Observation of Through-Thickness Deformation Bands in an Al 6111 Alloy Deformed in Plane Strain Tension

2013 ◽  
pp. 161-169
Author(s):  
P. S. Lee ◽  
G. Jarvis ◽  
A. D. Rollett ◽  
H. R. Piehler ◽  
B. L. Adams
Keyword(s):  
Plane Strain ◽  
Deformation Bands ◽  
Plane Strain Tension

Numerical Analysis of Plane-Strain Tension Test for Rate-Dependent Solids

1992 ◽  
Vol 59 (3) ◽  
pp. 485-490 ◽  
Author(s):  
P. Tugˇcu
Keyword(s):  
Numerical Analysis ◽  
Strain Rate ◽  
Plane Strain ◽  
Rate Sensitivity ◽  
Tension Test ◽  
Engineering Strain ◽  
Plane Strain Tension ◽  
Rate Dependent ◽  
Strain And Strain Rate ◽  
Strain Rate Hardening

The plane-strain tension test is analyzed numerically for a material with strain and strain-rate hardening characteristics. The effect of the prescribed rate of straining is investigated for an additive logarithmic description of the material strain-rate sensitivity. The dependency to the imposed strain rate so introduced is shown to have a significant effect on several features of the load-elongation curve such as the attainment of the load maximum, the onset of localization, and the overall engineering strain.

scholarly journals Rate-dependent ductile fracture under plane strain tension: experiments and simulations

2018 ◽  
Vol 183 ◽  
pp. 02022
Author(s):  
Vincent Grolleau ◽  
Vincent Lafilé ◽  
Christian C. Roth ◽  
Bertrand Galpin ◽  
Laurent Mahéo ◽  
...  
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
Plane Strain ◽  
Static Loading ◽  
High Strain ◽  
Fracture Initiation ◽  
Surface Strain ◽  
Experimental Program ◽  
Loading Conditions ◽  
Plane Strain Tension

Among all other stress states achievable under plane stress conditions, the lowest ductility is consistently observed for plane strain tension. For static loading conditions, V-bending of small sheet coupons is the most reliable way of characterising the strain to fracture for plane strain tension. Different from conventional notched tension specimens, necking is suppressed during V-bending which results in a remarkably constant stress state all the way until fracture initiation. The present DYMAT talk is concerned with the extension of the V-bending technique from low to high strain rate experiments. A new technique is designed with the help of finite element simulations. It makes use of modified Nakazima specimens that are subjected to V-bending. Irrespective of the loading velocity, plane strain tension conditions are maintained throughout the entire loading history up to fracture initiation. Experiments are performed on specimens extracted from aluminum 2024-T3 and dual phase DP450 steel sheets. The experimental program includes quasi static loading conditions which are achieved on a universal testing machine. In addition, high strain rate experiments are performed using a specially-designed drop tower system. In all experiments, images are acquired with two cameras to determine the surface strain history through stereo Digital Image Correlation (DIC). The experimental observations are discussed in detail and also compared with the numerical simulations to validate the proposed experimental technique

The interaction between dislocation-type cracks III. Infinite periodic sequences of noncoplanar cracks

1966 ◽  
Vol 295 (1443) ◽  
pp. 429-439
Keyword(s):  
Plane Strain ◽  
Singular Integral Equations ◽  
Periodic Sequence ◽  
Periodic Sequences ◽  
Plane Strain Tension ◽  
Dislocation Type ◽  
The Stability ◽  
Different Characteristics ◽  
Strain Model

Earlier papers in this series have discussed the interaction between two coplanar dislocation-type cracks and between coplanar cracks that form an infinite periodic sequence, the stability criteria being determined. This paper examines the stability of an infinite periodic sequence of noncoplanar dislocation-type cracks, particular consideration being given to the determination of the complete fracture criterion. Unlike the situation that exists for coplanar dislocation-type cracks, some aspects of the results are radically different depending on whether the mode of deformation is anti-plane strain, plane strain shear, or plane strain tension, and the different characteristics of the three models are emphasized. With the anti-plane strain model exact solutions can be obtained, but with both plane strain shear and plane strain tension models, the governing singular integral equations can only be solved when the cracks are widely spaced.

The Fully Plastic, Plane-Strain Tension of a Notched Bar

1968 ◽  
Vol 35 (1) ◽  
pp. 111-116 ◽  
Author(s):  
J. E. Neimark
Keyword(s):  
Shear Strain ◽  
Strain Hardening ◽  
Plane Strain ◽  
Plastic Material ◽  
Extremum Principle ◽  
Displacement Distribution ◽  
Plane Strain Tension

Hill’s extremum principle for a strain-hardening plastic material is applied to determine the displacement distribution and the strains at the center and at the roots of rounded V-grooves in a bar in tension. This analysis is used to present the shear strain at fracture as a function of triaxial tension for 7075-T6 aluminum, as compared to the more usual tension and torsion tests.

scholarly journals Local Textures in Deformed and Recrystallized Aluminium Crystal

1993 ◽  
Vol 20 (1-4) ◽  
pp. 141-154 ◽  
Author(s):  
A. Akef ◽  
J. H. Driver
Keyword(s):  
Single Crystals ◽  
Plane Strain ◽  
Crystal Orientation ◽  
Recrystallization Texture ◽  
True Strain ◽  
Plane Strain Compression ◽  
Deformation Bands ◽  
Transition Band ◽  
Complete Recrystallization

The recrystallization mechanisms in deformed aluminium single crystals have been investigated by SEM microdiffraction techniques (ECP and EBSP). Aluminium crystals of (001)(uv0) and (001)[011-] orientations were deformed in plane strain compression to a true strain of ~1 to develop different deformation microstructures. Transition bands separating deformation bands were formed by orientation splitting in the (001)(uv0) crystals, but were not observed in the (001)[011-] crystal.During annealing at 250°C and 400°C, recrystallization nuclei are developed in both the deformed matrix and along transition bands. Matrix nucleation appears to occur by a subgrain coalescence mechanism according to which the new grains are misoriented 15-30° from the average as-deformed material. Transition band nucleation gives an orientation spread 20-30° around the original, undeformed crystal orientation. A well-defined cube recrystallization texture is obtained at 400°C after complete recrystallization of the initial cube crystal.

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