A thermal stress and failure model for laser cutting and forming operations

R. Akarapu, B. Q. Li, Albert Eliot Segall

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

A transient, full three-dimensional mathematical model that describes the ablation phenomena, the thermal stress evolution, and the failure process that occur during laser cutting or forming operations on ceramic plates is developed. The model development is based on the finite element simulation of thermal field and stress development during laser cutting or forming operations. To treat the ablation phenomena during laser cutting, a fixed-grid algorithm is applied to handle complex ablation geometries with discontinuities. This algorithm is essential for applications to multiple-laser cutting operations. The thermal and stress evolution model is further integrated with a probabilistic fracture model to assess the failure probability during both laser cutting and forming processes. Numerical results show that the groove shapes as well as the temperature and stress distributions are similar in front of the cutting laser for both single and dual lasers but differ in the region when the lead laser becomes effective in dual-beam machining.

Original languageEnglish (US)
Pages (from-to)51-62
Number of pages12
JournalJournal of Failure Analysis and Prevention
Volume4
Issue number5
DOIs
StatePublished - Oct 1 2004

Fingerprint

Thermal stress
Lasers
Ablation
Stress concentration
Machining
Temperature distribution
Lead
Mathematical models
Geometry

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Safety, Risk, Reliability and Quality
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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abstract = "A transient, full three-dimensional mathematical model that describes the ablation phenomena, the thermal stress evolution, and the failure process that occur during laser cutting or forming operations on ceramic plates is developed. The model development is based on the finite element simulation of thermal field and stress development during laser cutting or forming operations. To treat the ablation phenomena during laser cutting, a fixed-grid algorithm is applied to handle complex ablation geometries with discontinuities. This algorithm is essential for applications to multiple-laser cutting operations. The thermal and stress evolution model is further integrated with a probabilistic fracture model to assess the failure probability during both laser cutting and forming processes. Numerical results show that the groove shapes as well as the temperature and stress distributions are similar in front of the cutting laser for both single and dual lasers but differ in the region when the lead laser becomes effective in dual-beam machining.",
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A thermal stress and failure model for laser cutting and forming operations. / Akarapu, R.; Li, B. Q.; Segall, Albert Eliot.

In: Journal of Failure Analysis and Prevention, Vol. 4, No. 5, 01.10.2004, p. 51-62.

Research output: Contribution to journalArticle

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