scholarly journals Discussion: “The Failure of Structural Metals Subjected to Strain-Cycling Conditions” (Swindeman, R. W., and Douglas, D. A., 1959, ASME J. Basic Eng., 81, pp. 203–208)

1959 ◽  
Vol 81 (2) ◽  
pp. 208-209 ◽  
Author(s):  
L. F. Coffin
Keyword(s):  
Structural Metals ◽  
Strain Cycling

scholarly journals The Failure of Structural Metals Subjected to Strain-Cycling Conditions

1959 ◽  
Vol 81 (2) ◽  
pp. 203-208 ◽  
Author(s):  
R. W. Swindeman ◽  
D. A. Douglas
Keyword(s):  
Grain Size ◽  
Rupture Life ◽  
Thermal Strain ◽  
Coarse Grained ◽  
Fine Grained ◽  
Long Time ◽  
Structural Metals ◽  
Number Of Cycles ◽  
Cycles To Failure ◽  
Strain Cycling

Data showing the isothermal strain-cycling capacity of three metals, Inconel, Hastelloy B, and beryllium are presented. It is noted that at frequencies of 0.5 cycle per min the data satisfied an equation of the form Nαϵp = K, where N is the number of cycles to failure, ϵp is the plastic strain per cycle, and α and K are constants whose values depend on the material and test conditions. Data on Inconel are given to establish the effect of grain size, specimen geometry, temperature, and frequency. It is found that, at temperatures above 1300 F, grain size and frequency exert a pronounced effect on the rupture life. Fine-grained metal survives more cycles before failure than coarse-grained material. Long time cycles shorten the number of cycles to failure when the strain per cycle is low. Thermal-strain-cycling data for Inconel are compared to strain-cycling data at the same mean temperature. Good correlation is found to exist between the two types of tests.

Calculations for Uniaxial Stress and Strain Cycling in Plasticity

1984 ◽  
Vol 51 (3) ◽  
pp. 487-493 ◽  
Author(s):  
P. M. Naghdi ◽  
D. J. Nikkel
Keyword(s):  
Type Theory ◽  
Uniaxial Stress ◽  
Mean Value ◽  
Stress And Strain ◽  
Material Response ◽  
Tension And Compression ◽  
Stress Cycling ◽  
The Mean ◽  
Rate Type ◽  
Strain Cycling

Within the framework of an existing purely mechanical, rate-type theory of plasticity, detailed calculations are presented for certain types of material response during stress and strain cycling in a uniaxial homogeneous deformation. These features pertain specifically to material response in stress cycling between fixed values of stress in tension and compression (not necessarily equal in magnitude) resulting in ratcheting of strain, and a type of saturation hardening caused by strain cycling between any two fixed values of strain when the mean value of stress (in tension and compression) tends to zero.

Investigation of the One-Dimensional Endochronic Constitutive Equation for Metals by the Rivlin Test

1984 ◽  
Vol 106 (3) ◽  
pp. 264-270 ◽  
Author(s):  
Han C. Wu ◽  
C. C. Yang
Keyword(s):  
Constitutive Equation ◽  
Strain Path ◽  
Small Strain ◽  
One Dimensional ◽  
Good For ◽  
The One ◽  
Cyclic Straining ◽  
Strain Cycling ◽  
Theory And Experiment

Two sets of experiments with and without strain cycling have been carried out to test the validity of an equation derived from the improved theory of endochronic plasticity. It has been found that for strain path not involving cyclic straining the agreement between theory and experiment is quite good. In the test with strain cycling, the agreement is not good for small strain amplitudes of cycling but the discrepancy diminishes with the increasing amplitude of the strain cycling.

Effects of Low Temperature on Structural Metals

JOM ◽  
1965 ◽  
Vol 17 (7) ◽  
pp. 735-741
Author(s):  
H. L. Martin ◽  
A. G. Imgram
Keyword(s):  
Low Temperature ◽  
Structural Metals
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