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Showing 1 to 20 of 55 for “"Linear Elastic Fracture Mechanics"”.
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Applicability of Linear-Elastic Fracture Mechanics to Portland Cement Concretes
Made available in DSpace on 2014-12-12T00:25:48Z (GMT). No. of bitstreams: 1 7212310.pdf: 2726486 bytes, checksum: 2b221357a2fb6c26df19ec4d36ae19d0 (MD5) Previous issue date: 1971
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A New Singular S-FEM For The Linear Elastic Fracture Mechanics
… has been proposed in this dissertation for the linear elastic fracture mechanics problems in both two and three dimensional spaces. A softer model than that of FEM has been developed by using strain smoothing technique on a set of non-overlapping and no-gapping linear elements. Using the S-FEM, …
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Three-dimensional mixed mode linear elastic fracture mechanics analysis using domain interaction integrals
Three-dimensional mixed-mode linear elastic fracture mechanics analysis is presented using domain interaction integrals. An out-of-plane sinusoidal crack was analyzed using a commercially available finite element package to extract the stress intensity factors and the J-Integral. The results were …
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Linear elastic fracture mechanics in anisotropic solids : application to fluid-driven crack propagation
Fracture mechanics is a field of continuum mechanics with the objective to predict how cracks initiate and propagate in solids. It has a wide domain of application. While aerospace engineers want to make sure a defect in a structure will not grow and possibly lead to failure, petroleum engineers …
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J-integral Computations for Linear Elastic Fracture Mechanics in h,p,k Mathematical and Computational Framework
… for computations of the J-integral for mode I linear elastic fracture mechanics in h,p,k mathematical and computational framework using finite element formulations based on the Galerkin method with weak form and the least squares process. Since the differential operators in this case are …
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Notched strength analysis of tensile specimens taken from a thick, filament-wound graphite/epoxy pressure vessel
… notches depended on the size of the notch. The fracture toughness of the laminate was found by applying a general fracture-toughness parameter approach. Using this value, several approaches were employed to predict failure loads. The accuracy of the approaches depended on the size of the …
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Crack Initiation Analysis in Residual Stress Zones with Finite Element Methods
… nearly untapped research area of the analysis of fracture mechanics in residual stress zones. This type of research has become more prevalent in the field in recent years due to the increase in prominence of residual stress producing processes. Such processes include additive manufacturing of …
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Preliminary investigation into the cracking of polyurethane
… inverse square root singularity used in Linear Elastic Fracture Mechanics (LEFM) is lost as a crack intersects a stress free surface. As a result, the stress and displacement equations are given as eigenvalue series expansions, with the lowest order eigenvalue dominating the series. The …
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Fracture Characteristics of Concretes and Cement-Stabilized Soil
Application of fracture mechanics to the cracking and failure of concrete under stress has been receiving considerable attention. Most of these investigations have been directed towards the determination of the critical stress intensity factor or fracture toughness of concrete, mortar, or cement …
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Elastic and time dependent matrix cracking in cross-ply composite laminates
… of stress level were performed for the case of linear elastic materials. The predictions were based on energy methods and linear elastic fracture mechanics. Damage was simulated with a Monte Carlo numerical scheme. The predicted results corresponded well with experimental data in the literature. …
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Automated design of composite plates for improved damage tolerance
… A strain based criterion was used to obtain fracture toughness of cracked plates under tension. Results of an experimental investigation of the effects of simulated through-the-thickness cracks on the buckling, postbuckling, and failure characteristics of composite flat plates are presented. …
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Impact of Uncertainties on Structures Damage Tolerance Parameters
… of aerospace structural integrity. Traditional fracture control methods, such as damage tolerance analysis (DTA), assume deterministic factors, considering uncertainties inherent in material properties, inspections, and operational conditions only at the final stage by applying safety factors. …
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Development of a generalized fatigue assessment approach for steel castings.
… the fatigue performance of steel castings using linear elastic fracture mechanics (LEFM) analysis. This is a research effort to address issues common in the casting industry, as current fatigue assessment approaches can be too conservative leading to overdesigned parts and the use of …
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Mode I Delamination Fracture Characterization of Polymeric Composites under Elevated Temperature
… experimental methodologies that are based on linear elastic fracture mechanics are inadequate to characterize delamination fracture properties under elevated temperature when PMC properties become time-, loading-history, and rate-dependent. A new experimental methodology based on linear …
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Reliability-based optimization of rail inspection
… and on field data. A crack size is predicted by linear elastic fracture mechanics (LEFM). The proposed method identifies the time-varying rail reliability due to deterioration, using data obtained from LEFM and from first-order reliability methods (FORM), which consider the uncertainty regarding …
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Modeling recycled aggregate concrete crack by extended finite element method and concrete damage plasiticity
… of using an extended finite element with both linear elastic fracture mechanics and cohesive segment approaches are discussed as well.
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A geometric method of fatigue SCF and fracture SIF assessment
… marine structural design, the fatigue life and fracture prediction of local connection details of the vessel is necessary. The traditional empirical rules or numerical work has considerably advanced the qualitative and quantitative understanding of fatigue and fracture analysis. Compared with …
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A continuum theory with long-range forces for solids
… macroscopic model and used to simulate brittle fracture. If the internal length of the simulated peridynamic body is small compared to its macroscopic dimensions, then the simulation results agree well with linear elastic fracture mechanics. In contrast to classical fracture mechanics, however, …
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Modeling of nano-scale fracture mechanisms in a graphene sheet using the atomistic j-integral
… penalty and improve their strain to failure and fracture toughness. This thesis aims at studying these length scale effects in nano-fillers, identifying the existence of a lower bound on flaw-size that marks the transition from brittle fracture to strength-based failure in nanocomposites, …
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