Stress intensity factor
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The mode I and mode II fracture behavior of a single-layer graphene sheet (SLGS) containing a center crack was characterized with the results of an finite element method (FEM) and an analytical model. Finite element method based micromechanical analysis is used to understand the fracture behavior of functionally SLGS.
7p vidoctorstrange 06-05-2023 9 2 Download
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An improved six-node triangular finite element based on a twice-interpolation strategy (TIS) for accurately modeling singular stress fields near crack tips of two-dimensional (2D) cracks in solids is presented. In contrast to the traditional approaches, the approximation functions constructed based on the TIS involve both nodal values and averaged nodal gradients.
9p vidoctorstrange 06-05-2023 3 2 Download
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A phantom node method is developed for problems discretized by 4-node quadrilateral elements to describe arbitrary cracks. By overlapping elements at the position of the crack, the method may treat cracks independently of the mesh.
8p vidoctorstrange 06-05-2023 4 2 Download
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The model showed matching results for all duplex oxide combinations in varying stress, but the inner logarithmical oxide gave higher crack growth rates than the power law. The power law with the thicker inner oxide showed good results for the change of stress intensity factor and gave the best results when the yield stress was varied. Grain misorientation effect was higher for the duplex oxides with thicker outer oxides.
16p guernsey 28-12-2021 6 0 Download
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This paper reports the application of consecutive-interpolation procedure into four-node quadrilateral elements for analysis of two-dimensional cracked solids made of functionally graded composite plate. Compared to standard finite element method, the recent developed consecutiveinterpolation has been shown to possess many desirable features, such as higher accuracy and smooth nodal gradients it still satisfies the Kronecker-delta property and keeps the total number of degrees of freedom unchanged.
11p nguaconbaynhay11 07-04-2021 20 1 Download
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Positive-pressure mechanical ventilation is essential in assisting patients with respiratory failure in the intensive care unit and facilitating oxygenation in the operating room. However, it was also recognized as a primary factor leading to hospital-acquired pulmonary dysfunction, in which pulmonary oxidative stress and lung inflammation had been known to play important roles.
17p vimaine2711 26-03-2021 14 3 Download
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Since the recent past, intensive shrimp culture has become widely spread and applied because of the diminishing farming land and to regulate proper discharge/processing of wastewater for monitoring environmental conditions. These systems tend to culture shrimps at high stocking density which is one of the most important factor in shrimp culture, and bear the potential to influence growth and survival of shrimp due to the stress response induced by crowding.
10p caygaocaolon6 30-07-2020 7 1 Download
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An in-house finite element code was utilized to evaluate mode I/II stress intensity factor (SIF) of an edge cracked semi-circular disc subjected to three-point bending.
12p tohitohi 19-05-2020 13 0 Download
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The linear elastic analysis of homogeneous, isotropic cracked bodies started in the 1900s. The existence of three dimensional corner point effects in the vicinity of a corner point where a crack front intersects a free surface was investigated in the late 1970s. An approximate solution by Bažant and Estenssoro explained some features of corner point effects but there were various paradoxes and inconsistencies.
10p tohitohi 19-05-2020 18 2 Download
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Mixed mode I/II stress intensity factors of an edge slant-cracked plate under tensile loading were assessed. A two-dimensional finite element analysis was employed using ABAQUS. Various crack lengths and angles were analyzed. The effect of the crack location at the plate edge was also examined. Crack initiation angles were calculated.
10p tohitohi 19-05-2020 17 1 Download
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Different criteria are available in the literature to assess the fracture behaviour of sharp V-notches. A typical and well-known criterion is based on the application of the notch stress intensity factors (NSIFs), which are able to quantify the intensity of the stress fields ahead of the notch tip.
8p tohitohi 19-05-2020 7 0 Download
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One of the specimens to investigate the mode-I fracture toughness of rock and geo-materials is semi-circular bend (SCB) specimen. In general, initial cracks in rock test specimens are produced in two shapes: straight-edge cracks and chevron notches. The ISRM suggested SCB specimen has straight shaped notch.
10p tohitohi 19-05-2020 7 0 Download
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A new fracture test specimen is suggested and analyzed using finite element method. The mode I and mode II stress intensity factors as well as the T-stress were calculated for three geometries and loading conditions.
6p tohitohi 19-05-2020 13 1 Download
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The curves were developed in a computational manner in terms of the notch stress intensity factors and based on the suitable failure concept of the maximum tangential stress (MTS) utilized frequently in the past by the author and his co-researchers for predicting mixed mode brittle fracture in extensive notched specimens.
20p tohitohi 19-05-2020 10 0 Download
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In this paper, the stress intensity factors (SIFs) for an interfacial notch in a bi-material joint have been calculated using the experimental method of photoelasticity. A bi-material Brazilian disc specimen with a central interface notch was employed to determine the SIFs for different mode mixities.
5p tohitohi 19-05-2020 5 0 Download
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Mode I and mode II stress intensity factors (SIFs) through the thickness of edge crack in semi circular bend (SCB) and center cracked circular disc (CCCD) specimens have been analyzed using three dimensional finite element analysis.
10p tohitohi 19-05-2020 9 0 Download
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Salinity is one of the damaging abiotic stress factor. Proper management techniques have been proposed to considerably lower the intensity of salinity on crop growth and productivity.
12p viharuno2711 21-04-2020 13 1 Download
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The effects of uncertainty factors on SIFs were deducted from sensitivity analyses and, based on the similarity and conservatism compared with detailed finite element analysis results, the R6 code, taking into account the applied internal pressure and combination of stress components, was recommended as the optimum procedure for SIF estimation.
11p minhxaminhyeu5 30-06-2019 8 0 Download
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This work studies the threshold stress intensity factor (KIH) to initiate DHC as a function of temperature in Zry-4 for temperatures between 227C and 315C. The experimental technique used in this study was the pin-loading testing technique. To determine the KIH, an unloading method was used where the load was successively reduced in a stepwise manner until no cracking was observed during 24 hours.
5p minhxaminhyeu4 26-06-2019 11 2 Download
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The research results for radial cracking cases indicate that a better agreement for KIH can be achieved; the negative axial thermal stresses can lessen KIH and enlarge the critical hydride length, so its effect should be considered in the safety evaluation and constraint design for fuel rods; the critical hydride length lC changes slightly in a certain range of stress intensity factors, which interprets the phenomenon that the DHC velocity varies slowly in the steady crack growth stage.
10p minhxaminhyeu3 25-06-2019 13 1 Download