TM Laboratory for Laser Materials Synthesis & Fabrication Department of Materials Science & Engineering Ab-initio Computational Approach to Ab-initio Computational Approach to Laser Micro-machining of Laser Micro-machining of Structural Ceramics Structural Ceramics Anoop N. Samant, Anoop N. Samant, Narendra B. Dahotre Narendra B. Dahotre Laboratory for Laser Materials Laboratory for Laser Materials Synthesis & Fabrication Synthesis & Fabrication Department of Materials Science & Department of Materials Science & Engineering, Engineering, University of Tennessee, University of Tennessee, Knoxville, TN Knoxville, TN
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Laboratory for Laser Materials Synthesis & Fabrication Department of Materials Science & Engineering UNIVERSITY OF TENNESSEE, Knoxville, TN Ab-initio Computational.
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T M
Laboratory for Laser Materials Synthesis & FabricationDepartment of Materials Science & Engineering
UNIVERSITY OF TENNESSEE, Knoxville, TN
Ab-initio Computational Approach to Ab-initio Computational Approach to Laser Micro-machining of Laser Micro-machining of
Structural CeramicsStructural Ceramics
Anoop N. Samant, Anoop N. Samant,
Narendra B. DahotreNarendra B. Dahotre
Laboratory for Laser Materials Synthesis & Laboratory for Laser Materials Synthesis & FabricationFabrication
Department of Materials Science & Engineering,Department of Materials Science & Engineering,University of Tennessee,University of Tennessee,
Knoxville, TNKnoxville, TN
T M
Laboratory for Laser Materials Synthesis & FabricationDepartment of Materials Science & Engineering
UNIVERSITY OF TENNESSEE, Knoxville, TN
OUTLINEOUTLINE
Objectives
Structural Ceramics
Methodology
Laser Machining of Structural Ceramics
Physical Phenomena in Machining
Data Analysis
Contribution of current work
Significance of research
Future Work
Conclusions
T M
Laboratory for Laser Materials Synthesis & FabricationDepartment of Materials Science & Engineering
UNIVERSITY OF TENNESSEE, Knoxville, TN
OBJECTIVESOBJECTIVES
Demonstrate feasibility of laser machining of
structural ceramics.
Understand material removal mechanisms (MRM)
Develop an ab-initio computational model based on
MRM.
Use model for advance predictions of laser processing
conditions to attain desired attributes.
Save considerable energy and time.
T M
Laboratory for Laser Materials Synthesis & FabricationDepartment of Materials Science & Engineering
UNIVERSITY OF TENNESSEE, Knoxville, TN
Properties Low thermal and electrical conductivity High hardness Chemical stability High thermal resistance
Laboratory for Laser Materials Synthesis & FabricationDepartment of Materials Science & Engineering
UNIVERSITY OF TENNESSEE, Knoxville, TN
SIGNIFICANCE OF RESEARCH SIGNIFICANCE OF RESEARCH
Proposed systematic approach is an advancement of
existing computational approach to ceramic machining.
Advance prediction of number of pulses/ pulse duration/
pulse energy possible.
Developed model can be extended to two and three
dimensional laser machining.
A system with optimum machining rate can be
generated.
T M
Laboratory for Laser Materials Synthesis & FabricationDepartment of Materials Science & Engineering
UNIVERSITY OF TENNESSEE, Knoxville, TN
FUTURE WORKFUTURE WORK
Laser Machining in 2 D (Laser Cutting) and 3D
(engraving complex shapes).
Effect of multiple passes on machined depth by
considering preheating effect.
In-situ temperature measurements and
absorptivity predictions using thermocouples.
T M
Laboratory for Laser Materials Synthesis & FabricationDepartment of Materials Science & Engineering
UNIVERSITY OF TENNESSEE, Knoxville, TN
SUMMARYSUMMARY Structural ceramics were successfully machined.
Theoretical model incorporating several vital effects encountered during machining was developed.
Model predictions compared well with experimental observations for machining.
Model aids to provide an advance estimate of number of pulses required for machining required depth or the depth machined after applying certain number of pulses.
Laser Fluence and machining time could also be predicted.
T M
Laboratory for Laser Materials Synthesis & FabricationDepartment of Materials Science & Engineering