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Showing 1 to 18 of 18 for “"Stress Intensity Factor (SIF)"”.
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A combined experimental and stochastic finite element analysis methodology for the probabilistic fracture behavior of composite laminates
… predict the stochastic characteristics of the Stress Intensity Factor (SIF) and the Strain Energy Release Rate (G) of composite laminates, is developed. Using this methodology, the probabilistic fracture analysis of laminated composites is performed. The material and geometric properties of the …
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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.
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Automated design of composite plates for improved damage tolerance
… elastic fracture mechanics for calculating stress intensity factor (SIF) was incorporated in the design cycle. A general purpose mathematical optimization algorithm was used for the weight minimization. Analytical sensitivity derivatives of the SIF, obtained by employing the adjoint variable …
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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 …
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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 …
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Finite element analysis of combined fracture and delamination on coated substrate under normal and tangential loading
… (COF), were studied to analyse the effect on stress distributions, fracture behaviour and combined fracture and delamination failure. Stress intensity factor (SIF) technique is used to predict unstable crack propagation and cohesive element method (CZM) was developed to predict delamination in …
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Experiments for Evlauating 3-D Effects on Cracks in Frozen Stress Models
… rationale. Results show that the normalized stress intensity factor (SIF) for the V-cut case are at least equal to, but in most cases are greater than, the natural crack cases. These results were compared to experimental results from Smith and his associates for motor grains having similar …
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Effect of Galvanic Corrosion on Crack Propagation of Cold Expanded Holes in AA2024-T3
… discontinuity in the material leading to a local stress concentration under loading. Cold expansion is a well-known technique with a wide range of applications in both new and repaired structures. The benefits include the extension of fatigue life and a delay in crack growth without addition of …
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Stochastic J-integral and realiability of composite laminates based on a computational methodology combining experimental investigation, stochastic finite element analysis and maximum entropy method
… approach, the fracture parameters including the Stress Intensity Factor (SIF), the Energy Release Rate (ERR) and the J -Integral have been determined based on the experimental data for the properties of the composite material. The material parameters and the fracture parameters have been …
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Hydraulic fracturing through 3D printing and lattice modelling
… The work involves the correlation between the stress intensity factor (SIF) and spring deformation, the influence of the particle size on fracture toughness, and the relationship between the micro-spring failure and critical SIF. Following this, a damage-plasticity model was developed and …
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Study of layer orientation on the fracture behavior of two additively manufactured thermoset resins, A
… square fit to extract the evolving critical stress intensity factor (SIF) leading to fracture initiation. These results are compared to quasi-static experiments of the same material and similar geometries on a standard load frame. Findings suggest that the print orientation does slightly …
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Study of surface cracks in a simulated solid rocket propellant grain with an internal star perforation
… propulsion system. Due to its complex geometry, stress concentrations are inevitably present around the highly curved area. Furthermore, this geometric effect together with various loading conditions throughout the grain's service life actually causes numerous defects inside its body. However, …
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Solving three-dimensional problems in natural and hydraulic fracture development : insight from displacement discontinuity modeling
… paths. Fracture propagation is controlled by stress intensity factor (SIF) and its determination plays a central role in LEFM. The DD modeling is used to evaluate SIF in Mode I, II and III at the tip of an arbitrarily-shaped embedded crack by using crack-tip element displacement discontinuity. …
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Modeling Compressive Stress Distributions at the Interface between a Pallet Deck and Distribution Packaging
… developing predictive models of the compressive stress distributions using the principle of the beam on an elastic foundation and experimentally quantifying the compressive stress distributions. The overall objective of this study is to develop a model that predicts compressive stress …
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Fracture mechanics analysis of offshore wind turbine monopile structures for lifetime extension
… mechanics. It requires the calculation of stress intensity factor (SIF) which is a function of structure geometry, crack geometry and the applied load. The SIF can be obtained from handbook solutions for simple cases or by finite element analysis for complex cases. However, SIF by finite …
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Fracture in polycrystalline diamond. Investigating cracking and toughness behaviour using a miniature double torsion technique
… non-contact characterization of the surface stress intensity around the propagating crack. In addition to the abovementioned techniques, electron backscatter diffraction (EBSD) was employed to investigate the effect of the microstructural features on the behaviour of the various grades of …
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Numerical Simulation of Adiabatic Shear Bands and Crack Propagation in Thermoviscoplastic Materials
… The validated code is then used to analyze the stress intensity factor (SIF) in a double edge-cracked plate. Deformations of the plate are studied both with and without exploiting the symmetry conditions. The penalty method is used to enforce the essential boundary condition in the former case. …
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An Environmental and Durability Study of Bonded Structural Patch Repairs with Finite Element and Machine Learning Enabled Predictions
… substantial structural and aerodynamic stresses over their operational lifetimes. These stresses can cause damage or structural weakening, especially in aging military and civilian aircraft and vehicles. Depending on the severity of the damage, three options are available to alleviate …