An Optimal Method for Determining Anisotropic Parameters Under Combined Stress Tests

1981 ◽  
Vol 9 (2) ◽  
pp. 127
Author(s):  
KC Lieb ◽  
R Horstman ◽  
KA Peters ◽  
RL Meltzer ◽  
M Bruce Vieth ◽  
...  
Keyword(s):  
Stress Tests ◽  
Combined Stress ◽  
Optimal Method

Combined-Stress Tests on 24S-T Aluminum-Alloy Tubes

1947 ◽  
Vol 14 (2) ◽  
pp. A147-A153
Author(s):  
W. R. Osgood
Keyword(s):  
Aluminum Alloy ◽  
Hoop Stress ◽  
Axial Stress ◽  
Axial Strain ◽  
Maximum Deviation ◽  
Shearing Stress ◽  
Stress Tests ◽  
Combined Stress ◽  
Stress Strain ◽  
Shearing Strain

Abstract Combined-stress tests were made on five 24S-T aluminum-alloy tubes, 1 3/4 in. ID × 0.05 in. thick. The ratios of circumferential (hoop) stress to axial stress were 0, 1/2, 1, 2, and ∞. The tubes were tested to failure and sufficient measurements of circumferential strain and axial strain were taken to plot stress-strain curves almost up to rupture. The results are presented in the form of two sets of stress-strain curves for each ratio of stresses, namely, maximum shearing stress plotted against maximum shearing strain, and octahedral shearing stress plotted against octahedral shearing strain. In each plot the maximum deviation of the curves is about ± 5 per cent. A method of evaluating small octahedral shearing strains from the data is given which does not assume Poisson’s ratio to be 1/2.

Combined Stress Tests in Plasticity

1956 ◽  
Vol 23 (1) ◽  
pp. 43-48
Author(s):  
Aris Phillips ◽  
Lloyd Kaechele
Keyword(s):  
Uniaxial Tension ◽  
Plastic Region ◽  
Uniaxial Stress ◽  
Stress Tests ◽  
Combined Stress ◽  
Principal Stresses ◽  
Thin Walled ◽  
Stress Ratios

Abstract A substantial number of combined stress tests on thin-walled tubes of aluminum 2S-O are reported. In most of the tests the tubes have been subjected to combined tension and torsion with variable stress ratios. In the last six tests each tube has first been subjected to uniaxial tension until sufficiently deep in the plastic region and then this state of uniaxial stress has been rotated while the magnitude of the principal stresses remained constant. The purpose of the tests was to get information as to the validity of the incremental theories of plasticity. The results of these tests favor the incremental theories.

Effect of torsional prestrain on the yield locus of 1100-F aluminium

1971 ◽  
Vol 6 (4) ◽  
pp. 263-272 ◽  
Author(s):  
J F Williams ◽  
N L Svenssoon
Keyword(s):  
Yield Criterion ◽  
Maximum Level ◽  
Significant Degree ◽  
Yield Locus ◽  
Statistical Reasoning ◽  
Pure Aluminium ◽  
Stress Tests ◽  
Combined Stress ◽  
Commercially Pure ◽  
Yield Loci

A series of combined stress tests in torsion-tension space is carried out on thin-walled tubes of 1100-F commercially pure aluminium, prestrained to a maximum level of 10 per cent torsional plastic strain. The results are analysed in terms of a proposed, rationally based, yield criterion constructed on statistical reasoning. It is shown that during prestrain, the yield loci undergo a significant degree of distortion, accompanied by a flattening of part of the locus opposite to the loading point. It is found that the yield locus does not rotate under prestrain and, contrary to the findings for tensile prestrain, little evidence of the development of corners at the loading point is observed. The proposed criterion is shown to provide a good fit to the experimental results.

Yielding and Fracture of Medium-Carbon Steel Under Combined Stress

1945 ◽  
Vol 12 (1) ◽  
pp. A13-A24
Author(s):  
E. A. Davis
Keyword(s):  
Carbon Steel ◽  
Test Specimen ◽  
Medium Carbon Steel ◽  
Taylor Model ◽  
Stress Tests ◽  
Combined Stress ◽  
Medium Carbon ◽  
Navy Department ◽  
Rupture Properties

Abstract Results of combined stress tests on a medium-carbon steel are presented. Particular attention has been paid to the magnitude and the distribution of the stresses and strains at the instant preceding fracture. The effect of the shape of the test specimen and the isotropy of the material upon the rupture properties have also been investigated. This investigation was carried out at the Westinghouse Research Laboratories under a contract with the David Taylor Model Basin, Bureau of Ships, U. S. Navy Department, according to plans worked out by Captain W. P. Roop, U.S.N., of the David Taylor Model Basin, and Dr. A. Nadai of Westinghouse.

Determination of Theoretical Plastic Stress-Strain Relations for Variable Combined Stress Ratios

1952 ◽  
Vol 19 (4) ◽  
pp. 485-488
Author(s):  
L. W. Hu ◽  
Joseph Marin
Keyword(s):  
Graphical Methods ◽  
Stress Tests ◽  
Combined Stress ◽  
Stress Strain ◽  
Simple Tension ◽  
Stress Ratios ◽  
Theoretical Stress ◽  
Stress Invariant ◽  
Plastic Stress

Abstract To distinguish between the various theories of plastic flow defining plastic stress-strain relations under combined stresses, it is necessary to conduct combined stress tests in which the ratio of the stress components does not remain constant during the test. To compare these results with the flow theory of the second stress-invariant type, graphical methods have been used to determine the combined plastic stress-strain relations based upon the simple tension plastic stress-strain relations. This paper presents an analytical procedure for the determination of these theoretical stress-strain relations. For certain stress conditions the graphical methods have the disadvantage of yielding inaccurate results—an objection not present in the proposed method. Furthermore, the proposed analytical method is less time-consuming than the graphical methods.

Algorithms Could Replace Stress Tests

2005 ◽  
Vol 35 (13) ◽  
pp. 18
Author(s):  
SHERRY BOSCHERT
Keyword(s):  
Stress Tests
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