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1-3 of 3
Ashok Saxena
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eBook Chapter
Series: ASME Press Select Proceedings
Publisher: ASME Press
Published: 2017
ISBN: 9780791861387
Abstract
Maximum storage pressures in steel vessels for hydrogen containment can potentially be doubled by incorporating hoop wraps using high strength steel wires coupled with autofrettage. An integrity analysis for Type II pressure vessels consisting of liners made from SA372 grade J steel and hoop wrapped with high strength steel wire is presented. Fatigue crack growth rates were measured in liner material in 10 MPa gaseous hydrogen at load ratios, R, in the range -1 ≤ R ≤ 0.2 using single edge crack tension specimens. Growth rates under negative load ratios were comparable to the rates at low positive load ratios. These results are used to compare design lives and durability of cylinders in hydrogen and in air environments.
Journal Articles
Article Type: Research Papers
J. Eng. Mater. Technol. April 2011, 133(2): 021013.
Published Online: March 21, 2011
Abstract
Creep deformation and rupture experiments are conducted on samples of the Ni-base superalloy directionally solidified GTD-111 tested at temperatures between 649 ° C and 982 ° C and two orientations (longitudinally and transversely oriented). The secondary creep constants are analytically determined from creep deformation experiments. The classical Kachanov–Rabotnov model for tertiary creep damage is implemented in a general-purpose finite element analysis (FEA) software. The simulated annealing optimization routine is utilized in conjunction with the FEA implementation to determine the creep damage constants. A comparison of FEA and creep deformation data demonstrates high accuracy. Using regression analysis, the creep constants are characterized for temperature dependence. A rupture prediction model derived from creep damage evolution is compared with rupture experiments.
Proceedings Papers
Proc. ASME. MICRONANO2008, 2008 Second International Conference on Integration and Commercialization of Micro and Nanosystems, 277-281, June 3–5, 2008
Paper No: MicroNano2008-70012
Abstract
The unique and desirable behavior of nanocrystalline materials (NCMs) is singularly attributed to the large number of grain boundaries relative to their coarse grain material (CGM) counterparts, which translates into a significant fraction of atoms (up to 50%) located in interfacial regions. Thus, the atomic structure and properties of the grain boundaries are of extreme importance in dictating the macroscopic physical and mechanical properties of NCMs. However, one of the biggest challenges is to produce durable nanostructures that will not lose their properties during service. Hardness, strength, fracture toughness, creep and fatigue experiments have been conducted to assess the properties of nanostructured Cu and their durability under temperature and stress. Molecular dynamics studies have been used to investigate how segregated dopant atoms affect the energetics of grain boundaries and their implications on grain growth in nanocrystalline metals by our group.