scholarly journals Stress wave induced damage and fracture in impacted glasses

1994 ◽  
Vol 04 (C8) ◽  
pp. C8-741-C8-746 ◽  
Author(s):  
H. Senf ◽  
E. Strassburger ◽  
H. Rothenhäusler
Keyword(s):  
Stress Wave ◽  
Damage And Fracture ◽  
Wave Induced

Comparison of Thermomechanical and Stress Wave Induced Laser Repair Techniques for Stiction-Failed Microcantilevers

2004 ◽  
Author(s):  
Sai B. Koppaka ◽  
Thomas J. Mackin ◽  
Leslie M. Phinney
Keyword(s):  
Stress Wave ◽  
Microelectromechanical Systems ◽  
Stress Waves ◽  
Back Side ◽  
Mems Devices ◽  
Repair Method ◽  
Aspect Ratios ◽  
Major Disadvantage ◽  
Initial Processing ◽  
Wave Induced

Surface micromachined structures with high aspect ratios are often utilized as sensor platforms in microelectromechanical systems (MEMS) devices. These structures generally fail by stiction or adhesion to the underlying substrate during operation, or related initial processing. Such failures represent a major disadvantage in mass production of MEMS devices with highly compliant structures. Fortunately, most stiction failures can be prevented or repaired in a number of ways. Passive approaches implemented during fabrication or release include: (1) utilizing special low adhesion coatings and (2) processing with low surface energy rinse agents. These methods, however, increase both the processing time and cost and are not entirely effective. Active approaches, such as illuminating stiction-failed microstructures with pulsed laser irradiation, have proven to be very effective for stiction repair [1–5]. A more recent and promising method, introduced by Gupta et al. [6], utilized laser-induced stress waves to repair stiction-failed microstructures. This approach represents a logical extension of the laser spallation technique for debonding thin films from substrates [7–9]. The method transmits stress waves into MEMS structures by laser-irradiating the back side of the substrate opposite the stiction-failed structures. This paper presents an experimental study that compares the stress wave repair method with the thermomechanical repair method on identical arrays of stiction-failed cantilevers.

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.

ANALYSIS OF COLLISION BETWEEN DRILLSTRING AND WELL SIDEWALL

2008 ◽  
Vol 22 (31n32) ◽  
pp. 5459-5464 ◽  
Author(s):  
G.H. ZHAO ◽  
Z. LIANG
Keyword(s):  
Stress Wave ◽  
Lateral Displacement ◽  
Borehole Wall ◽  
Frequency Method ◽  
Element Analysis ◽  
Premature Failure ◽  
Middle Cross Section ◽  
Fixed End ◽  
Gas Fields ◽  
Wave Induced

Drillstring is the most important tool in petroleum drilling engineering. Alternating stress has been found to be responsible for the premature failure of drillstring. Propagation of stress wave, induced by collision between tool-joints of drillstring and borehole wall, is studied in this paper. The condition that all the tool-joints of drill pipes (DPs) strike borehole wall at the same time has been considered. Because of symmetry, the middle cross section of the DP is simplified as fixed end, and mechanical model is established as the beam with both ends fixed. Propagation of lateral displacement wave and stress wave in the DP is investigated by means of Eigen-frequency method and the Finite Element Analysis software ANSYS. The theoretic results coincide with those obtained from numerical modeling very well and also explain the drillstring accidents in gas fields.

Stress-wave-induced membrane permeation of red blood cells is facilitated by aquaporins

1997 ◽  
Vol 23 (7) ◽  
pp. 1089-1094 ◽  
Author(s):  
S. Lee ◽  
D.J. McAuliffe ◽  
H. Zhang ◽  
Z. Xu ◽  
J. Taitelbaum ◽  
...  
Keyword(s):  
Red Blood Cells ◽  
Stress Wave ◽  
Blood Cells ◽  
Membrane Permeation ◽  
Induced Membrane ◽  
Wave Induced

scholarly journals Monitoring of transient stress wave induced by ArF excimer laser irradiation during photorefractive keratectomy (PRK)

1997 ◽  
Vol 18 (Supplement) ◽  
pp. 225-228
Author(s):  
Miya Yoshikawa ◽  
Tsunenori Arai ◽  
Makoto Kikuchi ◽  
Hironori Nakano ◽  
Satoko Kawauchi ◽  
...  
Keyword(s):  
Laser Irradiation ◽  
Excimer Laser ◽  
Stress Wave ◽  
Photorefractive Keratectomy ◽  
Transient Stress ◽  
Excimer Laser Irradiation ◽  
Arf Excimer Laser ◽  
Wave Induced
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