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Showing 1 to 16 of 16 for “"Crack Paths"”.
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Machine learning predictions of crack paths in brittle and ductile media
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms
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Phase-field modeling of fracture: regularization length insensitivity and mixed mode ductile fracture
Predicting crack nucleation and propagation in materials is of critical importance in designing structural components. Due to the cost, time, and occasional impossibility of performing fracture experiments, computational approaches have become instrumental to understand and assess fracture and …
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Phase-field modeling of fracture: regularization length insensitivity and mixed mode ductile fracture
Predicting crack nucleation and propagation in materials is of critical importance in designing structural components. Due to the cost, time, and occasional impossibility of performing fracture experiments, computational approaches have become instrumental to understand and assess fracture and …
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Fatigue crack propagation in functionally graded materials
Propagation of cracks in functionally graded materials (FGMs) under cyclic loading was investigated via experiments and finite element (FE) analysis. Alumina-epoxy composites with an interpenetrating-network structure and tailored spatial variation in composition were produced via a multi-step …
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The edge flaking of tungsten carbide hardmetal cermets under repetitive impact loading
… the geometry and characteristics of the crack propagation glass was impacted. Various types of cracking are observed in the glass including crushing, lateral cracking, median cracking and Hertzian cone cracking. The results of the glass impacting were then compared with those observed in …
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Multiscale mechanical studies of nacre from gastropod mollusk Trochus Nilocitus
(cont.) revealed jagged and branched crack fronts at plate interface, tortuous crack paths, non-uniform angles of polygons (suggesting possible intrinsic deformability and displacement/sliding). The technique of nanoindentation was carried out on individual aragonite tablets using a diamond-coated …
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Understanding the correlation between wrinkle morphology, fracture and fatigue of plain woven CFRP laminates through mechanical and ultrasonic characterization.
… wrinkles. This enhancement was attributed to crack deflection and increased fracture surface area due to the wrinkled interface. The second phase of the research extended this understanding to Mode II conditions by evaluating both static and fatigue-driven crack propagation in specimens with …
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Crack path selection in microstructurally tailored inhomogeneous polymers
… that can help us experimentally study crack path selection problems. The model material which we are using is a polyethylene co-polymer, ECO, whose photosensitive behavior allows alterations in its mechanical properties when subjected to ultraviolet (UV) irradiation. It is seen that ECO …
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A Mesh Objective Algorithm for Modeling Mode-I Cracks Using a Standard Finite Element Formulation
… mesh objective algorithm for modeling mode-I cracks is developed and implemented within a standard finite element formulation. The algorithm applies the crack opening displacements across the standard nodal degrees of freedom that is consistent with formalism of the conventional smeared crack …
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Analytical study of computer vision-based pavement crack quantification using machine learning techniques
… and evaluate important surface defects, such as cracks, using an automated computer vision-based system to provide a better understanding of the pavement deterioration process. To achieve this objective, an automated crack-recognition software was developed, employing a series of image processing …
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Effect of thermal and mechanical loadings on the degradation and failure modes of APS TBCs
… which were distinguished by the particular crack paths on which spallation of the coating had occurred and which were more or less activated by the respective load components. The corresponding damage mapping has been developed and is presented in this thesis. The deformation mechanisms and …
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Self-healing of delamination damage in glass/epoxy composites using catalyst functionalized fibers
… DCPD and the surrounding materials. Tortuous crack paths limit interfacial fiber/matrix de-bond required to expose the catalyst coated fiber surface and also introduce crack blunting mechanisms that increase virgin critical strain energy release rates. In later work, optimization of the fiber …
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Crack Path Selection in Adhesively Bonded Joints
… is to obtain an overall understanding of the crack path selection in adhesively bonded joints. Using Dow Chemical epoxy resin DER 331® with various levels of rubber concentration as an adhesive, and aluminum 6061-T6 alloy with different surface pretreatments as the adherends, both symmetric …
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Finite element simulation of stress evolution in thermal barrier coating systems
… stresses via creep and plastic deformation and crack resistance. In this work, experimental data of thermo-mechanical properties of CMSX-4, MCrAlY (Bond Coat) and APS-TBC (partially stabilized zirconia), were implemented into an FE-model in order to simulate the stress development at the …
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Analysis and Design of Fiber Reinforced Polymer Retrofit of Reinforced Concrete Diaphragms
… diaphragm shear response, including concrete cracking, stiffness degradation, crushing, reinforcement yielding and rupture, and orthotropic FRP behavior. In addition, concrete-FRP bond behavior was modeled using a traction–separation law, enabling accurate simulation of FRP debonding and …
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Spacetime damage-based cohesive model for elastodynamic fracture with dynamic contact
… stick and slip conditions in the event of crack closure. Beyond ensuring solution accuracy, the model uses the SDG scheme's adaptive meshing capabilities to freely nucleate and extend cohesive interfaces to capture solution-dependent crack paths. The SDG adaptive meshing aligns the …