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Showing 1 to 20 of 23 for “"mixed mode fracture"”.
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Mixed mode fracture of concrete
The static mixed mode I and II fracture aspects of diagonal tension failure in reinforced concrete and prestressed concrete members were studied using a hybrid experimental-numerical analysis.
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Mixed-Mode Fracture Analysis Using a Conservation Integral
Made available in DSpace on 2014-12-14T14:42:18Z (GMT). No. of bitstreams: 1 8004309.pdf: 3007532 bytes, checksum: 2fdc8dc474fdf2ff2415791cb0c6f960 (MD5) Previous issue date: 1979
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Three-Dimensional Mixed-Mode Fracture of the Four-Point Shear Specimen
Traditionally, fracture testing has focused on the fracture toughness of specimens undergoing pure mode I loading, often simplified by 2D assumptions of plane strain or plane stress. In reality, components have finite-thickness, and often see complex loading configurations. To study this complex …
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Dynamic Mixed-Mode Fracture of Bonded Composite Joints for Automotive Crashworthiness
An experimental evaluation of the mixed-mode fracture behavior of bonded composite joints is presented. Commonly used experimental techniques for characterizing the mode I, mixed-mode I/II, mode II, and mode III fracture behavior have been employed for the purpose of developing a fracture envelope …
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Characterization of Mixed-Mode Fracture Testing of Adhesively Bonded Wood Specimens
… the critical strain energy release rates (G) for mixed-mode (I/II) fracture of wood adhesive joints. The aims of the study were: (1) quantifying the fracture properties of two material systems, (2) analyzing the aspects that influence the fracture properties of bonded wood, (3) refining test …
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Experimental and Numerical Methods for Characterizing the Mixed-Mode Fracture Envelope for a Tough Epoxy
… This work explores the quantification of fracture energy for PR-2930 bonded joints. Fracture can occur in one of three different modes, or in some combination. Many practical adhesive joints fail in the mixed-mode region involving both opening (mode I) and shearing (mode II) displacements. …
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Investigation into the Effect of Physical Size on Crack Initiation in Brittle Materials Subject to Mixed Mode Fracture (With Focus on Graphite Nuclear Reactor Cores)
… scenarios with a view to determining a suitable fracture prediction criterion for advanced gas-cooled reactor (AGR) graphite bricks. In this context size effect is taken to mean the non-constant nature of material properties when specimens are tested at different sizes. The literature shows that …
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Fracture of Asphalt Concrete: A Cohesive Zone Modeling Approach Considering Viscoelastic Effects
… that exhibits time and temperature dependent fracture behavior. Softening of the material can be associated to interlocking and sliding between aggregates, while the asphalt mastic displays cohesion and viscoelastic properties. To properly account for both progressive softening and …
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An anisotropic displacement correlation method for extraction of stress intensity factors from three-dimensional fractures
… 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 material alignment. A high-order generalized finite element …
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Experimental investigation of tearing fracture in sheets under quasi-static loading
… trousers- type test. By using the trousers-type fracture test the overall plastic bending kinematics of the fractured petal is preserved, as well as the mixed mode (mode one and mode three) fracture. Through analytical and qualitative analysis, a testing apparatus to generate this trousers-type, …
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Using far-field measurements for determining mixed-mode interactions at interfaces
… interactions at a bimaterial interface during fracture and adhesion. The goal of this work is to develop a direct method to extract mixed-mode TSRs using only the far-field measurements. The first topic of the dissertation deals with extracting mixed-mode TSRs based on a combination of global …
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Crack Path Predictions Under Mixed Mode Loading In Aero-Structures: Measurements and Analysis
… combination of tension and torsion, resulting in mixed mode loading of flaws. When subjected to such conditions, the flaw is likely to undergo stable crack growth (SCG) in ductile materials. Understanding such fracture events in ductile materials is an important component of structural integrity …
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Potential-Based Fracture Mechanics Using Cohesive Zone and Virtual Internal Bond Modeling
… of nonlinear constitutive relationships along fracture surfaces is a fundamental issue in mixed-mode cohesive fracture simulations. A generalized potential-based constitutive theory of mixed-mode fracture is proposed in conjunction with physical quantities such as fracture energy, cohesive …
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Investigation of Toughening Mechanisms in the Fracture of Asphalt Concrete Using the Clustered Discrete Element Method
… of solid inclusions and a viscous matrix. The fracture of heterogeneous solids is a difficult problem to handle numerically due to the creation and continuous motion of new surfaces. A clustered discrete element method (DEM) is employed as a means to investigate fracture mechanisms in asphalt …
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Degradation and Failure Analysis of Environmental Barrier Coatings under Adverse Operating Environment: Multi-Physics Modelling
… temperature fields were implemented into the EBC model, aiming to simulate the system's in-service conditions. Coupled thermo-mechanical processes were simulated, incorporating high-temperature creep behavior, phase transformation from Yb₂Si₂O₇ to Yb₂SiO₅, and TGO growth kinetics. The model also …
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Fracture of a Model Functionally Graded Material Manufactured From a Photo-Sensitive Polyethylene
In this experimental investigation the fracture behavior of functionally graded materials (FGMs) was studied by means of fracture experiments carried out on model polymer-based FGMs. Model graded materials were manufactured by selective ultraviolet irradiation of ECO [poly(ethylene carbon …
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Multiscale characterization of mechanical and fracture properties of cortical bone specimens
… to a whole bone at the macroscale. Several fracture testing methods are available including the three-point bending test, the compact tension test and the double cantilever test. However, these methods are confined to the macroscopic scale. At the microscopic scale, Vickers Fracture …
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Fracture mechanics and its application in rock excavation
… two chevron notched specimen geometries for rock Mode I fracture toughness measurement, CB and SR, recommended by the ISRM have several disadvantages, such as very low loads required to initiate failure, complicated loading fixtures, difficult to be developed for rock mixed mode fracture testing, …
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Crack Path Selection in Adhesively Bonded Joints
… (DCB) specimens are prepared and tested under mixed mode fracture conditions in this study. Post-failure analyses conducted on the failure surfaces indicate that the failure tends to be more interfacial as the mode II component in the fracture increases whereas more advanced surface preparation …
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Analytical Modeling of the Mechanics of Nucleation and Growth of Cracks
With the traditional fracture mechanics approaches, an initial crack and self-similar progression of cracks are assumed. In this treatise, theoretical and numerical tools are developed to mathematically describe non-self-similar progression of cracks without specifying an initial crack. A …
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