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Brittle failure criteria for components containing U-notches under Mode I loading
Engineering Fracture Mechanics, 2018Abstract In this study, a modified fracture criterion which satisfies the necessary stress and energy conditions is proposed for brittle materials. The criterion is based on the assumption that fracture is generated by the initiation of a crack with a finite length l cm . In the proposed criterion, it is assumed that the crack length
Dai-Heng Chen +2 more
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Assessment of UMTS and Averaged SED Fracture Criteria for U-Notched Specimens
Key Engineering Materials, 2013A set of mixed-mode I/II fracture tests was carried out on a polyurethane material. Using a single edge notched bend (SENB) type specimen, containing straight and respectively inclined U notches, the full range from pure mode I to dominant mode II was achieved. Two different fracture criteria were employed for the prediction of the fracture conditions:
Hannelore Filipescu +2 more
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Safety Factor of a U-Notched Plate
2003Figure 1 shows a rectangular aluminium plate containing a single U-notch. The plate is subjected to cyclic loading at a stress ratio of R=0. The fatigue limit (at R=0) is 220 MPa. Determine the maximum peak stress for the plate to maintain a safety factor of 1.5 under fail safe conditions. The dimensions of the plate are shown in Figure 1.
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Understanding the failure of epoxy resin U-notched samples using cohesive models
Theoretical and Applied Fracture Mechanics, 2019The critical distances theory for predicting failure loads of notched solid polymers requires assuming very high values of the characteristic stress. These values have to be much higher than the nominal tensile strength without a reasonable explanation.
Serrano, Ana +3 more
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Fracture of U-notched specimens under mixed mode: Experimental results and numerical predictions
Engineering Fracture Mechanics, 2009The first part of the paper gives an account of 153 fracture tests on blunted notched specimens (with notches of root radius ranging from 0.3 to 4.0 mm), loaded under mixed mode (ranging from almost pure mode I to mode II, and beyond). Maximum loads and initial crack angles were measured as a function of notch root radius and loading mixity.
F. J. G??mez +3 more
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Pure shear fracture study in a brittle graphite material containing a U-notch
International Journal of Damage Mechanics, 2013A disc-type specimen containing a central bean-shaped slit, called the U-notched Brazilian disc specimen, was utilized to measure experimentally the mode II notch fracture toughness of a type of commercial polycrystalline graphite. First, 24 U-notched Brazilian disc graphite specimens were fabricated for four different notch tip radii, and the ...
AR Torabi, M Fakoor, MA Darbani
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A criterion for brittle fracture in U-notched components under mixed mode loading
Engineering Fracture Mechanics, 2009Abstract A failure criterion is proposed for brittle fracture in U-notched components under mixed-mode static loading. The criterion, called UMTS, is developed based on the maximum tangential stress criterion and also a criterion proposed in the past for mode I failure of rounded V-shaped notches [Gomez FJ, Elices M.
M.R. Ayatollahi, A.R. Torabi
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The influence of dielectric constant on bandwidth of U-notch microstrip patch antenna
2010 IEEE International Conference on Ultra-Wideband, 2010A rectangle patch antenna with U-notch is a practical method to improve the bandwidth of microstrip antennas bandwidth. If special material substrate and add matching network are combined, which not only reduce the quality factor of antenna, but also produce maximum output power for little reflection of load.
Linxi Zhang, Qi Zhang, Chufeng Hu
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Effect of hydrogen on four-point bend tests of U-notched AISI 1090 steel
Metallurgical Transactions A, 1987U-notched, four-point bend tests of 1090 steel were performed in the, presence or absence of precharged hydrogen. Failure occurred in a mode II manner under mixed mode I–II loading, with cracking preceded by plastic instability in the form of surface rumpling and shear localization.
V. B. Rajan, J. P. Hirth
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Understanding the Deformation Micro-mechanism in Ti–6Al–4V Alloy U-Notched Specimen
2020High strength-to-low weight ratio, corrosion resistance, and excellent mechanical properties make the Ti–6Al–4V alloy a favorable material for aerospace application. In this study, digital image correlation (DIC) techniques together with the electron back scatter diffraction (EBSD) were employed to understand the deformation micro-mechanism. A uniaxial
Hitarth Maharaja +4 more
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