An Experimental Study of Inhomogeneous Cyclic Plastic Deformation

2001 ◽  
Vol 123 (3) ◽  
pp. 274-280 ◽  
Author(s):  
Yanyao Jiang
Keyword(s):  
Plastic Deformation ◽  
Cyclic Loading ◽  
Small Strain ◽  
Local Deformation ◽  
Gage Section ◽  
Strain Gages ◽  
Cyclic Plastic ◽  
Symmetrical Loading ◽  
Increasing Cyclic Loading ◽  
Cyclic Plastic Deformation

A localized inhomogeneous cyclic plastic deformation phenomenon was experimentally investigated in a mild steel. Small strain gages were utilized to characterize the local deformation within the gage section and the gross deformation was measured with an extensometer. Both fully reversed symmetrical loading and asymmetrical loading with a mean stress were used in the cyclic experiments. Plastic deformation was initiated in local areas of the specimen and it propagated into the whole gage section in the specimen with increasing cyclic loading. The local inhomogeneous cyclic deformation was dependent on the loading magnitude and evolved with continued cyclic loading.

A Study of Inhomogeneous Plastic Deformation of 1045 Steel

2004 ◽  
Vol 126 (2) ◽  
pp. 164-171 ◽  
Author(s):  
Jixi Zhang ◽  
Yanyao Jiang
Keyword(s):  
Plastic Deformation ◽  
Cyclic Loading ◽  
Local Deformation ◽  
Cyclic Plasticity ◽  
Lower Yield Stress ◽  
Incubation Stage ◽  
Cyclic Plastic ◽  
Saturation Stage ◽  
Cyclic Plastic Deformation ◽  
1045 Steel

An experimental study was conducted on the inhomogeneous plastic deformation of 1045 steel subjected to monotonic tension and cyclic tension-compression. Small strain gages were used to characterize the local deformation and transmission electron microscopy (TEM) was used to study the microstructures associated with the observed deformation phenomenon. Under monotonic tension, the strain of the Lu¨ders front was lower than the full Lu¨ders strain. The local strains were inhomogeneous even at the work-hardening stage. Under stress-controlled cyclic loading with stress amplitudes below the lower yield stress, cyclic deformation consisted of an incubation stage, a significantly inhomogeneous cyclic softening stage, and a saturation stage. Inhomogeneous cyclic plasticity persisted at the saturation stage. A monotonic tension preload can eliminate the incubation stage in the subsequent cyclic loading. Under asymmetric cyclic loading with a mean stress, the cyclic plastic deformation was accompanied by noticeable inhomogeneous ratcheting deformation. TEM was used to analyze the distribution and evolution of the dislocation structures at different locations of the specimen. With increasing loading cycles, the dislocation substructures evolved in a sequence of loose tangles, thick veins, long walls, elongated cells, and equiaxial cells. Based upon the mechanical experiments and observations of dislocation arrangements, the mechanisms governing inhomogeneous cyclic plastic deformation were discussed.

The mutual effect of hydrogen and cyclic plastic deformation on ductility degradation of X65 reeled-pipeline welded joint

2020 ◽  
Vol 791 ◽  
pp. 139739
Author(s):  
Yuanbo Jiang ◽  
Chengning Li ◽  
Dongpo Wang ◽  
Jiangcheng Liu ◽  
Yezheng Li ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Welded Joint ◽  
Mutual Effect ◽  
Cyclic Plastic ◽  
Cyclic Plastic Deformation
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