A Note on the Determination of an Upper Bound on Displacement Rates for Steady Creep Problems

1966 ◽  
Vol 33 (1) ◽  
pp. 216-217 ◽  
Author(s):  
J. B. Martin
Keyword(s):  
Strain Rate ◽  
Upper Bound ◽  
Displacement Rate ◽  
Steady Creep ◽  
Nonlinear Case ◽  
Stress Strain

A method is described whereby the displacement rate at any point on the surface of a body undergoing steady creep may be bounded from above. The method is restricted to n-power stress-strain rate relations, and is of most significance in the nonlinear case.

On the Determination of Stress, Strain, Strain-Rate Relations From Dynamic Beam Tests

1969 ◽  
Vol 36 (3) ◽  
pp. 632-634 ◽  
Author(s):  
P. P. Gillis ◽  
J. M. Kelly
Keyword(s):  
Strain Rate ◽  
Dynamic Testing ◽  
Direct Method ◽  
Bending Moment ◽  
Experimental Results ◽  
Stress Strain ◽  
Analytical Technique ◽  
Flexural Response ◽  
Flexural Tests

A direct method is proposed for the determination of stress, strain, strain-rate relations from dynamic flexural tests in which bending moment is given in terms of curvature and curvature rate, or any other suitable deformation parameter and deformation rate parameter. The method is demonstrated by application to published experimental results. It is found that the stress, strain, strain-rate relations that are derived from the flexural test data are in significantly better accord with uniaxial data on the same material, than moment, curvature, curvature-rate relations predicted from the uniaxial data correspond with the experimental results. It appears that the process of reducing flexural data to uniaxial relations by the method proposed is much less sensitive than that of predicting flexural response from uniaxial data. Since flexural tests have many experimental advantages over uniaxial tests this analytical technique seems to open up possibilities for improved dynamic testing methods.

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