Influence of acoustic diffraction on laser-induced stress wave effects in absorbing media

1996 ◽  
Author(s):  
Guenther Paltauf ◽  
Martin Frenz ◽  
Heinz Schmidt-Kloiber
Keyword(s):  
Stress Wave ◽  
Induced Stress ◽  
Wave Effects ◽  
Acoustic Diffraction ◽  
Absorbing Media

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.

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

A Dynamic Shell Theory Coupling Thickness Stress Wave Effects With Gross Structural Response

1973 ◽  
Vol 40 (3) ◽  
pp. 731-735 ◽  
Author(s):  
S. E. Benzley ◽  
J. R. Hutchinson ◽  
S. W. Key
Keyword(s):  
Stress Wave ◽  
Shell Theory ◽  
Cylindrical Shells ◽  
Structural Response ◽  
Early Time ◽  
Stress Wave Propagation ◽  
Late Time ◽  
The Finite Element Method ◽  
Wave Effects ◽  
Circumferential Displacement

A theory for thick cylindrical shells is presented that couples the early time thickness stress wave propagation with higher-order shell theory equations. The formulation completely describes the continuum response in the thickness direction for “early time” considerations while representing the circumferential response with a high-order circumferential displacement assumption. Late time (structural response) equations are developed to continue the analysis after thickness effects are no longer important. The finite-element method is used to obtain solutions of the theory. Calculations are presented which show that thickness stress need not be included for cylindrical shells with h/R ratios less than 0.2.

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