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Showing 1 to 20 of 95 for “"stress intensity factor"”.
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Stress Intensity Factor Distributions in Bimaterial Systems - A Three Dimensional Photoelastic Investigation
Stress-freezing photoelastic experiments are conducted using two different sets 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 …
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A comparative study of stress intensity factor extraction techniques for the generalized finite element method
… to the 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 …
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The effect of riveted and uniformly spaced stringers on the stress intensity factor of a cracked sheet
… of riveted 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
… and non-coplanar 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 …
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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
… crack 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 …
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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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Experimental method of analyzing stress intensity factors and singularity order in rocket motor geometry
A series of frozen stress experiments were conducted on surface flaws of varying aspect ratios in pressurized cylinder with 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 …
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Molecular Statics Simulation in Aluminum
… and the 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 …
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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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The effect of phase transformation on fatigue crack growth of shape memory alloys
… crack 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 …
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The fatigue crack growth behavior of superelastic nickel titanium
… continues to elude the scientific community: The stress induced 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 …
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Applicability Of Continuum Fracture Mechanics In Atomistic Systems
<p>By quantitating the amplitude of the unbounded stress, the 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 …
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Fracture of Hot-Pressed Silicon Nitride at Elevated Temperatures
… point bend at three displacement 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 …
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Fracture Characteristics of Concretes and Cement-Stabilized Soil
… 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 paste, failing in tension. …
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Morphology Development and Fracture Properties of Toughened Epoxy Thermosets
… not change 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 …
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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
The method of stress freezing photoelasticity has been applied to a phase of the nozzle corner crack problem yielding 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 …
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Effect of oxygen potential on high temperature crack growth in alloy 617
… at 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 …
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Crack Detection in Aluminum Structures
… and to associate these with the NDE method of stress intensity factors. By examining these methods the goal is to try and answer some of the important questions in SHM process. The first is to experimentally validate a crack model and to see how small of a crack can be detected by vibration …
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