Interaction of a high-power laser beam with metal sheets

Boley, C. D.; Cutter, K.; Fochs, S.N.; Pax, Paul H.; Rotter, Mark D.; Rubenchik, Alexander M.; Yamamoto, R.

doi:10.1063/1.3284204

Cited by 35 publications

(15 citation statements)

References 4 publications

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“…They showed that influence of scanning lines on stress levels was notably high, which was associated with microstructural changes in the heated region. Laser heating of metallic sheets was examined by Boley et al [3] They indicated that as laser softens the metallic sheet during the heating period and pressure difference between the front and back surface of the workpiece due to high pressure air blow caused the workpiece to bulge into the shape desired. A model study for laser bending of pre-loaded sheet metals was carried out by Guon et al [4].…”

Section: Introductionmentioning

confidence: 99%

Multi-Beam Laser Heating of Steel: Temperature and Thermal Stress Analysis

Shuja

Yilbaş

2012

Transactions of the Canadian Society for Mechanical Engineering

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Laser multi-beam heating of steel sheet surface is considered. The irradiated laser spots are located along an arc to increase heated surface area during laser scanning at a constant speed. Temperature and stress fields are predicted for various number of spots along the arc. It is found that temperature and stress fields in the irradiated substrate can be controlled through proper selection of the number of irradiated spots along the arc. Increasing number of irradiated spots results in development of almost uniform high temperature and high stress fields around the arc; however, local heating and discontinuous stress field giving rise to large differences in von Mises stress occurring for reduced number of spots in the arc.

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Section: Introductionmentioning

confidence: 99%

Multi-Beam Laser Heating of Steel: Temperature and Thermal Stress Analysis

Shuja

Yilbaş

2012

Transactions of the Canadian Society for Mechanical Engineering

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“…So conclusion may be reached that the major cause of bulging is heating up, while that the breakup of the thin plates relates to two main factors: the aerodynamic force exerted by the gasflow and the softening of the material by the incident laser. Boley also studied this phenomenon [2] . He attributes the bulging and breakup of the thin plates to the pressure difference between the two sides of the plates cause by the gasflow.…”

Section: Thin Aluminum Plates Irradiated Under Surface Gasflowmentioning

confidence: 96%

“…Boley finds in the experiments [2] that, when the laser spot is relatively large, a small hole is first formed on the downwind side of the thin plate. This shows that when the plate bulges, the change in the flow pattern over the bulge results in localized aerodynamic force distribution.…”

Section: Thin Aluminum Plates Irradiated Under Surface Gasflowmentioning

confidence: 97%

Laser irradiation effects on metal or composite plates subjected to surface flow

et al. 2013

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The irradiation effects are studied, of solid-state laser on four kinds of plates (three of them are made of metal, the other, of composite), in experiments characterized by relatively large laser spot and the presence of surface flow. The thick iron samples, thin aluminum samples and thin carbon fiber/epoxy resin samples are subjected to air or N 2 surface flow, while the box-shaped samples, containing a thin aluminum plate irradiated by laser, are filled with water. It is found that, besides the common role in all four cases cooling the plate by convective heat transfer, the fluid plays other different roles in different case influencing the dynamic response of the plate. The roles of the fluid in each case are described either with analytical boundary conditions or with differential equations, which are then incorporated into computational models. Numerical simulations are carried out, with results compared with the experiment results to explain the irradiation effects.

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“…This airflow also eliminates the oxide produced by the oxidation of material and supplies extra oxygen. In addition, airflow causes pressure difference between two surfaces of thin-plate targets, leading to a premature rupture at the temperature well below the melting point [27]. Numerical analyses are also performed to examine the laser damage of composite materials in supersonic airflow [28].…”

Section: Introductionmentioning

confidence: 99%