529 Generation of Intergranular Strain on Laser Peened Surface

Under cyclic load, the major shortcoming–ratcheting is produced in Wolffersdorff hypoplastic constitutive model. For eliminating ratcheting, Wolffersdorff hypoplastic model is ameliorated based on intergranular strain tensor. The added parameters in ameliorated model are determined by optimization method. Under cyclic load of triaxial consolidation undrained condition, the mechanics features of sand are described by the ameliorated Wolffersdorff hypoplastic constitutive model. Preliminary result shows that with increasing times of cyclic load excess pore water pressure is increased gradually and effective stress is reduced gradually. When effective is reduced to zero, the liquefaction happens. So in many projects, excess pore water pressure must dissipate by means of some measures. The sand liquefaction under the dynamic load is avoided.

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Intergranular-strain elastic model for recent stress history effects on clay

Computers and Geotechnics ◽

10.1016/j.compgeo.2019.103316 ◽

2020 ◽

Vol 118 ◽

pp. 103316 ◽

Cited By ~ 1

Author(s):

Zhenhao Shi ◽

Maosong Huang

Keyword(s):

Elastic Model ◽

Stress History ◽

History Effects ◽

Intergranular Strain

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intergranular strain

Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik ◽

10.1007/978-3-642-41714-6_91357 ◽

2014 ◽

pp. 740-740

Keyword(s):

Intergranular Strain

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Intergranular Strain and Phase Transformation in a Cobalt-Based Superalloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.524-525.893 ◽

2006 ◽

Vol 524-525 ◽

pp. 893-898 ◽

Cited By ~ 3

Author(s):

Michael L. Benson ◽

A.D. Stoica ◽

Peter K. Liaw ◽

Hahn Choo ◽

T.A. Saleh ◽

...

Keyword(s):

Phase Transformation ◽

Strain Analysis ◽

Face Centered Cubic ◽

Macroscopic Stress ◽

Intergranular Strain ◽

Lattice Strains ◽

The Face ◽

Face Centered ◽

Fcc Phase ◽

In Situ Neutron Diffraction

ULTIMET® alloy, a cobalt-based superalloy with good corrosion and wear resistant properties, exhibits a deformation-induced phase transformation from the face-centered-cubic (FCC) phase to the hexagonal-close-packed (HCP) phase. The HCP phase formation during monotonic tensile loading was investigated using in-situ neutron diffraction. The HCP phase is first observed at a stress level of 810 MPa, which is well beyond macroscopic yielding. Strain analysis is performed on the FCC phase diffraction data in order to relate the lattice-strain development with the evolution of the new HCP phase. A method of calculating the effective macroscopic stress associated with the measured lattice strains is presented here. The effective stress can then be compared to the applied macroscopic stress in order to draw conclusions about the load-partitioning behavior of the material as a new phase develops.

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