Finite element simulation and experimental validation of pulsed laser cutting of nitinol

C. H. Fu, M. P. Sealy, Y. B. Guo, X. T. Wei

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Nitinol (NiTi) alloys are widely used in laser cutting of cardiovascular stents due to excellent biomechanical properties. However, laser cutting induces thermal damage, such as heat affected zone (HAZ), micro-cracks, and tensile residual stress, which detrimentally affect product performance. The key process features such as temperature distribution, stress development, and HAZ formation are difficult to measure experimentally due to the highly transient nature. In this study, a design-of-experiment (DOE) based 3-dimensional (3D) finite element simulation was developed to shed light on process mechanisms of laser cutting NiTi. The effects of cutting speed, peak pulse power, and pulse width on kerf width, temperature, stress, and HAZ were investigated. A DFLUX user subroutine was developed to model a moving volumetric (3D) heat flux of a pulsed laser. Also, a material user subroutine was used that incorporated superelasticity and shape memory of NiTi.

Original languageEnglish (US)
Pages (from-to)81-86
Number of pages6
JournalJournal of Manufacturing Processes
Volume19
DOIs
StatePublished - Jan 1 2015

Fingerprint

Pulsed lasers
Heat affected zone
Subroutines
Lasers
Stents
Shape memory effect
Tensile stress
Design of experiments
Heat flux
Residual stresses
Temperature distribution
Cracks
Finite element
Laser
Simulation
Temperature

Keywords

  • FEA
  • Laser cutting
  • NiTi
  • Shape memory alloy
  • Surface integrity

ASJC Scopus subject areas

  • Strategy and Management
  • Management Science and Operations Research
  • Industrial and Manufacturing Engineering

Cite this

Finite element simulation and experimental validation of pulsed laser cutting of nitinol. / Fu, C. H.; Sealy, M. P.; Guo, Y. B.; Wei, X. T.

In: Journal of Manufacturing Processes, Vol. 19, 01.01.2015, p. 81-86.

Research output: Contribution to journalArticle

@article{3c0e9a1fe1c0461fa8c619c2ec86bd6e,
title = "Finite element simulation and experimental validation of pulsed laser cutting of nitinol",
abstract = "Nitinol (NiTi) alloys are widely used in laser cutting of cardiovascular stents due to excellent biomechanical properties. However, laser cutting induces thermal damage, such as heat affected zone (HAZ), micro-cracks, and tensile residual stress, which detrimentally affect product performance. The key process features such as temperature distribution, stress development, and HAZ formation are difficult to measure experimentally due to the highly transient nature. In this study, a design-of-experiment (DOE) based 3-dimensional (3D) finite element simulation was developed to shed light on process mechanisms of laser cutting NiTi. The effects of cutting speed, peak pulse power, and pulse width on kerf width, temperature, stress, and HAZ were investigated. A DFLUX user subroutine was developed to model a moving volumetric (3D) heat flux of a pulsed laser. Also, a material user subroutine was used that incorporated superelasticity and shape memory of NiTi.",
keywords = "FEA, Laser cutting, NiTi, Shape memory alloy, Surface integrity",
author = "Fu, {C. H.} and Sealy, {M. P.} and Guo, {Y. B.} and Wei, {X. T.}",
year = "2015",
month = "1",
day = "1",
doi = "10.1016/j.jmapro.2015.06.005",
language = "English (US)",
volume = "19",
pages = "81--86",
journal = "Journal of Manufacturing Processes",
issn = "1526-6125",
publisher = "Elsevier BV",

}

TY - JOUR

T1 - Finite element simulation and experimental validation of pulsed laser cutting of nitinol

AU - Fu, C. H.

AU - Sealy, M. P.

AU - Guo, Y. B.

AU - Wei, X. T.

PY - 2015/1/1

Y1 - 2015/1/1

N2 - Nitinol (NiTi) alloys are widely used in laser cutting of cardiovascular stents due to excellent biomechanical properties. However, laser cutting induces thermal damage, such as heat affected zone (HAZ), micro-cracks, and tensile residual stress, which detrimentally affect product performance. The key process features such as temperature distribution, stress development, and HAZ formation are difficult to measure experimentally due to the highly transient nature. In this study, a design-of-experiment (DOE) based 3-dimensional (3D) finite element simulation was developed to shed light on process mechanisms of laser cutting NiTi. The effects of cutting speed, peak pulse power, and pulse width on kerf width, temperature, stress, and HAZ were investigated. A DFLUX user subroutine was developed to model a moving volumetric (3D) heat flux of a pulsed laser. Also, a material user subroutine was used that incorporated superelasticity and shape memory of NiTi.

AB - Nitinol (NiTi) alloys are widely used in laser cutting of cardiovascular stents due to excellent biomechanical properties. However, laser cutting induces thermal damage, such as heat affected zone (HAZ), micro-cracks, and tensile residual stress, which detrimentally affect product performance. The key process features such as temperature distribution, stress development, and HAZ formation are difficult to measure experimentally due to the highly transient nature. In this study, a design-of-experiment (DOE) based 3-dimensional (3D) finite element simulation was developed to shed light on process mechanisms of laser cutting NiTi. The effects of cutting speed, peak pulse power, and pulse width on kerf width, temperature, stress, and HAZ were investigated. A DFLUX user subroutine was developed to model a moving volumetric (3D) heat flux of a pulsed laser. Also, a material user subroutine was used that incorporated superelasticity and shape memory of NiTi.

KW - FEA

KW - Laser cutting

KW - NiTi

KW - Shape memory alloy

KW - Surface integrity

UR - http://www.scopus.com/inward/record.url?scp=84931261102&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84931261102&partnerID=8YFLogxK

U2 - 10.1016/j.jmapro.2015.06.005

DO - 10.1016/j.jmapro.2015.06.005

M3 - Article

AN - SCOPUS:84931261102

VL - 19

SP - 81

EP - 86

JO - Journal of Manufacturing Processes

JF - Journal of Manufacturing Processes

SN - 1526-6125

ER -