a problemas planos da mecânica de fratura
… fracture is discussed, attempting to obtain the stress intensity factors. In doing so a hybrid displacement finite element model is used. The fundamental concepts and theories of Fracture Mechanics are presented, firstly. Then, a hybrid functional, in which the displacements in the interior and …
-
The dual boundary element method applied to semi-infinite surface cracks in two-dimensions
The goal of his thesis is to evaluate the stress intensity factors (SIF) for surface cracks in semi-infinite solids via the DBEM. We first detail the derivations of the boundary element and dual boundary element methods. The main difficulty with these methods are integrations of the singular …
Page 1 of 4