Results 21 to 30 of about 194,053 (216)
Measurement of laser absorptivity for operating parameters characteristic of laser drilling regime [PDF]
, 2008 Publisher version : http://iopscience.iop.org/0022-3727/41/15/155502/Laser drilling in the percussion regime is commonly used in the aircraft industry to drill sub-millimetre holes in metallic targets.
SCHNEIDER, Matthieu +3 more
core +1 more source
Investigation of delamination mechanisms during a laser drilling on a cobalt-base superalloy [PDF]
, 2013 Temperatures in the high pressure chamber of aircraft engines are continuously increasing to improve the engine efficiency. As a result, constitutive materials such as cobalt and nickel-base superalloys need to be thermally protected.
SCHNEIDER, Matthieu +8 more
core +1 more source
Induced drilling strains in glass fibre reinforced epoxy composites [PDF]
, 2013 Residual strains induced by drilling of glass-fibre reinforced polymers (GFRP) were determined using a hybrid experimental-numerical methodology. Experimentally, a set of GFRP specimens were drilled under well-defined tensile (calibration) stresses ...
STIFFEL, J.-H. +16 more
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Tool wear monitoring and hole surface quality during CFRP drilling [PDF]
, 2014 The present investigation focuses on the evaluation of tool wear and surface integrity in the context of CFRP cutting. Series of drilling experiments were performed on CFRP plates using cemented carbide solid drills with the aim to investigate ...
RAMIREZ, Christophe +3 more
core +1 more source
Известия высших учебных заведений: Геология и разведка, 2019 Rotary percussion drilling with pneumatic hammers is a promising, high-performance method widely used in the practice of geological exploration, the performance of which is determined mainly by pressure and the amount of cleaning agent supplied by the ...
V. V. Neskoromnykh +2 more
doaj +1 more source
International Journal of Extreme Manufacturing, 2022 We report novel results on top-down percussion drilling in different glasses with femtosecond laser GHz-bursts. Thanks to this particular regime of light – matter interaction, combining non-linear absorption and thermal cumulative effects, we obtained ...
Pierre Balage +4 more
doaj +1 more source
A New Mechanical Specific Energy Model for Composite Impact Drilling
Applied Sciences, 2022 Composite impact drilling technology is one of the important techniques to increase drilling speeds in deep hard formations. In order to evaluate the efficiency of drilling with a composite impactor in real time and effectively, and to further improve ...
Jianyu Qin +6 more
doaj +1 more source
Evaluation of the performance of coated and uncoated carbide tools in drilling thick CFRP/aluminium alloy stacks [PDF]
, 2013 This paper aims to establish the wear mechanisms of coated and uncoated tungsten carbide drills when drilling carbon fibre reinforced plastics (CFRP)/aluminium alloy (Al) stacks. During the drilling experiments, thrust forces were measured.
MONTOYA, Maxime +3 more
core +1 more source
Advances in Femtosecond Laser GHz-Burst Drilling of Glasses: Influence of Burst Shape and Duration
Micromachines, 2023 The femtosecond GHz-burst mode laser processing has attracted much attention in the last few years. Very recently, the first percussion drilling results obtained in glasses using this new regime were reported. In this study, we present our latest results
Pierre Balage +8 more
doaj +1 more source
Design and Numerical Simulation of Bidirectional Coupling Percussion Drilling Tool
Shiyou jixie, 2022 In order to improve the rock-breaking efficiency in hard formations and meet the needs of deep and ultra-deep well drilling, the bidirectional coupling percussion drilling technique was proposed on the basis of torsional impact rock breaking and ...
Zha Chunqing +5 more
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