Modeling of Non-Equilibrium Deformation in a Double-Layered Thin Film During Ultrashort Laser Heating

Xiong, Qingrong; Tian, Xiaogeng

doi:10.1080/01495739.2013.770358

Cited by 4 publications

(3 citation statements)

References 27 publications

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“…It is known that a femtosecond laser pulse could result in extremely high temperatures and strain rates, resulting in unavailability of material thermophysical properties in such situations [12][13][14]. However, the methods used in previous studies are all based on continuum mechanics [4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Ultrafast thermomechanical responses of a copper film under femtosecond laser trains: a molecular dynamics study

Xiong

Tian

2015

Proc. R. Soc. A.

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Using molecular dynamics (MD) simulation, the ultrafast thermomechanical coupling responses of an immense homogeneous, isotropic copper film with the thickness of 1 μm, which is irradiated by various ultra-short laser pulse trains, are investigated. For the same energy injection, the effect of laser pulse trains is studied and it is observed from the numerical results that the pulse train technology may improve the ultrafast thermomechanical responses of the film significantly. By thoroughly analysing temperature, stress and displacement (strain) of the film, the thermomechanical coupling characteristics between stress, displacement (strain) and temperature are presented perfectly at the atomic scale. It is found that the lattice temperature of the region under tensile stress (or compressive stress) is lower (or higher) than the lattice temperature of the surrounding region, and the positive and negative strain (tensile or compressive) is related to tensile and compressive stress very well.

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Section: Introductionmentioning

confidence: 99%

Ultrafast thermomechanical responses of a copper film under femtosecond laser trains: a molecular dynamics study

Xiong

Tian

2015

Proc. R. Soc. A.

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“…Therefore, within the heated spot the thermal transport can be treated as a 1D process and the mechanical response is in a state of uni-axial strain but 3D stress. [15,16] The field equations of the ultrafast thermoelasticity (UTE) model developed by Chen et al [13] extending the dual-hyperbolic two-step heat transfer and hot-electron blast models [14] are given as follows: heat conduction equations τ e (T e ) qe + 𝑞 e = −K e (T e , T l ) ∇T e ,…”

Section: Mathematical Modelmentioning

confidence: 99%

“…The finite element method is applied to solve the problem in the present work due to the successful usage of finite element method in the investigations of thermomechanical responses of metallic films under ultrashort pulse laser heating. [15,16]…”

Section: Introductionmentioning

confidence: 99%

Effect of ballistic electrons on ultrafast thermomechanical responses of a thin metal film

Xiong

Tian

2017

Chinese Phys. B

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The ultrafast thermomechanical coupling problem in a thin gold film irradiated by ultrashort laser pulses with different electron ballistic depths is investigated via the ultrafast thermoelasticity model. The solution of the problem is obtained by solving finite element governing equations. The comparison between the results of ultrafast thermomechanical coupling responses with different electron ballistic depths is made to show the ballistic electron effect. It is found that the ballistic electrons have a significant influence on the ultrafast thermomechanical coupling behaviors of the gold thin film and the best laser micromachining results can be achieved by choosing the specific laser technology (large or small ballistic range). In addition, the influence of simplification of the ultrashort laser pulse source on the results is studied, and it is found that the simplification has a great influence on the thermomechanical responses, which implies that care should be taken when the simplified form of the laser source term is applied as the Gaussian heat source.

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Size-dependent thermoelasticity of a finite bi-layered nanoscale plate based on nonlocal dual-phase-lag heat conduction and Eringen’s nonlocal elasticity

Xue

Cao

Liu

2020

Appl. Math. Mech.-Engl. Ed.

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Modeling of Non-Equilibrium Deformation in a Double-Layered Thin Film During Ultrashort Laser Heating

Cited by 4 publications

References 27 publications

Ultrafast thermomechanical responses of a copper film under femtosecond laser trains: a molecular dynamics study

Ultrafast thermomechanical responses of a copper film under femtosecond laser trains: a molecular dynamics study

Effect of ballistic electrons on ultrafast thermomechanical responses of a thin metal film

Size-dependent thermoelasticity of a finite bi-layered nanoscale plate based on nonlocal dual-phase-lag heat conduction and Eringen’s nonlocal elasticity

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