Experimental investigation of initial yield surfaces of solid foams and their evolution under subsequent loading

2020 ◽  
Vol 791 ◽  
pp. 139762
Author(s):  
M. Felten ◽  
S. Diebels ◽  
A. Jung
Keyword(s):  
Experimental Investigation ◽  
Initial Yield ◽  
Solid Foams ◽  
Yield Surfaces

An experimental investigation of the initial and subsequent yield surfaces of 40Kh steel

1983 ◽  
Vol 15 (11) ◽  
pp. 1590-1595 ◽  
Author(s):  
A. V. Troshchenko ◽  
N. M. Kul'chitskii
Keyword(s):  
Experimental Investigation ◽  
40Kh Steel ◽  
Yield Surfaces

Effect of Cyclic Loading on the Yield Surface

1979 ◽  
Vol 101 (1) ◽  
pp. 59-63 ◽  
Author(s):  
F. Ellyin ◽  
K. W. Neale
Keyword(s):  
Aluminum Alloy ◽  
Steady State ◽  
Cyclic Loading ◽  
Yield Surface ◽  
Stress Ratio ◽  
Axial Stress ◽  
Repeated Loading ◽  
Plastic Response ◽  
Initial Yield ◽  
Yield Surfaces

The effect of repeated loading on the yield surface is investigated experimentally for an aluminum alloy. Initial yield surfaces under combined axial stress and torsion are first obtained, and yield surfaces subsequent to steady-state plastic response are then determined for various cyclic loading programs. The results suggest that the initial yield surface expands and translates under cyclic loading and that the form of the steady-state yield surface is independent of the stress ratio.

Time Dependence in Biaxial Yield of Type 316 Stainless Steel at Room Temperature

1983 ◽  
Vol 105 (4) ◽  
pp. 250-256 ◽  
Author(s):  
J. R. Ellis ◽  
D. N. Robinson ◽  
C. E. Pugh
Keyword(s):  
Stainless Steel ◽  
Room Temperature ◽  
Transient Flow ◽  
Time Dependent ◽  
Time Data ◽  
Yield Behavior ◽  
316 Stainless Steel ◽  
Hardening Behavior ◽  
Initial Yield ◽  
Yield Surfaces

This paper describes two biaxial experiments which investigated time and rate effects in the yield and deformation behavior of type 316 stainless steel at room temperature. The first experiment was aimed at determining the effect of probing rate on small-offset yield behavior. The primary aim of the second experiment was to investigate time-dependent flow after loading beyond initial yield. An additional aim was to investigate the effect of radial (3 σ12 = σ11) and nonradial preloads on the yield and hardening behavior. The first experiment showed that for the limited range investigated, 100 to 500 με/min, the probing rate had little effect on yield behavior. The small differences observed in the size and position of certain yield surfaces were shown to be related to the sequence in which the yield loci were determined. The second experiment showed that yield surfaces suffered considerable distortion from their initial near-circular form after both radial and nonradial preloads beyond initial yield. It also showed that the hardening behavior was predominantly kinematic for both types of preload. The strain-time data obtained after the preloads in this experiment showed characteristics typical of creep curves. A transient flow period was observed with high initial strain rates diminishing one or two orders of magnitude during the 0.5-h hold periods. This means that in detailed mechanical modeling of this material, careful attention should be given to time-dependent effects, even at room temperature.

scholarly journals Overview of an Experimental Program for Development of Yield Surfaces Tracing Method

2021 ◽  
Vol 11 (16) ◽  
pp. 7606
Author(s):  
Jan Štefan ◽  
Slavomír Parma ◽  
René Marek ◽  
Jiří Plešek ◽  
Constantin Ciocanel ◽  
...  
Keyword(s):  
Plastic Strain ◽  
Plastic Flow ◽  
Experimental Technique ◽  
Yield Surface ◽  
Equivalent Plastic Strain ◽  
Experimental Program ◽  
Metallic Materials ◽  
Initial Yield ◽  
Yield Surfaces ◽  
Loading Modes

This paper develops an experimental technique to evaluate the initial yield surfaces of metallic materials, as well as to study their evolution during plastic flow. The experimental tracing of yield surfaces is necessary for deriving and calibrating more robust phenomenological models of directional distortional hardening. Such models can be used to characterize the behavior of structures experiencing complicated and demanding loading modes, such as multiaxial ratcheting. The experimental technique developed in this work uses thin-walled tubular specimens, along with a servo-hydraulic machine, under various modes of tension/compression and torque. Identification of the onset of plastic flow is based on a small proof equivalent plastic strain evaluated from the outputs of a contact biaxial extensometer firmly attached to a specimen surface. This allows for evaluation of both the initial yield surface, as well as theevolved yield surface after a plastic prestrain. Throughout a test, continuous and fully automatized evaluation of elastic moduli and proof plastic strain is assured through algorithms written in C# language. The current technique is shown to provide promising results to effectively capture the yield surfaces of conventional metallic materials.

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