Investigating the mechanical properties and microstructure of the weld joint obtained by laser welding of <scp>PA12</scp>/<scp>CNT</scp> nanocomposites

Samadi, Mohammad Reza; Afshari, Mahmoud; Nasehi, Mohammadhossein; Hardani, Hatam

doi:10.1002/pen.26313

Cited by 3 publications

(2 citation statements)

References 50 publications

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“…The simulation was carried out using the commercial finite element software COMSOL Multiphysics®, which implemented a volume heat source to model the absorption of laser radiation in the transparent‐absorbent substrates. The model proposed in this study for the laser power profile at the interface is based on the classical model presented in previous literature 2,6,13 . In this model, the laser beam power propagated through the transparent component is modeled in terms of a Gaussian beam as described in Equation (1):

I (X, Y, Z) = \frac{(1 - R_{s}) \times δ (Z) \times P_{O}}{2 π {σ_{0}}^{2}} \exp [- (\frac{X {((), t)}^{2}}{2 {σ_{0}}^{2}} + \frac{{Y_{0}}^{2}}{2 {σ_{0}}^{2}})] .

Where P 0 is the initial laser power,

σ_{0}

is the initial surface distribution,

R_{s}

is the reflection coefficient, and

δ (Z)

is the light scattering ratio.…”

Section: Numerical Model Used For Inverse Methodsmentioning

confidence: 99%

“…To achieve optimal weld quality and the mechanical performances, it is necessary to have a precise prediction of the laser intensity distribution at the weld interface 12 . Samadi et al in reference, 13 have presented the effect of the laser transmission welding (LTW) process parameters on the mechanical strengths of the welded polymer composites components. They have demonstrated that laser power and laser speed have a significant influence on the mechanical strength of the produced assemblies.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Laser intensity and surface distribution identification at weld interface during laser transmission welding of thermoplastic polymers: A combined numerical inverse method and experimental temperature measurement approach

Asseko

Nguyen

et al. 2023

Polymer Engineering & Sci

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The determination of the laser intensity profile necessary to weld two thermoplastic parts is crucial for understanding and optimizing the laser welding process in polymers and composite materials. Traditional methods of measuring the laser beam intensity profile, such as laser beam profiling techniques, can be difficult to implement and expensive. In this paper, we present the development of a technique that combines a numerical inverse method with experimental temperature measurements to determinate the laser intensity distribution at the weld interface. This technique does not require specialized or expensive equipment and accounts for variations in laser beam intensity caused by different components and interfaces. The technique uses thermocouple sensors to measure interface temperatures during welding, and an analytical gaussian model to estimate the laser intensity distribution at the weld interface. The model is then used as input data in a numerical heat transfer model. The technique is validated through experimental investigations on transparent and absorbent Polylactic acid polymers.

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I (X, Y, Z) = \frac{(1 - R_{s}) \times δ (Z) \times P_{O}}{2 π {σ_{0}}^{2}} \exp [- (\frac{X {((), t)}^{2}}{2 {σ_{0}}^{2}} + \frac{{Y_{0}}^{2}}{2 {σ_{0}}^{2}})] .

Where P 0 is the initial laser power,

σ_{0}

is the initial surface distribution,

R_{s}

is the reflection coefficient, and

δ (Z)

is the light scattering ratio.…”

Section: Numerical Model Used For Inverse Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Laser intensity and surface distribution identification at weld interface during laser transmission welding of thermoplastic polymers: A combined numerical inverse method and experimental temperature measurement approach

Asseko

Nguyen

et al. 2023

Polymer Engineering & Sci

View full text Add to dashboard Cite

show abstract

Simultaneous enhancement of the impact strength and tensile modulus of PP/EPDM/TiO2 nanocomposite fabricated by fused filament fabrication

Taher,

Afshari,

Houmani

et al. 2023

Colloid Polym Sci

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An improvement in the mechanical properties of polypropylene/ethylene-propylene-diene monomer/titanium dioxide nanocomposite obtained by fused filament fabrication

Xu,

Chen,

Zheng

et al. 2024

Journal of Thermoplastic Composite Materials

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In the present research, the PP/EPDM/TiO2 nanocomposite was fabricated using the fused filament fabrication process to improve the mechanical properties of the obtained samples. For this purpose, first the response surface methodology was used to investigate the effect of TiO2 content, nozzle temperature and printing speed on the responses of tensile strength and elongation. Then, the desirability function method was applied to find the optimal condition of the process parameters. The fracture surface of the tensile samples was also studied by scanning electron microscopy, differential scanning calorimetry and thermogravimetric analysis to find a relationship between the microstructure and mechanical properties of the fabricated samples. The results indicated that the highest elongation of samples (144.9%) was attained at a TiO2 content of 4 wt%, while the tensile strength of samples was maximized (24.6 MPa) at a TiO2 content of 2 wt% due to fine dispersion of the nanoparticles. An increase in the nozzle temperature from 200 to 225°C led to an enhancement in the tensile strength (11.2%) and elongation (15.7%) of samples because of the good viscosity of the filament, whereas the tensile strength (6.6%) and elongation (11.1%) of samples were decreased with the increase of nozzle temperature from 225 to 250°C because of the thermal degradation of filament. Moreover, when the printing speed raised from 20 to 40 mm/s, the tensile strength initially improved by 2.7% and then decreased by 1.2%, but the elongation continuously decreased by 6.3%. Nevertheless, the concurrent enhancement of the tensile strength and elongation has been obtained at a TiO2 content of 2.5 wt%, nozzle temperature of 227°C and printing speed of 28 mm/s.

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Investigating the mechanical properties and microstructure of the weld joint obtained by laser welding of PA12/CNT nanocomposites

Cited by 3 publications

References 50 publications

Laser intensity and surface distribution identification at weld interface during laser transmission welding of thermoplastic polymers: A combined numerical inverse method and experimental temperature measurement approach

Laser intensity and surface distribution identification at weld interface during laser transmission welding of thermoplastic polymers: A combined numerical inverse method and experimental temperature measurement approach

Simultaneous enhancement of the impact strength and tensile modulus of PP/EPDM/TiO2 nanocomposite fabricated by fused filament fabrication

An improvement in the mechanical properties of polypropylene/ethylene-propylene-diene monomer/titanium dioxide nanocomposite obtained by fused filament fabrication

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