Numerical prediction of blast-induced stress wave from large-scale underground explosion

2003 ◽  
Vol 28 (1) ◽  
pp. 93-109 ◽  
Author(s):  
Chengqing Wu ◽  
Yong Lu ◽  
Hong Hao
Keyword(s):  
Stress Wave ◽  
Large Scale ◽  
Numerical Prediction ◽  
Underground Explosion ◽  
Induced Stress

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

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.

Influence of Oriented Perforation Design on Refracture Reorientation: Simulation and Experiment

2018 ◽  
Vol 140 (8) ◽  
Author(s):  
Minhui Qi ◽  
Mingzhong Li ◽  
Tiankui Guo ◽  
Chunting Liu ◽  
Song Gao ◽  
...  
Keyword(s):  
Hydraulic Fracturing ◽  
Large Scale ◽  
Simulation Models ◽  
Fracture Initiation ◽  
Simulation Method ◽  
Induced Stress ◽  
Study Results ◽  
Simulation Results ◽  
Fracturing Experiments ◽  
The Impact

The oriented perforating is the essential technique to guide the refracture reorientation, but the influence of the oriented perforation design on the refracture steering radius is still unclear. In this paper, the factors influencing the refracture reorientation were studied by simulation models and experiments. The effects of initial fracture, well production, and perforations on the refracture initiation and propagation were analyzed. Three-dimensional finite element models were conducted to quantify the impact of perforation depth, density, and azimuth on the refracture. The large-scale three-axis hydraulic fracturing experiments guided by oriented perforations were also carried out to verify the fracture initiation position and propagation pattern of the simulation results. The research results showed that perforations change the near-wellbore induced stress distribution, thus changing the steering radius of the refracture. According to the simulation results, the oriented perforation design has a significant influence on the perforation guidance effect and refracture characteristics. Five hydraulic fracturing experiments proved the influence of perforating parameters on fracture initiation and morphology, which have a right consistency between the simulation results. This paper presents a numerical simulation method for evaluating the influence of the refracture reorientation characteristics under the consideration of multiple prerefracturing induced-stress and put forward the oriented perforation field design suggestions according to the study results.

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.

In vitro gene transfer by the application of laser-induced stress wave: effect of cellular heating

2004 ◽  
Author(s):  
Mitsuhiro Terakawa ◽  
Shunichi Sato ◽  
Makoto Ogura ◽  
Kuniaki Nakanishi ◽  
Yoshinori Masaki ◽  
...  
Keyword(s):  
Gene Transfer ◽  
Stress Wave ◽  
Wave Effect ◽  
Induced Stress

UDEC–AUTODYN Hybrid Modeling of a Large-Scale Underground Explosion Test

2014 ◽  
Vol 48 (2) ◽  
pp. 737-747 ◽  
Author(s):  
X. F. Deng ◽  
S. G. Chen ◽  
J. B. Zhu ◽  
Y. X. Zhou ◽  
Z. Y. Zhao ◽  
...  
Keyword(s):  
Large Scale ◽  
Hybrid Modeling ◽  
Underground Explosion ◽  
Explosion Test
Sign in / Sign up

Export Citation Format

Share Document