Showing papers on "Deformation (meteorology) published in 1973"
TL;DR: In this article, deformation paths arising from tectonic deformation with progressive volume loss superposed on previously compacted material are computed, and these lead to predicted deformation fields which accord well with much of the data available on natural deformation field.
208 citations
TL;DR: In this paper, the deformation energy curves of relatively heavy deformed nuclei are calculated using the constrained Hartree-Fock technique, and the two-body interaction is the Skyrme force and pairing effects are taken into account.
203 citations
TL;DR: This deformation and fracture of high polymers is well known book in the world, of course many people will try to own it and this is it the book that you can receive directly after purchasing.
Abstract: Why should wait for some days to get or receive the deformation and fracture of high polymers book that you order? Why should you take it if you can get the faster one? You can find the same book that you order right here. This is it the book that you can receive directly after purchasing. This deformation and fracture of high polymers is well known book in the world, of course many people will try to own it. Why don't you become the first? Still confused with the way?
176 citations
TL;DR: In this article, a medium strain-rate machine and a split-Hopkinson-bar apparatus are used in conducting the experiments and the temperature rise developed during deformation is also measured by using a thermocouple.
Abstract: Polymethylmethacrylate, cellulose acetate butyrate, polypropylene and nylon 6–6 have been characterized in compression at various strain rates from 10−4 s−1 to 103 s−1 at room temperature. A medium strain-rate machine and a split-Hopkinson-bar apparatus are used in conducting the experiments. The temperature rise developed during deformation is also measured by using a thermocouple. All four materials tested definitely show a viscous effect at the beginning of the deformation and a plastic flow follows thereafter. Test results also indicate that the temperature rise developed during deformation cannot be neglected in determining the dynamic response of those materials investigated in this study.
159 citations
TL;DR: In this article, the authors dealt with the electro-filtrational fields formed near the drainage structures and the main laws of deformation of these fields above vertical and horizontal drains.
Abstract: The paper deals with the electro-filtrational fields formed near the drainage structures Main laws of deformation of these fields above vertical and horizontal drains are considered and practical examples supplied
109 citations
TL;DR: In this article, the modes of deformation of composite materials with a hard core during hydrostatic extrusion are examined, and a theoretical analysis is developed to predict the mode of deformations by using the upper bound method, considering the effects of the end of the billet, yield stress ratio, fraction of the harder core, extrusion ratio, die angle and frictional shear factors at the interface and die surface.
91 citations
TL;DR: For example, pyrrhotite from Sudbury, Ontario, sphalerite from Central Tennessee-Knox District, application to genetic interpretation of ore bodies.
Abstract: Changes in relative strengths, pyrrhotite from Sudbury, Ontario, sphalerite from Central Tennessee-Knox District, application to genetic interpretation of ore bodies
81 citations
80 citations
TL;DR: In this paper, the deformation of spherical bilayer vesicles by magnetic fields is studied and a tentative estimate of the strength of the effect is made. But the results are limited.
72 citations
TL;DR: In this paper, the authors obtained the pressure and deformation profiles between two colliding cylinders by solving the coupled, time-dependent elastohydrodynamic equations with an iterative procedure.
Abstract: The pressure and deformation profiles between two colliding lubricated cylinders are obtained by solving the coupled, time-dependent elastohydrodynamic equations with an iterative procedure. The analysis includes several effects which were not considered in a previous solution by Christensen [4], namely, the effect of surface velocities due to local deformation, the effect of the lubricant compressibility, and the effect of a lubricant with composite pressure-viscosity coefficients. It is found that the local approach velocity plays an important role during final stages of normal approach. It causes the lubricant to be entrapped within the contact region, and both the pressure and deformation profiles appear to converge to the Hertzian profile. The use of a smaller pressure-viscosity coefficient at high pressures reduces the sharp pressure gradient at the center of the contact, and produces a much milder variation of load with respect to the film thickness. The effect of compressibility of the lubricant is found to be relatively small.
TL;DR: In this article, a review of the three major aspects of metal machining: the physical characteristics of chip formation, the properties and operating conditions of cutting tools, and the condition of the final product.
Abstract: This review considers the three major aspects of metal machining: the physical characteristics of chip formation, the properties and operating conditions of cutting tools, and the condition of the final product. There is a brief account of specialized metal-removal techniques and numerical and computer control of modern lathes and milling machines. The contributions of applied physics to metal cutting are emphasized throughout. The dependence of chip formation on the deformation and fracture behaviour of the workpiece and the friction conditions between chip and tool are described. Because of these extreme conditions the choice of tool materials is very restricted.
TL;DR: In this paper, a detailed study of the deformation modes which operate in polyethylene single crystals when drawn on a Mylar substrate was made, and the orientation relationships associated with the stress-induced twinning and monoclinic phase transformations were determined by electron diffraction and compared with predictions based on recently developed theories of the crystallography of martensitic transformations.
