Visualizing the radial and circumferential strain distribution within vessel phantoms using synthetic-aperture ultrasound elastography

2012 ◽  
Vol 59 (8) ◽  
pp. 1639-1653 ◽  
Author(s):  
Sanghamithra Korukonda ◽  
Marvin Doyley
Keyword(s):  
Strain Distribution ◽  
Circumferential Strain ◽  
Ultrasound Elastography ◽  
Synthetic Aperture

Plastic Deformation of Anisotropic Tubes in Hydraulic Bulging

1978 ◽  
Vol 100 (4) ◽  
pp. 421-425 ◽  
Author(s):  
D. M. Woo ◽  
A. C. Lua
Keyword(s):  
Strain Distribution ◽  
Circumferential Strain ◽  
Plastic Anisotropy ◽  
Strain Ratio ◽  
Stress Strain ◽  
Thickness Strain ◽  
Process Comparison ◽  
Tension Tests ◽  
Anisotropy Effect ◽  
Hydraulic Bulging

The anisotropy of tubular material is assessed from the values of the width/thickness strain ratio determined in the tension tests. Applying Hill’s theory of plastic anisotropy, these values are incorporated in the expressions for determining the stress/strain characteristics for anisotropic material in the tension and bulge tests, and also in the theoretical analysis of the hydraulic bulging of anisotropic tubes. Experiments have been carried out on copper tubes. Taking into account the anisotropy effect, the stress/strain curves determined in the tension and bulge tests agree closely except at the low strain region. In the analysis of the bulging process, comparison is made between the theoretical and the experimental circumferential strain distribution. The results appear satisfactory.

scholarly journals Experimental study and FEM analysis of forward hot dieless spinning

2018 ◽  
Vol 19 (4) ◽  
pp. 404
Author(s):  
Mohammad Sedighi ◽  
Iraj Jalili ◽  
Mehdi Kasaeian-Naeini
Keyword(s):  
Experimental Study ◽  
Experimental Work ◽  
Strain Distribution ◽  
Circumferential Strain ◽  
Numerical Study ◽  
Fem Analysis ◽  
Numerical Results ◽  
Explicit Model ◽  
Spinning Process

In this study, the forward hot dieless spinning method is employed in order to fabricate conical tubes using thick aluminum. The process is first examined numerically and then verified by an experimental work. In the numerical study, a 3-D dynamic explicit model is used to solve a common problem in the modeling of the spinning process, the tube is fixed and the roller rotates around the tube. The strain distribution in the tube at various forming passes is studied. The numerical results show that the circumferential strain distribution in different positions of the tube has a negative value whose value increases toward the free end of the tube. Besides, the results indicate that the hardness of the sample increases by about 18% due to the hot dieless spinning process and such a hardness augmentation is obvious along the thickness of the formed tube.

A Study on Circumferential Strain Distribution on the Bearing Plate of a Ground Anchor

2018 ◽  
Vol 38 (6) ◽  
pp. 381-387
Author(s):  
Il-Bum Kwon ◽  
Yong-Seok Kwon ◽  
Dae-Cheol Seo ◽  
Eun-Ho Kim ◽  
Sang-Young Yun
Keyword(s):  
Strain Distribution ◽  
Circumferential Strain ◽  
Bearing Plate ◽  
Ground Anchor

scholarly journals Damage Evolution and Circumferential Strain Distribution Characteristics of the Bolt-Supported Cavern under Multiple Explosion Sources

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Taotao Wang ◽  
Ansheng Cao ◽  
Weiliang Gao ◽  
Guangyong Wang ◽  
Xiaowang Sun
Keyword(s):  
Tensile Stress ◽  
Stress Wave ◽  
Strain Distribution ◽  
Damage Evolution ◽  
Circumferential Strain ◽  
Circumferential Stress ◽  
Surrounding Rock ◽  
Distribution Characteristics ◽  
Finite Element Software ◽  
The Impact

The impact of multiple explosion sources on the safety of the underground cavern is enormous. Based on a similarity model test, the finite element software LS-DYNA3D was utilized to analyze the damage evolution and circumferential strain distribution characteristics of the bolt-supported cavern under the seven combinations of concentrated charge explosion sources in three places, including the side of the vault, side arch, and sidewall. The accuracy of the simulation results is verified by comparing them with test results. The research results indicate that the damage of the surrounding rock is mainly caused by the tensile stress wave reflected from the free surfaces and the superposition of the tensile stress wave. The damage of the surrounding rock in the cases of multiple explosion sources is not a simple superposition of that in the cases of a single explosion source. The peak circumferential stress and damage of the surrounding rock in the middle of two explosion sources are significantly greater than that of the cases of the corresponding single explosion source. In the seven cases, the peak circumferential strain of the cavern wall changes from tensile to compressive from the vault to the spandrel. When the explosion occurs on the sidewall, the peak circumferential strain of the floor is tensile.

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