Upsetting Test for Determining Stress-Strain Curves in the Range of Very High Strains

2009 ◽  
pp. 211-211-18
Author(s):  
K Pöhlandt ◽  
K Roll
Keyword(s):  
Stress Strain ◽  
Upsetting Test ◽  
Very High

Determination of stress-strain characteristics at very high strain rates

1970 ◽  
Vol 10 (9) ◽  
pp. 370-376 ◽  
Author(s):  
C. K. H. Dharan ◽  
F. E. Hauser
Keyword(s):  
High Strain ◽  
Strain Rates ◽  
High Strain Rates ◽  
Stress Strain ◽  
Very High

Stress-Strain Testing of Rubber at High Rates of Elongation

1963 ◽  
Vol 36 (1) ◽  
pp. 28-49
Author(s):  
Mark L. Dannis
Keyword(s):  
Tensile Strength ◽  
Time Scale ◽  
High Speed ◽  
Dynamic Properties ◽  
Stress Strain ◽  
High Frequencies ◽  
Apparent Modulus ◽  
Strain Testing ◽  
Considerable Body ◽  
Very High

Abstract It is well known that the properties of rubbery materials depend upon the speed or rate at which they are tested or used. A considerable body of work has shown that the dynamic properties of rubber change with the time scale of the test and, in particular, at very short times or at very fast rates, the properties approach those of plastics, i.e., high modulus and low elongation. These dynamic properties are measured by oscillation methods, usually at small strains. In contrast to this class of information, where the material is rarely strained to failure, one can also strain rubbers unidirectionally to failure at strain rates that correspond to the high frequencies of dynamic measurements. In linear extension experiments, as the rate of stretching increases tensile strength rises, elongation drops, apparent modulus increases, and relaxation losses may go up or down depending upon the particular rubber and the time scale of the phenomenon that is being investigated. Extrapolating the change in tensile strength with rate of testing suggests that tensile strength as we know it should change drastically when measured at very high rates of speed. That is, since the viscoelastic properties of rubber are time dependent, and also dependent upon the speed at which they are tested, the tensile properties of rubbers measured at room conditions with the ordinary Scott or Instron machines probably do not have the same values as at the speeds and frequencies that might be encountered in such situations as tire wear. Hence, we should like to measure the properties of rubbers at very high rates of speed, presumably comparable to those encountered in tire tread wear, in order to find out how much properties do change as the speed of test is increased. In order to measure stress-strain properties at rates of elongation comparable to those we believe exist in tire tread usage, we had to develop a small high speed tensile machine. The purpose of this paper is to describe that machine and some results obtained with it.

scholarly journals Analysis of automotive fixing plate drawing process

Mechanik ◽  
2018 ◽  
Vol 91 (12) ◽  
pp. 1075-1077
Author(s):  
Jarosław Świtacz ◽  
Jarosław Bartnicki
Keyword(s):  
Effective Stress ◽  
Numerical Results ◽  
Numerical Analyses ◽  
Drawing Process ◽  
Stress Strain ◽  
Good Convergence ◽  
Real Process ◽  
Very High

The paper deals with the drawing process of automotive fixing plates realized in progressive tools. Numerical analyses by means of FEM were done for chosen parts of the process. The distributions of effective stress, strain and load parameters were analyzed for realization of real process in practice. Good convergence between numerical results and final parts ones confirms very high applicability of FEM tools in these kinds of processes calculations.

A New Apparatus to Shear Bulk Materials at Various Rates Under Very High Pressure

1970 ◽  
Vol 92 (1) ◽  
pp. 137-138 ◽  
Author(s):  
A. E. Abey ◽  
H. D. Stromberg
Keyword(s):  
High Pressure ◽  
Plastic Region ◽  
Strain Rates ◽  
Bulk Materials ◽  
Stress Strain ◽  
New Apparatus ◽  
Very High

The apparatus described will shear bulk materials at strain rates from 2 × 10−5/sec to 5 × 10−1/sec while the materials are under nearly hydrostatic pressures. This apparatus gives complete stress-strain curves in the plastic region at pressures from about 10 kbar to approximately 80 kbar. Data on beryllium are given as an example of the type of data available from this apparatus.

Isochronous Stress-Strain Curves for Alloy 617

2019 ◽  
Author(s):  
M. C. Messner ◽  
T.-L. Sham
Keyword(s):  
High Temperature ◽  
Design Methods ◽  
Austenitic Steels ◽  
High Temperature Deformation ◽  
Temperature Deformation ◽  
Stress Strain ◽  
Alloy 617 ◽  
Very High Temperature Reactor ◽  
High Temperature Reactor ◽  
Very High

Abstract Alloy 617 is a high temperature nickel based material that could have significant design advantages when compared to austenitic steels in very high temperature reactor applications. Several high temperature design methods, including Section III, Division 5 of the ASME Boiler & Pressure Vessel Code, require a model for the creep and high temperature plastic deformation of a material, quantified as a set of isochronous stress-strain curves. This paper describes the development of a model for the high temperature deformation of Alloy 617. This model is then used to generate design hot tensile and isochronous stress strain curves suitable for use in Section III, Division 5 and other high temperature design methods.

Isochronous Stress/Strain Curves: Origins, Scope and Applications

2011 ◽  
Author(s):  
Douglas L. Marriott
Keyword(s):  
High Temperature ◽  
Constant Strain Rate ◽  
Strain Curve ◽  
Creep Damage ◽  
Tensile Tests ◽  
Variable Load ◽  
Stress Strain ◽  
Structural Problems ◽  
Very High ◽  
Temperature Applications

The isochronous stress/strain curve is a long established method of representing creep data in a manner which, under certain circumstances, provides a quick and often surprisingly accurate approximate solution to time dependent structural problems. Despite criticisms of the foundations of the method, it has survived over the years because it has either been the only method feasible at the time, or it is capable of providing solutions which are often good enough for practical purposes. This paper plans to trace the evolution of structural analysis based on isochronous curves, examining its boundaries of application and the circumstances under which it might be expected to yield plausible answers. Different types of isochronous curves will be described, together with procedures for constructing them from different forms of material data such as constant strain rate tensile tests. Special attention will be given to the representation of tertiary creep in the form of isochronous curves, and how such curves might be used in carrying out simplified analyses of propagating creep damage in complex components. Recent extensions to the original methodology to include variable load and thermal histories will be examined. Possible applications in the emerging field of very high temperature applications, as are expected to be experienced in Gen IV nuclear plant in the future, will be reviewed, with special attention given to the problem of rate dependent short term properties, which looks to become a serious question in development of design allowables for very high temperature applications.

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