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

scholarly journals Dynamic Stress Intensity Factor for Subsurface Inclined Cracks

1994 ◽  
Vol 120 (3) ◽  
pp. 483-498 ◽  
Author(s):  
Chien‐Ching Ma ◽  
Szu‐Kuzi Chen
Keyword(s):  
Stress Intensity Factor ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Dynamic Stress ◽  
Dynamic Stress Intensity Factor ◽  
Inclined Cracks

Fundamental Study of Dynamic Stress Wave Using a Dynamic Photoelastic Method

2000 ◽  
Vol 183-187 ◽  
pp. 337-342
Author(s):  
Tsuyoshi Kanemitsu ◽  
Yoshiaki Sawa
Keyword(s):  
Stress Wave ◽  
Dynamic Stress ◽  
Photoelastic Method ◽  
Fundamental Study

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.

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.

scholarly journals Penetration Form of Inter-Hole Cracks under Double-Hole Blasting Conditions with Inclined Fissures

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Shiwei Shen ◽  
Yue Zhao ◽  
Chang Liu ◽  
Shulin Dai ◽  
Fei Wu ◽  
...  
Keyword(s):  
Stress Wave ◽  
Blast Hole ◽  
Vertical Direction ◽  
Propagation Mode ◽  
Expansion Velocity ◽  
Propagation Law ◽  
Tunnel Blasting ◽  
Dynamic Caustics ◽  
Inclined Cracks ◽  
Peak Value

During blasting construction in tunnel engineering, an inclined fissure near the blast hole produces the “Z” type of over-excavation and subsequently affects the overall blasting effect and stability of the tunnel. In this work, dynamic caustics testing was used to study the burst propagation mode and penetration form of explosive cracks at different positions between holes under double-hole blasting conditions. Results showed that the existence of gently inclined cracks changed the propagation law of explosive stress wave. The dominant fracture surface was formed in the vertical direction between the borehole and the fracture. Finally, the crack penetrates to form “Z”-type over-excavation, which was analyzed by the dynamic caustics test. The expansion velocity of the burst crack reached the maximum under the reflection of the explosion stress wave and then decreased with the attenuation of the stress wave intensity. The peak propagation velocity decreased with the increasing vertical distance between the prefabricated fracture and the borehole, and the stress intensity factor at the crack tip immediately reached its peak value after detonation, and the oscillation then decreased. These research results can serve a basis for reducing tunnel blasting over-excavation under this condition and optimizing blasting parameters.

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