Laser Material Processing

Steen, W. M.

doi:10.1007/978-1-4471-3752-8

Cited by 432 publications

(285 citation statements)

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“…A model of surface temperature has been used based on the thermal energy interaction of the laser irradiation and workpiece surface. If the constant laser energy flux I 0 is absorbed at the workpiece surface and there is no phase change in the material and the heat flows in one dimension then the equation could be written as follows [2,17],…”

Section: Laser Irradiation Testsmentioning

confidence: 99%

“…The absorption coefficient η laser on a nickel based alloy [2,17] distance f 2 . The surface temperatures of Figure 2 (laser energy of 1.5J influential factors resulting in a values are the laser focal spot size, thermocouple position and laser penetration into these materials.…”

Section: Laser Irradiation Testsmentioning

confidence: 99%

“…The acoustic emission (AE) sensor WD-AL04 5 can be calculated approximately as 19.16% [2,17]. The laser power flux I 0 can be adjusted by the off .…”

Section: Grinding Experimentsmentioning

confidence: 99%

“…The theory and the experimental are the laser focal spot size, thermocouple position and laser penetration into these focal distance to these materials also play an important role. If the temperature of the material rises there will be an are more likely to radiate [17].…”

Section: Grinding Experimentsmentioning

confidence: 99%

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Detection of Grinding Temperatures Using Laser Irradiation and Acoustic Emission Sensing Technique

Mohammed

Folkes

Chen

2012

Materials and Manufacturing Processes

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Dr Xun Chen is a reader in Precision Engineering at the School of Computing and Engineering, University of Huddersfield, UK. He is also a founding member of the International Committee for Abrasive Technology. Dr Chen specialises in advanced manufacturing technology including application of computing science and artificial intelligence to manufacturing process monitoring and control, particularly to high efficiency precision grinding technology. His research work has been supported extensively by the Engineering and Physical Sciences Research Council and by industries. He has published more than 150 research papers widely in top journals in Mechanical Manufacturing Engineering. Dr. Chen delivers a number of lectures that covers mechanical manufacturing engineering and management as well as the application of computers. 2 Detection of grinding temperatures using laser irradiation and acoustic emission sensing technique. This paper presents a new method for the detection of grinding thermal behaviours using a laser irradiation technique. Laser irradiation was initially undertaken in the Lumonics JK704 Nd: YAG laser machine under mimic grinding conditions. Temperature elevation was controlled using laser irradiation by varying the laser energy and laser irradiation time. The signatures of acoustic emission (AE) were recorded as pure thermally induced AE signals. A series of grinding experiments were conducted separately to identify different AE sources during grinding. An artificial neural network (ANN) had been trained to distinguish high and low temperatures using laser thermal AE data. This trained ANN was then used to classify burn and no burn in the grinding zone. The classification accuracy achieved 71% when grinding Inconel718 materials. The novelty of this work is reflected in that the laser irradiation induced thermal AE signals can represent grinding thermal behaviour and can be used for grinding burn detection.

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Section: Laser Irradiation Testsmentioning

confidence: 99%

Section: Laser Irradiation Testsmentioning

confidence: 99%

“…The acoustic emission (AE) sensor WD-AL04 5 can be calculated approximately as 19.16% [2,17]. The laser power flux I 0 can be adjusted by the off .…”

Section: Grinding Experimentsmentioning

confidence: 99%

Section: Grinding Experimentsmentioning

confidence: 99%

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Detection of Grinding Temperatures Using Laser Irradiation and Acoustic Emission Sensing Technique

Mohammed

Folkes

Chen

2012

Materials and Manufacturing Processes

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“…3, the laser power is on the order of few kW, concentrated over a spot of diameter 50-100µm. The resulting intensity of 10 8 W /cm 2 is enough to evaporate the material over a narrow region.…”

Section: Introductionmentioning

confidence: 99%

Simulation of the main physical processes in remote laser penetration with large laser spot size

et al. 2015

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A 3D model is developed to simulate remote laser penetration of a 1mm Aluminum metal sheet with large laser spot size (∼ 3x3cm2), using the ALE3D multi-physics code. The model deals with the laser-induced melting of the plate and the mechanical interaction between the solid and the melted part through plate elastic-plastic response. The effect of plate oscillations and other forces on plate rupture, the droplet formation mechanism and the influence of gravity and high laser power in further breaking the single melt droplet into many more fragments are analyzed. In the limit of low laser power, the numerical results match the available experiments. The numerical approach couples mechanical and thermal diffusion to hydrodynamics melt flow and accounts for temperature dependent material properties, surface tension, gravity and vapor recoil pressure.

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Welding and Cutting

Brandt

Weiler

2000

Ullmann's Encyclopedia of Industrial Chemistry

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Laser Material Processing

Cited by 432 publications

References 0 publications

Detection of Grinding Temperatures Using Laser Irradiation and Acoustic Emission Sensing Technique

Detection of Grinding Temperatures Using Laser Irradiation and Acoustic Emission Sensing Technique

Simulation of the main physical processes in remote laser penetration with large laser spot size

Welding and Cutting

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