A model of passive thermal nondestructive evaluation of composite laminates

Charles, J. A.; Wilson, David G.

doi:10.1002/pc.750020305

Cited by 30 publications

(9 citation statements)

References 10 publications

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“…The thermal conductivity parallel to fibers' direction is nearly five times to that of through-thickness direction [11]. According to the well-known parallel model and Charles and Wilson model [24], k 11 and k 22 in numerical calculation method (NUM) can be demonstrated as…”

Section: Thermal Conductive Prediction Of Complex Composite Materialsmentioning

confidence: 99%

Comparisons of thermal conductive behaviors of epoxy resin in unidirectional composite materials

Dong

Sun

2015

J Therm Anal Calorim

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This paper reports thermal conductive behaviors of three kinds of materials, i.e., epoxy resin bar, carbon fiber bundles/epoxy system, and unidirectional carbon fiber/epoxy lamina along 0°and 90°directions. The apparatus for thermal conduction measurement was manufactured and calibrated with an aluminum bar with known thermal conductivity. The thermal conductive behaviors, including the thermal conductive rate and thermal equilibrium time, were tested and numerically simulated with finite element method. It is found that these materials have similar thermal conductive characteristics with same trends of temperature-time curves and thermal gradient-time curves. In addition, with the increase in fiber volume content or decrease in fiber orientation angle, the thermal conductive rate will be speeded up and thermal equilibrium time will be reduced. The temperature of epoxy resin in composite will increase with the increment of fiber volume content. Due to the existence of interface between fiber and resin, the overall thermal conductive ability of composite will be weakened. Owing to the epoxy resin, carbon fiber bundles/epoxy system and unidirectional carbon fiber/ epoxy lamina are the basic materials for the laminates or complex preform reinforced composites, and the thermal conductive behaviors of these basic materials could be extended to design the thermal conductive behaviors of laminates and complex reinforcement composite materials.

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Section: Thermal Conductive Prediction Of Complex Composite Materialsmentioning

confidence: 99%

Comparisons of thermal conductive behaviors of epoxy resin in unidirectional composite materials

Dong

Sun

2015

J Therm Anal Calorim

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“…There are quite a few differences in the results of the transverse thermal conductivities calculated by different formulas [43]. In this work, the Series Model, Charles Model [44], Pilling Model [45], and Maxwell Model [46] are used to calculate the transverse thermal conductivities, compared with results calculated by the FEM analysis. The temperature and heat flux distributions of carbon fiber rods and carbon fiber bundles are shown in Figures 9 and 10, respectively.…”

Section: Thermal Conductivities Of Carbon Fiber Rods and Carbon Fiber Bundlesmentioning

confidence: 99%

Prediction of Effective Thermal Conductivities of Four-Directional Carbon/Carbon Composites by Unit Cells with Different Sizes

Sun

Shao

2021

Applied Sciences

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Two-unit cells developed to predict the effective thermal conductivities of four-directional carbon/carbon composites with the finite element method are proposed in this paper. The smaller-size unit cell is formulated from the larger-size unit cell by two 180° rotational transformations. The temperature boundary conditions corresponding to the two-unit cells are derived, and the validity is verified by the temperature and heat flux distributions at specific positions of the larger-size unit cell and the smaller-size unit cell. The thermal conductivities of the carbon fiber bundles and carbon fiber rods are measured firstly. Then, combined with the properties of the matrix, the effective thermal conductivities of the four-directional carbon/carbon composites are numerically predicted. The results in transverse direction predicted by the larger-size unit cell and the smaller-size unit cell are both higher than experimental values, which are 5.8 to 6.2% and 7.3 to 8.2%, respectively. In longitudinal direction, the calculated thermal conductivities of the larger-size unit cell and the smaller-size unit cell are 6.8% and 6.2% higher than the experimental results, respectively. In addition, carbon fiber rods with different diameters are set to clarify the influence on the effective thermal conductivities of the four-directional carbon/carbon composites.

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“…Numerous attempts were made to model the anisotropic thermal conductivity of filled polymers or composites. [6][7][8][9][10][11][12][13][14][15] The thermal conductivity is dependent on many different factors, the prominent ones being the properties of the used matrix and fibers, the fiber volume fraction, and the fiber orientation.…”

Section: Introductionmentioning

confidence: 99%

Modeling of the anisotropic thermal conductivity of fabrics embedded in a thermoplastic matrix system

et al. 2021

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Processing of thermoplastic composites is increasingly gaining importance due to their excellent mechanical properties combined with their recycling-feasibility. However, distinguishing anisotropic thermal properties of these materials make process simulation challenging. This work deals with an alternative way of analytical modeling of the anisotropic thermal conductivity of fabrics embedded in a thermoplastic matrix, as in the case of sheets for thermoforming applications, in which heating times are often process limiting. By creation of a unit cell and applying heat flux balances, the thermal conductivity in the fiber direction and in the transversal direction can be calculated. The transversal direction is the most important factor for the addressed thermoforming applications. The proposed model is then successfully validated through Hot Disk measurements of glass fiber reinforced polyamide sheets. Furthermore, authentication is reached by the comparison to measured thermal conductivity values from another study. Hence, it can be shown that the model proves to be more accurate than existing analytical models.

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A model of passive thermal nondestructive evaluation of composite laminates

Cited by 30 publications

References 10 publications

Comparisons of thermal conductive behaviors of epoxy resin in unidirectional composite materials

Comparisons of thermal conductive behaviors of epoxy resin in unidirectional composite materials

Prediction of Effective Thermal Conductivities of Four-Directional Carbon/Carbon Composites by Unit Cells with Different Sizes

Modeling of the anisotropic thermal conductivity of fabrics embedded in a thermoplastic matrix system

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