scholarly journals Effect of Adjacent Hole on the Blast-Induced Stress Concentration in Rock Blasting

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Yuezong Yang ◽  
Zhushan Shao ◽  
Junfeng Mi ◽  
Xiaofeng Xiong
Keyword(s):  
Stress Concentration ◽  
Stress Wave ◽  
Surface Effect ◽  
Material Model ◽  
Major Effect ◽  
Hole Diameter ◽  
Rock Blasting ◽  
Induced Stress ◽  
Hole Wall ◽  
Hole Effect

To investigate the effect of an adjacent hole on the blast-induced stress concentration in rock blasting, a rock blasting model with an adjacent hole is explored through theoretical analysis and numerical simulation. The commercial software LS-DYNA is utilized to simulate adjacent hole effect in rock blasting, in which the Johnson–Holmquist concrete material model is used to simulate rock and the high-explosive-burn-explosive and the equation of state of JWL are used to simulate explosive. Influences of the key parameters of adjacent hole effect in rock blasting, pitch of holes, adjacent hole diameter, and uncoupled medium in a blasting hole are extensively explored. According to the simulation results, when the explosion stress wave spreads to the adjacent hole wall, the tangential stress on the adjacent hole wall induced by the explosion stress wave is always greater than the radial stress. Adjacent hole diameter has a major effect on stress concentration, but with the adjacent hole diameter increasing, the stress concentration phenomenon weakens and the free surface effect of the adjacent hole plays a more important role.

Numerical Simulation Research on Single Hole_unilateral Protecting Borehole Wall Blasting

2011 ◽  
Vol 368-373 ◽  
pp. 395-398
Author(s):  
Liang Niu ◽  
Zhi Cheng Zhang ◽  
Xiao Ling Liu ◽  
Jun Lin Tao ◽  
Yong Gang Lu
Keyword(s):  
Numerical Simulation ◽  
Stress Wave ◽  
Blast Hole ◽  
Borehole Wall ◽  
Rock Blasting ◽  
Pressure Relief ◽  
Simulation Research ◽  
Hole Wall ◽  
Material Substance

3-D Numerical simulation on the directional pressure relief partition side of blast hole isolation material though LS-DYNA software. The result shows: the semicircle isolation material can put off the time that the explosion stress wave arrived at the hole-wall and reduce the peak of stress wave. Meanwhile, it proves that the explosion in the material substance is more powerful than that in the air. So it has certain directive significance on rock blasting on the slope.

Transdermal Delivery of Photosensitizer by the Laser-Induced Stress Wave in Combination with Skin Heating

2002 ◽  
Vol 41 (Part 2, No. 7A) ◽  
pp. L814-L816 ◽  
Author(s):  
Makoto Ogura ◽  
Shunichi Sato ◽  
Masahiko Kuroki ◽  
Hitoshi Wakisaka ◽  
Satoko Kawauchi ◽  
...  
Keyword(s):  
Stress Wave ◽  
Transdermal Delivery ◽  
Induced Stress

Propagation characteristics of laser-induced stress wave in deep tissue for gene transfer

2009 ◽  
Vol 255 (24) ◽  
pp. 9898-9901 ◽  
Author(s):  
Takahiro Ando ◽  
Shunichi Sato ◽  
Shinta Takano ◽  
Hiroshi Ashida ◽  
Minoru Obara
Keyword(s):  
Gene Transfer ◽  
Stress Wave ◽  
Propagation Characteristics ◽  
Deep Tissue ◽  
Induced Stress

Effect of Geometric Parameters in the Upsetting and Extruding Riveting Process on the Quality of Riveted Joints

2015 ◽  
Vol 651-653 ◽  
pp. 1439-1444 ◽  
Author(s):  
Wei Jia Li ◽  
Lian Fa Yang
Keyword(s):  
Hole Diameter ◽  
Geometric Parameters ◽  
Hole Wall ◽  
Riveted Joints ◽  
Riveting Process ◽  
Simulation Results

Upsetting and extruding riveting is a new joining method, which is mainly used to join castings. In order to investigate the effect of geometric dimensions of punch and upper sheet hole diameter on the quality of joints, models with different geometric parameters were simulated via ABAQUS. According to the simulation results, the riveting process could be divided into five stages. Besides, diameter difference on rivet tail and interference value on upper sheet hole wall were selected as indicators to evaluate quality of joints. And a group of parameters is obtained for a better quality of joints. Finally, the simulation results were validated through experiments.

Elasto-Viscoplastic Dispersive Waves in Silicon Wafers

2007 ◽  
Author(s):  
Li Liu ◽  
C. Steve Suh
Keyword(s):  
Stress Wave ◽  
High Temperatures ◽  
Nonlinear Function ◽  
Low Frequency ◽  
Propagation Model ◽  
Constitutive Law ◽  
Stress Wave Propagation ◽  
Thickness Variation ◽  
Low Frequencies ◽  
Induced Stress

This paper provides the required knowledge base for establishing Laser Induced Stress Wave Thermometry (LISWT) as a viable alternative to current infrared technologies for temperature measurement up to 1000°C with ±1°C resolution. A stress wave propagation model having a complex, temperature-dependent elasto-viscoplastic constitutive law is developed. Investigated results show that wave group velocity is a nonlinear function of temperature. Nonlinearity becomes more prominent at high temperatures and low frequencies. As such, for LISWT to achieve better thermal resolution at high temperatures, low frequency components of the induced stress wave should be exploited. The results also show that the influence of temperature on attenuation is relatively small. It is not recommended to use attenuation for resolving temperature variation as small as several degrees Celsius. In addition to temperature, geometry also is found to have an impact on wave dispersion and attenuation. The influence of thickness on wave velocity is significant, thus suggesting that for LISWT to achieve high temperature resolution, wafer thickness must be accurately calibrated in order to eliminate all possible errors introduced by thickness variation.

Research on Attenuation of Shock Induced Stress Wave in Multi-Layered Thin Cylindrical Rods

2018 ◽  
Vol 878 ◽  
pp. 35-40
Author(s):  
Fei Peng ◽  
Zhi Guang Yang ◽  
Li Peng Wang
Keyword(s):  
Stress Wave ◽  
Wave Attenuation ◽  
Impact Load ◽  
Layered Media ◽  
One Dimension ◽  
Stress Wave Propagation ◽  
Propagation Theory ◽  
Induced Stress ◽  
The One ◽  
Wave Induced

The attenuation of stress wave induced by impact load in multi-layered thin cylindrical rods has been investigated and analyzed. Firstly, based on stress wave propagation theory, the one dimension solution of the response of stress wave in three-layered media has been given. Secondly, a three-layered thin cylindrical rod has been established through FEM, and the propagation and attenuation of stress wave in it has been analyzed. The analytical and numerical results showed that the stress wave attenuation could be achieved by using multi-layered media.

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