The effect of temporal pulse shape on drilling efficiency

Cho Lik Chan, David W. Campbell, Andrew E. Paul

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A previously developed 1-D transient laser uniting model with variable properties is used to investigate effect of temporal pulse shape on drilling efficiency during laser uniting. The model contains three different physical domains, solid, liquid and vapor. The material properties such as absorptivity, thermal conductivity, and heat capacity can be functions of temperature. The governing equations in each domain are solved numerically using the boundary irnmobilization transformation. The final solution is obtained by an iterative scheme to satisfy the energy balance along the solid-liquid and liquid-vapor interfaces. An Energy balance is implemented by calculating the energy reflected, Er, the energy loss due to convection and radiation at the boundaries, Eloss the energy storage, Eg, energy removal by vaporization, Ev, and energy removal by liquid expulsion, E l at each time step. These energies sum up to the total incident energy from the laser with less than 0.1% error. Using this drilling model, we perform a study of the effect of different pulse shape on drilling efficiency as defined by mass removal per unit laser energy per pulse. Simulations are done using mild steel properties. Results for top hat and ramp temporal laser pulse shapes are presented and discussed. Energy partition and threshold are calculated. It was found that the ramp temporal laser pulse shape is more efficient in material removal.

Original languageEnglish (US)
Title of host publicationICALEO 2002 - 21st International Congress on Applications of Laser and Electro-Optics, Congress Proceedings
PublisherLaser Institute of America
ISBN (Print)0912035722, 9780912035727
DOIs
StatePublished - 2002
EventICALEO 2002 - 21st International Congress on Applications of Laser and Electro-Optics - Scottsdale, AZ, United States
Duration: Oct 14 2002Oct 17 2002

Publication series

NameICALEO 2002 - 21st International Congress on Applications of Laser and Electro-Optics, Congress Proceedings

Other

OtherICALEO 2002 - 21st International Congress on Applications of Laser and Electro-Optics
CountryUnited States
CityScottsdale, AZ
Period10/14/0210/17/02

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Geochemistry and Petrology

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    Chan, C. L., Campbell, D. W., & Paul, A. E. (2002). The effect of temporal pulse shape on drilling efficiency. In ICALEO 2002 - 21st International Congress on Applications of Laser and Electro-Optics, Congress Proceedings (ICALEO 2002 - 21st International Congress on Applications of Laser and Electro-Optics, Congress Proceedings). Laser Institute of America. https://doi.org/10.2351/1.5065725