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Showing 1 to 20 of 97 for “"Intensity factor"”.
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Stress Intensity Factor Distributions in Bimaterial Systems - A Three Dimensional Photoelastic Investigation
… 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 utilized throughout the investigation for comparative purposes. The first series …
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A comparative study of stress intensity factor extraction techniques for the generalized finite element method
… user in a choice of an appropriate mesh. Stress intensity factor is an important quantity in fracture mechanics which is used to predict the stress state around a crack front. This report presents a comprehensive study of stress intensity factor extraction techniques: The Contour Integral Method …
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The effect of riveted and uniformly spaced stringers on the stress intensity factor of a cracked sheet
… and uniformly spaced stringers on the stress intensity actor of a centrally cracked sheet is determined. Also obtained is the force in the critical rivet and stringer. The results are presented for two symmetrical cases of crack location: the crack initiating at a rivet, and the crack …
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A new empirical model to predict stress intensity factor for double interacting surface cracks located in hollow cylinder
… parallel cracks configuration. Stress Intensity Factor (SIFs) has been chosen as the driving force to define the crack interaction. The SIFs have been analyzed for a wide variety of crack geometry, and cylinder type as well as separation distances utilizing finite element software Ansys …
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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 …
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A Photoelastic Investigation into the Effects of Cracks and Boundary Conditions on Stress Intensity Factors in Bonded Specimens
… 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 condition was …
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Stress intensity factors of edge cracks in dissimilar joint plates
… 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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Experimental method of analyzing stress intensity factors and singularity order in rocket motor geometry
… 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 crack border intersects the inner star surface at right angles. By applying a refined optical method, the photoelastic data …
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Molecular Statics Simulation in Aluminum
… dislocation shielding reduce the local stress intensity factor. Also, twinning, which has not been observed experimentally in Aluminum due to the high stacking fault, was obtained in the simulation. Probably, the low temperature facilitates twin formation. The applied stress intensity factor …
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A combined experimental and stochastic finite element analysis methodology for the probabilistic fracture behavior of composite laminates
… 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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Algorithm to enable intelligent rail break detection
Wavelet intensity based algorithm developed previously at VirginiaTech has been furthered and paired with an SVM based classifier. The wavelet intensity algorithm acts as a feature extraction algorithm. The wavelet transform is an effective tool as it allows one to narrow down upon the transient, …
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The effect of phase transformation on fatigue crack growth of shape memory alloys
… tip driven force was characterized by the stress intensity factor due to tractions on the transformation zone surface. Through modeling, it was found that the modification became more significant at the maximum applied load than at the minimum in a single load cycle. The effective stress intensity …
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The fatigue crack growth behavior of superelastic nickel titanium
… martensite phase causes deviations of stress intensity and state at the tip from the classical handbook solutions widely relied on for crack growth characterization. In this work, novel methods of stress intensity factor extraction based on in situ and ex situ Digital Image Correlation are …
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Applicability Of Continuum Fracture Mechanics In Atomistic Systems
… continuum fracture mechanics defines the stress intensity factor K to characterize the stress and displacement fields in the vicinity of the crack tip, thereby developing the relation between the stress singularity and surface energy (energy release rate G). This G-K relation, assigning physical …
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Fracture of Hot-Pressed Silicon Nitride at Elevated Temperatures
… rates. Fracture stress and critical stress intensity factor were calculated and plotted versus temperature for each displacement rate. The scanning electron microscope, transmission electron microscope and scanning Auger electron spectrometer were used to analyze as-received and fractured …
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Fracture Characteristics of Concretes and Cement-Stabilized Soil
… towards the determination of the critical stress intensity factor or fracture toughness of concrete, mortar, or cement paste, failing in tension. Studies on an experimental determination of fracture toughness for concrete subjected to a compressive stress field have limited report so far. This …
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Morphology Development and Fracture Properties of Toughened Epoxy Thermosets
… with cure temperature, the critical stress intensity factor did not vary significantly with cure temperature as expected. However, increases in cure temperature produced smaller but more numerous particles. The critical stress intensity factor normalized by the number density of particles …
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ΑΝΑΓΩΓΗ ΠΡΟΒΛΗΜΑΤΩΝ ΛΩΡΙΔΑΣ ΜΕ Η ΧΩΡΙΣ ΕΝΙΣΧΥΣΕΙΣ, ΣΕ ΕΠΙΛΥΣΗ ΙΔΙΟΜΟΡΦΩΝ ΟΛΟΚΛΗΡΩΤΙΚΩΝ ΕΞΙΣΩΣΕΩΝ
WE FIND THE STRESS INTENSITY FACTOR FOR A CRACKED STRIP WITH A HOLE AND ALSO THE STRESS CONCENTRATIONS. WE FACE THE PROBLEM OF A DISLOCATION IN TWO STRIPS WHICH ARE MADE FROM DIFFERENT MATERIALS . WE SOLVE ALSO THE PROBLEM OF A DISLOCATION IN A STRIP WITH STIFFNERS FROM BOTH SIDES WHICH ARE MADE …
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Experimental determination of stress intensities and crack shapes associated with the nozzle corner crack problem
… results in the form of crack shapes and stress intensity factor distributions. Results of the current study are compared with alternate methods and different phases of the same problem. A discussion of the variational material behavior around the flaw border is also included. The applicability …
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Effect of oxygen potential on high temperature crack growth in alloy 617
… 650°C. Tests were conducted at a constant stress intensity factor, K, for static loading conditions or constant AK for fatigue loading using a direct current potential drop measurement system to measure crack length. The oxygen concentration was measured on both the outlet of the test retort as …
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