The Influence of Strain Rate and Strain Ageing on the Flow Stress of Commercially Pure Aluminum PDF Download
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Author: A. Rosen
Publisher:
ISBN:
Category :
Languages : en
Pages : 43
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Book Description
Tensile tests on annealed, commercially pure aluminum specimens were performed in a hard machine at different temperatures for a number of constant strain rates. The results show that a range of strain, strain rate, and temperature exists for which the flow stress decreases with strain rate. This material property, when coupled with suitable mechanical conditions, is believed to be cause of discontinuous, repeated yielding. Various experiments, especially relaxation and reloading tests, show that the decrease of flow stress with strain rate can be directly attributed to rapid strain aging due to impurity diffusion. Other experiments indicate the same effect for different loading histories. An analytical representation of the strain rate and strain aging of the material is developed which predicts results in very good agreement with the experiments.
Author: A. Rosen
Publisher:
ISBN:
Category :
Languages : en
Pages : 43
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Book Description
Tensile tests on annealed, commercially pure aluminum specimens were performed in a hard machine at different temperatures for a number of constant strain rates. The results show that a range of strain, strain rate, and temperature exists for which the flow stress decreases with strain rate. This material property, when coupled with suitable mechanical conditions, is believed to be cause of discontinuous, repeated yielding. Various experiments, especially relaxation and reloading tests, show that the decrease of flow stress with strain rate can be directly attributed to rapid strain aging due to impurity diffusion. Other experiments indicate the same effect for different loading histories. An analytical representation of the strain rate and strain aging of the material is developed which predicts results in very good agreement with the experiments.
Author:
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ISBN:
Category : Science
Languages : en
Pages : 1014
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Author:
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ISBN:
Category :
Languages : en
Pages : 424
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Author: Peter L. Raffo
Publisher:
ISBN:
Category : Deformations (Mechanics)
Languages : en
Pages : 36
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Book Description
A study was made of the influence of dynamic strain aging on the creep and short time tensile properties of a Mo-0.82 Ti-0.20 C (at. %) alloy. The strengthening effects are directly related to carbide precipitation during deformation. The precipitation lowers the density of mobile dislocations and slows down Ihe rate of recovery.
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 760
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Book Description
Author: Ulric S. Lindholm
Publisher: Springer Science & Business Media
ISBN: 3642874452
Category : Science
Languages : en
Pages : 435
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Book Description
An adequate physical and mathematical description of material be havior is basic to all engineering applications. Fortunately, many prob lems may be treated entirely within the framework of elastic material response. While even these problems may become yuite complex be cause of geometrical and loading conditions, the linearity, reversibility, and rate independence generally applicable to elastic material descrip tion certainly eases the task of the analyst. Today, however, we are in creasingly confronted with practical problems which involve material response which is inelastic, hysteretic and rate dependent combined with loading which is transient in nature. These problems include, for instance, structural response to moving or impulsive loads, all the areas of ballistics (internal, external and terminal), contact stresses under high speed bearings, high speed machining, rolling and other metal working processes, explosive and impact forming, shock attenuation structures, seismic wave propagation, and many others of equal im portance. As these problems were encountered, it became increasingly evident that we did not have at hand the physical or mathematical description of the behavior of materials necessary to produce realistic solutions. Thus, during the last ten years particularly, there has been considerable effort expended toward the generation of both experi mental data on the dynamic mechanical response of materials as well as the formulation of realistic constitutive theories. It was the purpose of the Symposium at which the articles in this book were presented to discuss and review recent developments in this field.
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Category : Aeronautics
Languages : en
Pages : 704
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Author:
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ISBN:
Category : Government publications
Languages : en
Pages : 1470
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Author: James F. Bell
Publisher: Springer Science & Business Media
ISBN: 3642884407
Category : Science
Languages : en
Pages : 263
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Book Description
Historically, a major problem for the study of the large deformation of crystalline solids has been the apparent lack of unity in experimentally determined stress-strain functions. The writer's discovery in 1949 of the unexpectedly high velocity of incremental loading waves in pre-stressed large deformation fields emphasized to him the pressing need for the independent, systematic experimental study of the subject, to provide a firm foundation upon which physically plausible theories for the finite deformation of crystalline solids could be constructed. Such a study undertaken by the writer at that time and continued uninterruptedly to the present, led in 1956 to the development of the diffraction grating experiment which permitted, for the first time, the optically accurate determination of the strain-time detail of non-linear finite amplitude wave fronts propagating into crystalline solids whose prior history was precisely known. These experimental diffraction grating studies during the past decade have led to the discovery that the uniaxial stress-strain functions of 27 crystalline solids are unified in a single, generalized stress-strain function which is described, much of it hitherto unpublished, in the present monograph. The detailed study of over 2,000 polycrystal and single crystal uni axial stress experiments in 27 crystalline solids, in terms of the variation of a large number of pertinent parameters, has provided new unified pat terns of understanding which, it is hoped, will be of interest and value to theorists and experimentalists alike.
Author:
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Category : Engineering
Languages : en
Pages : 554
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Book Description
Includes proceedings of various meetings and conferences.
