scholarly journals THE DETERMINATION OF TRUE STRESS-TRUE STRAIN CURVES AND MODULUS OF ELASTICITY OF URANIUM-10 w/o MOLYBDENUM ALLOY AT ELEVATED TEMPERATURES. Final Report to Atomic Power Development Associates

1958 ◽  
Author(s):  
B. McPherson
Keyword(s):  
Modulus Of Elasticity ◽  
Elevated Temperatures ◽  
True Strain ◽  
True Stress ◽  
Molybdenum Alloy ◽  
Final Report ◽  
Power Development

Diameter Gage for Use at Elevated Temperatures and Intermediate Tensile Strain Rates

1974 ◽  
Vol 96 (3) ◽  
pp. 195-200
Author(s):  
T. A. Jur
Keyword(s):  
Deformation Behavior ◽  
Tensile Strain ◽  
Elevated Temperatures ◽  
True Strain ◽  
Tensile Specimen ◽  
True Stress ◽  
Strain Rates ◽  
Uniform Deformation ◽  
Strain Data

A diameter gage is described which has been used to obtain true stress-true strain data at elevated temperatures. The device is capable of continuously and automatically measuring diameter of a tensile specimen to a true strain as high as 0.90–0.95. Data are presented which demonstrate the ability of the gage to identify conditions of non-uniform deformation behavior.

Determination of the Work Hardening Exponent by the Hollomon and Differential Crussard-Jaoul Analyses of Cold Drawn Ferrite-Pearlite Steels

2006 ◽  
Vol 509 ◽  
pp. 37-42 ◽  
Author(s):  
I. Mejía ◽  
C. Maldonado ◽  
Josep Antonio Benito ◽  
Jordi Jorba ◽  
Antoni Roca
Keyword(s):  
Work Hardening ◽  
True Strain ◽  
Research Work ◽  
Cold Drawing ◽  
True Stress ◽  
Differential Analysis ◽  
Tension Tests ◽  
Slope Change ◽  
Work Hardening Exponent

This research work analyses the effect of cold working level produced by drawing, on the work hardening exponent of 0.18 and 0.43 % C ferrite-pearlite steels. Such analysis is carried out by means of true stress-true strain curves derived from uniaxial tension tests. The work hardening exponent behaviour was determined by using Hollomon and differential Crussard-Jaoul models. It is found that the work hardening exponent decreases as a function of the applied cold-drawing level, and negative values were obtained when differential analysis is used. The results indicate that the Hollomon analysis shows some deviations from the experimentally determined true stress - true strain curves while the differential Crussard-Jaoul analysis fits better when two work hardening exponents are considered. This analysis establishes two exponents for different stages of plastic deformation which are determined by the sharp slope change in the plot of ln (d σ/d ε) - ln ε.

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