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- W2942458045 abstract "In this thesis, the ratchetting behavior of piping elbows is studied by using the nonlinear isotropic/kinematic hardening model under conditions of steady internal pressure and dynamic out-of-plane bending moments at frequencies typical of seismic excitations. These loads are the cause of plastic strain and ratchetting in piping elbows and ratcheting can lead to failure of components through cracking or plastic buckling. Elbows material under test are both stainless steel and carbon steel. Material parameters have been obtained with innovative method from stabilized cycles of specimens under symmetric strain cycles. Finite element code with ABAQUS software, was used for three dimensional simulation of elbow and evaluation of Combined hardening model. Ratchetting strain rates are much more in the first cycles and decreases with increasing time. The cyclic strain accumulation against response moment for each component is assessed and ratios of applied to limit moment at onset of ratcheting are given for each material. Also, by comparing the results of numerical method with experimental available results, for low and intermediate moments in numerical method we can see acceptable adaptation with experimental results. But for high moments, the result of numerical method comparison with experimental method is over estimated. The results show that, the direction of highest ratcheting is along the hoop direction rather than the direction of maximum principal strain. While there is practically no strain accumulation in the axial direction." @default.
- W2942458045 created "2019-05-03" @default.
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- W2942458045 date "2015-01-01" @default.
- W2942458045 modified "2023-09-26" @default.
- W2942458045 title "Evaluation of Combined Hardening Model in Strain Accumulation of Pressurized Piping Elbows under Dynamic Out-of-Plane Bending" @default.
- W2942458045 hasPublicationYear "2015" @default.
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