The real behaviour of cohesionless granular materials undergoing deformation. A review of stress-strain relations and a theoretical approach to an experimental technique

1976 ◽  
Vol 41 (6) ◽  
pp. 1740-1749
Author(s):  
V. Šmíd ◽  
J. Novosad
Keyword(s):  
Granular Materials ◽  
Experimental Technique ◽  
Theoretical Approach ◽  
Stress Strain ◽  
The Real

Development of a Methodology for Model Testing of Utor Welded Joints of a Vertical Cylindrical Tank

2021 ◽  
pp. 21-27
Author(s):  
D.A. Neganov ◽  
◽  
A.E. Zorin ◽  
O.I. Kolesnikov ◽  
G.V. Nesterov ◽  
...  
Keyword(s):  
Welded Joints ◽  
Strain State ◽  
Welded Joint ◽  
Design Parameters ◽  
Cylindrical Tank ◽  
Stress Strain ◽  
The Real ◽  
Stress Strain State ◽  
Hydraulic Machines ◽  
Wide Range

The methodology of laboratory modeling of the loading of utor welded joint of the tank is presented. The methodology is based on testing of the special design sample. It allows under uniaxial tension on the typical servo-hydraulic machines to reproduce in the zone of a utor welded joint the combined action of bending and shear forces, similar to that which occurs during the operation of a vertical cylindrical tank. To assess the distribution of the stress-strain state in the proposed design of the sample under its loading, the finite element modeling was performed in the ANSYS software package. It showed the fundamental correspondence of the stress distribution in the zone of the utor node in the sample and in the real tank. The experimental studies consisted in carrying out tests for the durability of a series of 16 samples loaded with the maximum force in the cycle, causing the calculated stresses in the zone of the welded utor node in the range of 100–200 % from the maximum permissible ones. The obtained results showed that the maximum loaded zone, where the destruction of the samples occurred, is the near-seam zone of the utor welded joint on the inside of the tank. This corresponds to the statistics of the real tank failures. It is established that the developed methodology ensures the possibility of carrying out correct resource tests of the tank utor welded joints. It is also possible to vary the stress-strain state scheme within a wide range in the area of the utor welded joint by changing the design parameters of the test sample. In compliance with the regulated welding technologies and the absence of unacceptable defects in the welded joint, the utor node has a high resource, which significantly exceeding 50 years of the tank operation.

Simulation Analysis of the Tensile Process on Sheet Sample

2011 ◽  
Vol 117-119 ◽  
pp. 92-96
Author(s):  
Yin Lan Bai ◽  
Da Yong You ◽  
Guo Qing Lu ◽  
Chen Xin Liu
Keyword(s):  
Simulation Analysis ◽  
Strain Curve ◽  
New Product ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Simulation Data ◽  
The Real ◽  
Finite Element Software ◽  
Tensile Process ◽  
Sheet Sample

Stress-strain is commonly used in engineering; however the real stress-strain is more used in the test and exploitation of new product. ANSYS finite element software is adopted in this study, stress-strain of the tensile sample of the sheet in different stage is calculated under the 10mm displacement load, stress-strain curve is obtained, and the engineering and the real stress-strain are analyzed. The results show that simulation data are in accordance with the measured ones, the error is less than 3%, which proves that the model is the rational.

Stress-strain relationship for granular materials based on the hypothesis of best fit

1997 ◽  
Vol 34 (31-32) ◽  
pp. 4087-4100 ◽  
Author(s):  
Ching-Lung Liao ◽  
Ta-Peng Chang ◽  
Dong-Hwa Young ◽  
Ching S. Chang
Keyword(s):  
Granular Materials ◽  
Stress Strain ◽  
Strain Relationship ◽  
Best Fit

scholarly journals A New Hybrid Viscoelastic Soft Tissue Model based on Meshless Method for Haptic Surgical Simulation

2013 ◽  
Vol 7 (1) ◽  
pp. 116-124 ◽  
Author(s):  
Yidong Bao ◽  
Dongmei Wu ◽  
Zhiyuan Yan ◽  
Zhijiang Du
Keyword(s):  
Soft Tissue ◽  
Stress Relaxation ◽  
Surgical Simulation ◽  
Viscoelastic Model ◽  
Stress Strain ◽  
Tissue Model ◽  
The Real ◽  
Strain Stress ◽  
Formula Derivation ◽  
Stability And Accuracy

This paper proposes a hybrid soft tissue model that consists of a multilayer structure and many spheres for surgical simulation system based on meshless. To improve accuracy of the model, tension is added to the three-parameter viscoelastic structure that connects the two spheres. By using haptic device, the three-parameter viscoelastic model (TPM) produces accurate deformationand also has better stress-strain, stress relaxation and creep properties. Stress relaxation and creep formulas have been obtained by mathematical formula derivation. Comparing with the experimental results of the real pig liver which were reported by Evren et al. and Amy et al., the curve lines of stress-strain, stress relaxation and creep of TPM are close to the experimental data of the real liver. Simulated results show that TPM has better real-time, stability and accuracy.

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