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Deformation of ice under low stresses
39A stepwise regression, and model building, was performed on the data generated by this project. Auth.
Subjects Peripheral to Geomechanics 851351 Post-processing approach in the finite element method. Part 1: Calculation of displacements, stresses and other higher derivatives of the displacements Babuska, I; Miller, A lnt J Num Meth Engng V20, N6, June 1984, P1085-1109 A method for 'post-processing' a finite element solution to obtain high accuracy approximations for displacements, stresses and stress intensity factors is presented. Error estimates and some numerical examples are shown to illustrate the practical effectiveness of the technique. 851352 Post-processing approach in the finite element method. Part 2: The calculation of stress intensity factors Babuska, I; Miller, A lnt J Num Meth Engng V20, N6, June 1984, Pl111-1129 Post-processing techniques for the calculation of generalized stress intensity factors as well as displacements, and stresses near corner points are presented. Two classes of methods, one involving an 'influence' function and the other related to the energy release principle of fracture mechanics are discussed. An error analysis is produced and two numerical examples are given to illustrate the effectiveness of the technique. S n o w and ice m e c h a n i c s 851353 Deformation of ice under low stresses Sego, D C; Morgenstern, N R Can Geotech J V20, N4, Nov 1983, P587-602 The existence of 2 flow laws for polycrystalline ice is confirmed by experiment. One describes the behaviour before the inflection point of a constant stress test, the other describes the behaviour well into the tertiary portion of the strain-time curve. The inflection point in constant stress experiments and the peak in constant strain rate experiments are shown to occur at about 1~o strain for experiments conducted in the ductile material behaviour range. A Cottrell-Aytekin relationship has been used to fit the strain-time material behaviour up to the inflection point. The flow law valid below i~o strain is shown to be dependent on the grain size ratio of the ice.
Subjects Peripheral to Geomechanics 851351 Post-processing approach in the finite element method. Part 1: Calculation of displacements, stresses and other higher derivatives of the displacements Babuska, I; Miller, A lnt J Num Meth Engng V20, N6, June 1984, P1085-1109 A method for 'post-processing' a finite element solution to obtain high accuracy approximations for displacements, stresses and stress intensity factors is presented. Error estimates and some numerical examples are shown to illustrate the practical effectiveness of the technique. 851352 Post-processing approach in the finite element method. Part 2: The calculation of stress intensity factors Babuska, I; Miller, A lnt J Num Meth Engng V20, N6, June 1984, Pl111-1129 Post-processing techniques for the calculation of generalized stress intensity factors as well as displacements, and stresses near corner points are presented. Two classes of methods, one involving an 'influence' function and the other related to the energy release principle of fracture mechanics are discussed. An error analysis is produced and two numerical examples are given to illustrate the effectiveness of the technique. S n o w and ice m e c h a n i c s 851353 Deformation of ice under low stresses Sego, D C; Morgenstern, N R Can Geotech J V20, N4, Nov 1983, P587-602 The existence of 2 flow laws for polycrystalline ice is confirmed by experiment. One describes the behaviour before the inflection point of a constant stress test, the other describes the behaviour well into the tertiary portion of the strain-time curve. The inflection point in constant stress experiments and the peak in constant strain rate experiments are shown to occur at about 1~o strain for experiments conducted in the ductile material behaviour range. A Cottrell-Aytekin relationship has been used to fit the strain-time material behaviour up to the inflection point. The flow law valid below i~o strain is shown to be dependent on the grain size ratio of the ice.