Influence of Circular Hole Diameter on Deformation and Failure of Longmaxi Shale

2022 ◽  
Author(s):  
Guansheng Han ◽  
Qinyuan Liang ◽  
Ruyi Bao ◽  
Yu Zhou
Keyword(s):  
Circular Hole ◽  
Hole Diameter ◽  
Deformation And Failure ◽  
Longmaxi Shale

scholarly journals Analysis of Fine Dust Removal Time Using Circular Hole Electrodes of Various Sizes by Corona Discharge

Energies ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1956
Author(s):  
Do-Hyun Kim ◽  
Min-Soo Kim ◽  
Muhammad Adil Khan ◽  
Hee-Je Kim
Keyword(s):  
Corona Discharge ◽  
Circular Hole ◽  
Laboratory Experiments ◽  
Hole Diameter ◽  
The Other ◽  
Fine Dust ◽  
Removal Time ◽  
Air Purifier ◽  
Clean Air ◽  
Total Volatile Organic Compounds

Corona discharge technology is used widely for air purification in laboratory experiments and industry. On the other hand, corona discharge technology has the disadvantage of requiring large-sized electrodes. Therefore, research is needed to reduce the size of the electrodes. In this study, circular hole aluminum electrodes and an air purifier system were designed to reduce the size of the electrodes. Several sets of power conversions were performed to generate a corona discharge. The system consisted of a half bridge inverter, step-up transformer, and Cockcroft Walton circuit. The range of input and output voltages was 30–70 V and 20–25 kV, respectively. A corona discharge was generated by the output voltage. The system could remove smoke in less time with a combination of 13 kHz and an electrode with a hole diameter of 0.2 cm than with the other combinations. The electrode hole diameter affected the removal time of species such as hydrogen carbon hydrogen oxygen (HCHO, formaldehyde), total volatile organic compounds (TVOC), and fine dust, which was confirmed by laboratory experiments. Mathematical derivation and experiments were carried out to prove the validity of the approach; the Clean Air Delivery Rate (CADR) index was 480 μm/m3.

Effect of Material Anisotropies of Hot-Rolled High-Strength Steel Sheet on Localized Deformation Behavior in Hole Expansion - Part-II Simulation and Evaluation of Anisotropic Yield Function

2016 ◽  
Vol 725 ◽  
pp. 598-603 ◽  
Author(s):  
Kazuo Okamura ◽  
Toshiya Suzuki ◽  
Yuya Ishimaru ◽  
Hiroshi Hamasaki ◽  
Fusahito Yoshida
Keyword(s):  
Circular Hole ◽  
High Strength Steel ◽  
Steel Sheet ◽  
Thickness Distribution ◽  
High Strength ◽  
Yield Function ◽  
Hole Diameter ◽  
Sixth Order ◽  
Hole Expansion ◽  
Yield Functions

In this study, the circular hole expansion process of high-strength steel sheet is numerically simulated using FE analysis with Hill48 quadratic, Gotoh’s fourth order, Yld2000-2d and Yoshida’s sixth order polynomial yield function. The effects of anisotropic yield functions on local reduction of thickness are evaluated. The thickness distribution around the circular hole edge at just before necking depends on the initial hole diameter. When the initial hole diameter is relative large, the simulation results give almost same thickness distribution among different yield functions. While the initial hole is relative small, individual characteristics of yield function becomes clear and the sixth order yield function gives the best prediction.

Plane elasticity solution for a half-space weakened by a circular hole and loaded by a concentrated force

2013 ◽  
Vol 22 (1-2) ◽  
pp. 11-25 ◽  
Author(s):  
Alexei V. Proskura ◽  
Alexander B. Freidin ◽  
Anna L. Kolesnikova ◽  
Nikita F. Morozov ◽  
Alexei E. Romanov
Keyword(s):  
Half Space ◽  
Circular Hole ◽  
Plane Elasticity ◽  
Hole Diameter ◽  
Plane Boundary ◽  
Concentrated Force ◽  
Bipolar Coordinates ◽  
Elasticity Problems ◽  
Plane Elasticity Problem ◽  
Inverse Procedure