Abstract: A detailed study has been made of the deformation modes which operate in polyethylene single crystals when drawn on a Mylar substrate. The orientation relationships associated with the stress-induced twinning and monoclinic phase transformations have been determined by electron diffraction and compared with predictions based on recently developed theories of the crystallography of martensitic transformations. The agreement between theory and experiment is good and the identification of the deformation modes has enabled the criteria which govern the operation of these modes to be established. These criteria and the crystallography of the transformation processes are discussed in detail.
TL;DR: In this paper, thin metal targets were irradiated with a Q-switched neodymium laser and the histories of the deformations were measured using quartz and single-slit diffraction gauges and two distinct deformation modes were discovered.
Abstract: Thin metal targets were irradiated with a Q‐switched neodymium laser. The absorption of the laser energy produced a high‐temperature and ‐pressure plasma which drove stress waves into the targets. In some cases the plasma was confined using the technique developed by Anderholm and it was found that the magnitude of the stress increased with confinement. The histories of the deformations were measured using quartz and single‐slit diffraction gauges and two distinct deformation modes were discovered. The first occurred on a time consistent with the acoustic transit time through the target and the second occurred in terms of transit times, up to an order of magnitude later. This latter late‐time deformation mode resulted in the permanent deformation of the targets.
TL;DR: The deformation and fracture properties of synthetic α-quartz crystals were measured using hardness, pre-cracked bend and Hertzian tests over the range 20 to 545° C in air and dry nitrogen as discussed by the authors.
Abstract: The deformation and fracture properties of synthetic α-quartz crystals were measured using hardness, pre-cracked bend and Hertzian tests over the range 20 to 545° C in air and dry nitrogen. The resistance to fracture decreases significantly with increase in temperature and is orientation-dependent (becoming very small as the inversion temperature is approached), while the microhardness remains relatively insensitive to temperature and environment. These effects are interpreted in terms of the moisture content of the environment and the intrinsic water content of the crystals.
TL;DR: In this paper, the tensile and torsional moduli of polypropylene cylinders were measured as a function of the amount of deformation, and the results showed that the changes in modulus at low deformation ratio were not inconsistent with the model, there is definite evidence that it is not applicable to highly deformed samples.
Abstract: Melt-extruded cylinders of polypropylene can be hydrostatically extruded in the solid-phase to give uniform, highly-oriented rods. The tensile and torsional moduli of such extrudate have been measured as a function of the amount of deformation. Values obtained after large deformations are greater than those previously observed for drawn fibres. Birefringence and X-ray diffraction measurements of orientation have been compared and used to assess uniformity, and to predict the moduli on the basis of a simple aggregate model. Although the changes in modulus at low deformation ratio were not inconsistent with the model, there is definite evidence that it is not applicable to highly-deformed samples.
20 Aug 1973
TL;DR: In this article, the deformation of linear polymers polymers was investigated from three viewpoints: the microscopic, involved measurements of free volume and the relationship of the intermolecular forces to the yield point, the phenomenological, involved the prediction of non-linear viscoelastic programs of deformation in terms of the creep curves, and environmental crazing at low temperatures, involving the effects of gases on the tensile deformation.
Abstract: : The deformation of linear polymers polymers was investigated from three viewpoints (1) the microscopic, involved measurements of free volume and the relationship of the intermolecular forces to the yield point, (2) the phenomenological, involved the prediction of non-linear viscoelastic programs of deformation in terms of the creep curves, and (3) environmental crazing at low temperatures, involved the effects of gases on the tensile deformation. Experiments and theories concerning these three viewpoints are presented.
TL;DR: In this article, a study on the mechanical properties of rubbery polymers under finite deformation is presented using the biaxial stress relaxation method for the experimental study, and the results show that these polymers are robust to deformation.
Abstract: A study on the mechanical properties of rubbery polymers under finite deformation is presented here using the biaxial stress relaxation method for the experimental study. In the first part...
01 Feb 1973
TL;DR: In this paper, an investigation of serrated flow in 6061 aluminum alloy at room temperature has been made using photoelastic coatings with emphasis on two basic types of serrations.
Abstract: An investigation of serrated flow in 6061 aluminum alloy at room temperature has been made using photoelastic coatings with emphasis on two basic types of serrations. This has shown that Type A serrations are associated with Luders bands that travel (in an ideal case) the length of the gage section under an increasing load. Secondary serrations in this type of deformation are due to disturbances in the propagation of the Luders front. The rising load during propagation of the Type A Luders bands is associated with a change in the gage section strain gradient that occurs at the end of “homogeneous” deformation. Type B serrations involve bands that move only during the load drop. The effect of machine stiffness on the deformation accomplished by Type B bands is also considered.
Patent•
04 Nov 1973
TL;DR: A portable load indicating assembly usable to weigh a vehicle by gauging the weight supported by each ground wheel is described in this paper, where a resiliently deformable member positioned between a support base and a load platen is calibrated to indicate the weight on said platen.
Abstract: A portable load indicating assembly usable to weigh a vehicle by gauging the weight supported by each ground wheel, the load indicating assembly having a resiliently deformable member positioned between a support base and a load platen and indicating means sensitive to the deformation of said resiliently deformable member caused by a load on said platen, the indicating means being calibrated to indicate the weight on said platen.