Dynamic stress wave reflections/attenuation: Earthquake simulation in centrifuge soil models

1985 ◽  
Vol 13 (1) ◽  
pp. 109-128 ◽  
Author(s):  
Carlos J. Coe ◽  
Jean H. Prevost ◽  
Robert H. Scanlan
Keyword(s):  
Stress Wave ◽  
Dynamic Stress ◽  
Earthquake Simulation ◽  
Wave Reflections

Griffith-II Type Crack Generation and Chip Formation Simulation in Vibration Turning Based on Prandtl-Reuss Flow Principle

2011 ◽  
Vol 201-203 ◽  
pp. 1699-1703
Author(s):  
Li Zhi Gu ◽  
Qi Hong ◽  
Bin Cheng
Keyword(s):  
Simulation Model ◽  
Stress Wave ◽  
Constitutive Relation ◽  
Chip Formation ◽  
Dynamic Stress ◽  
Shock Load ◽  
Stress And Strain ◽  
Crack Generation ◽  
Pile Up ◽  
Chip Separation

In order to profound the function of stress wave in vibration turning and present the effectiveness of instant change of stress and strain in the workpiece under the shock load,put forward a simulation model of materials obeying Prandtl-Reuss flow principle with non-linear constitutive relation for vibration turning with low frequency.Related techniques have been stressed on criterion of chip separation from the workpiece, friction between the chip and the rake of the tool. Results of simulation for both conventional and vibratory turning show that the dynamic stress intension factor is 1.45 times or more in vibratory turning than that in conventional turning. It is the stress wave that leads to the accumulation and concentration of stress, the dislocation pile-up, facilitating the chip generation and development.

scholarly journals The interaction of two inclined cracks with dynamic stress wave loadings

1992 ◽  
Vol 58 (1) ◽  
pp. 77-91
Author(s):  
Chwan-Huei Tsai ◽  
Chien-Ching Ma
Keyword(s):  
Stress Wave ◽  
Dynamic Stress ◽  
Inclined Cracks

The Micro-Mechanism of Vibration Cutting Stress Wave and the Analysis of Macro-Processing Effect

2009 ◽  
Vol 407-408 ◽  
pp. 632-635
Author(s):  
Jia Yao ◽  
Wei Lu ◽  
Chun Shan Liu
Keyword(s):  
Finite Element Method ◽  
Stress Intensity Factor ◽  
Wave Propagation ◽  
Stress Wave ◽  
Dynamic Stress ◽  
Dynamic Stress Intensity Factor ◽  
Shear Angle ◽  
Stress Waves ◽  
Stress Wave Propagation ◽  
Vibration Cutting

The specification of the vibration cutting loading is a decision factor for the generation of stress wave and the stress wave propagation has a significant impact on its micro-mechanism. Making the stress waves’ generation in the cutting area of vibration cutting for entry point, the analysis of internal inflection wave, inflection fracture and dynamic stress intensity factor has been carried out, the simulation of vibration cutting has also been done by finite element method, the essential of energy concentrated role, shear angle increment and cutting quality improvement has been explained.

scholarly journals Fracture Evaluation and Dynamic Stress Concentration of Granite Specimens Containing Elliptic Cavity under Dynamic Loading

Energies ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 3441 ◽  
Author(s):  
Ming Tao ◽  
Ao Ma ◽  
Kang Peng ◽  
Yiqing Wang ◽  
Kun Du
Keyword(s):  
Stress Concentration ◽  
Dynamic Loading ◽  
Stress Wave ◽  
Dynamic Stress ◽  
Axial Ratio ◽  
Dynamic Stress Concentration ◽  
Fracture Characteristics ◽  
Elliptical Cavity ◽  
Fracturing Process ◽  
Dip Angle

The Split-Hopkinson pressure bar (SHPB) was used to determine the fracture characteristics of a long bar rock specimen with an elliptical cavity under different axial ratios and dip angles. A high speed camera was applied to record the fracturing process of the granite specimen around the cavity. The experimental results showed that the fracture characteristics around the elliptical cavity were closely related to the axial ratio and dip angle. A three-dimensional numerical model was established using LS-DYNA to quantitatively analyze the dynamic stress state around the cavity. The numerical results indicate that the dip angle and axial ratio of the elliptical cavity significantly affected the dynamic stress concentration factor (DSCF), then affected the rock failure. The location of higher DSCF led to a higher possibility of spalling failure. The maximum DSCF remarkably decreased with a decreasing dip angle and increased the axial ratio. In the dynamic loading propagate process, the stress concentration distribution around the cavity formed by a compression stress wave had a certain damaging effect on the destruction of rock around the cavity, and the stress concentration generated by the tensile stress wave was the main factor of the rock fracture, which was most notable in the peak area of the stress concentration.

Dynamic Stress Concentration of a Cylindrical Cavity Buried in an Elastic Half-Plane Subjected to a Standing Goodier-Bishop Stress Wave

2002 ◽  
Author(s):  
C. S. Yeh ◽  
T. J. Teng ◽  
W. I. Liao ◽  
W. S. Shyu
Keyword(s):  
Stress Concentration ◽  
Boundary Conditions ◽  
Stress Wave ◽  
Half Plane ◽  
Cylindrical Cavity ◽  
Dynamic Stress ◽  
Scattering Problem ◽  
Ground Surface ◽  
Radiation Condition ◽  
Dynamic Stress Concentration

In this paper, based on a expansion technique proposed by Yeh et al. (1995), the dynamic stress concentration of a cylindrical cavity buried in an elastic half-plane is studied. The cavity and the half-plane are excited by a harmonic standing Goodier-Bishop stress wave which, as a result of taking the normalized frequency tends to zero, is equivalent to a simple uniform static tension parallel to the ground surface. In the formulation, the scattered waves are represented by series expansion and their associated modal fields of the expansion satisfy the boundary conditions on the ground surface as well as the radiation condition at infinity, thus the scattering problem is reduced to the determination of the expansion coefficients by matching the boundary conditions on the cavity. Some numerical results for the dynamic hoop stresses around the wall of the cavity as well as the dynamic stress concentration factors with various buried depth and excitation frequencies are presented.

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