AbstractWe present a complete analytical solution for the plane elasticity problem of a concentrated force acting on a half-space weakened by a circular hole. The solution is based on the algorithm proposed by G.B. Jeffery in 1920 for elasticity problems, using bipolar coordinates to characterize the geometry. We found the biharmonic stress function describing stresses and strains in the half-space and the associated biharmonic function that allows determining the displacement field. Both functions are given in the form of Fourier series with quite compact coefficients. Particular attention is paid to the displacements at the plane boundary of the half-space. It is discussed how these displacements can be used in an inverse procedure for the identification of a circular hole diameter and position.

The Effect of a Circular Hole on the Pure Twist of an Infinite Strip

1957 ◽  
Vol 24 (1) ◽  
pp. 115-121
Author(s):  
Osamu Tamate
Keyword(s):  
Perturbation Method ◽  
Circular Hole ◽  
Successive Approximation ◽  
Maximum Stress ◽  
Hole Diameter ◽  
Thin Plates ◽  
Width Ratio ◽  
Infinite Strip ◽  
Plate Material ◽  
Kirchhoff Theory

Abstract In a previous paper by the author (1), a theoretical solution for an infinite strip with a circular hole under plain bending is given by the method of successive approximation. This method demands laborious calculations. However, it seems that the labor can be diminished by employing the method of perturbation. In this paper, the effect of a circular hole in an infinite strip under the state of pure twist is investigated with the help of the perturbation method. The maximum deflections on the rim of the hole and the maximum stress couples in the strip are calculated and plotted versus hole-diameter strip-width ratio and Poisson’s ratio of the plate material. Here the strip is considered subjected to the limitation of the Poisson-Kirchhoff theory of bending of thin plates.

scholarly journals Notch sensitivity of A Ceramic Composite with A Circular Hole

1993 ◽  
Vol 2 (5) ◽  
pp. 096369359300200 ◽  
Author(s):  
W.R. Moschelle ◽  
Wright Laboratory ◽  
S. Mall
Keyword(s):  
Silicon Carbide ◽  
Circular Hole ◽  
Fracture Behavior ◽  
Ceramic Composite ◽  
Hole Diameter ◽  
Tensile Fracture ◽  
Specimen Width ◽  
Carbide Matrix ◽  
Silicon Carbide Matrix ◽  
Notched Strength

Silicon carbide matrix reinforced with silicon carbide fabric with a circular hole was studied for its tensile fracture behavior. Hole diameter to specimen width ratios ranged from 0.1 to 0.4. The effect of the hole, for all sizes, was almost negligible, and the notched strength was found to be nearly equal to the unnotched composite strength.

scholarly journals Anisotropic mechanism and characteristics of deformation and failure of Longmaxi shale

2017 ◽  
Vol 47 (11) ◽  
pp. 114611 ◽  
Author(s):  
Bo HE ◽  
LingZhi XIE ◽  
FengXia LI ◽  
Peng ZHAO ◽  
Yao ZHANG
Keyword(s):  
Deformation And Failure ◽  
Longmaxi Shale

Photoelastic Investigation on Plates with Single Interference-Fit Pins with Load Applied to Plate Only

1956 ◽  
Vol 7 (4) ◽  
pp. 297-314 ◽  
Author(s):  
H. T. Jessop ◽  
C. Snell ◽  
G. S. Holister
Keyword(s):  
Stress Concentration ◽  
Flat Plate ◽  
Circular Hole ◽  
Stress Concentration Factor ◽  
Concentration Factor ◽  
Hole Diameter ◽  
Interference Fit ◽  
Applied Tension ◽  
Photoelastic Investigation ◽  
Hole Boundary

SummaryThe introduction of an interference-fit pin in a circular hole in a flat plate is found to result in a reduction in the stress concentration factor at the hole boundary under tension applied to the plate. The S.C.F. decreases rapidly with increase in the ratio of interference stress to applied tension, and decreases also with increase in the ratio of hole diameter to width of plate. Very little difference in the S.C.F. is found for different ratios of Young's modulus of pin and plate.

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