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  • Open Access


    A Methodology to Reduce Thermal Gradients Due to the Exothermic Reactions in Resin Transfer Molding Applications

    Aouatif Saad1,*, Mohammed EL Ganaoui2

    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.1, pp. 95-103, 2023, DOI:10.32604/fdmp.2023.022014

    Abstract Resin transfer molding (RTM) is among the most used manufacturing processes for composite parts. Initially, the resin cure is initiated by heat supply to the mold. The supplementary heat generated during the reaction can cause thermal gradients in the composite, potentially leading to undesired residual stresses which can cause shrinkage and warpage. In the present numerical study of these processes, a one-dimensional finite difference method is used to predict the temperature evolution and the degree of cure in the course of the resin polymerization; the effect of some parameters on the thermal gradient is then analyzed, namely: the fiber nature,… More >

  • Open Access


    Numerical Study on the Resin Transfer Molding Curing Process for Thick Composites Materials

    Rida Tazi1, Adil Echchelh1, Mohammed Hattabi2, Mohammed El Ganaoui3, Aouatif Saad4,*

    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.1, pp. 223-232, 2023, DOI:10.32604/fdmp.2023.021976

    Abstract The successful manufacture of thick composites is challenging since the highly exothermic nature of thermoset resins and limited temperature control make avoiding the onset of detrimental thermal gradients within the composite relatively difficult. This phenomenon is mainly caused by exothermic heat reactions. The so-called Michaud's model has been largely used in the literature to reduce the gap between experience and simulation with regard to the effective prediction of the temperature cycle in these processes. In this work, another solution is proposed to simulate the curing process for thick composites, namely preheating the resin to activate the curing reaction before resin… More >

  • Open Access


    An Alternative Approach to Minimize the Convection in Growing a Large Diameter Single Bulk Crystal of Si0.25Ge0.75 Alloy in a Vertical Bridgman Furnace

    M. M. Shemirani1, M. Z. Saghir2

    FDMP-Fluid Dynamics & Materials Processing, Vol.9, No.1, pp. 11-21, 2013, DOI:10.3970/fdmp.2013.009.011

    Abstract Producing homogeneous single bulk crystals requires a good understanding of the thermo-solutal behavior in the solvent region. This study explores simulation of the growth of large diameter single bulk crystals of silicon and germanium alloy from its melt utilizing Bridgman method. Both thermal and solutal diffusion of silicon and germanium in the molten SiGe alloy are of interest. It was observed that the diffusion dominates the transport phenomenon in the solvent region especially in the first 25 mm of the model due to having a PeT <<1. It was also found that the control of both radial and axial applied… More >

  • Open Access


    Investigating Creep Performance and Predicting Rupture Time for Rotating FGM Disc under Different Thermal Gradients

    K. Khanna1,2, V.K. Gupta3, S.P. Nigam1

    CMC-Computers, Materials & Continua, Vol.48, No.3, pp. 147-161, 2015, DOI:10.3970/cmc.2015.048.147

    Abstract A mathematical model is developed to describe the steady state creep in a rotating Al-SiCp disc having a non-linear thickness profile and distribution of SiC particles along the radial direction. The model is used to investigate the effect of imposing three different kinds of radial temperature profiles viz. linear, parabolic and exponential with fixed values of inner and outer surface temperatures, on the creep stresses and strain rates. It is noticed that by increasing the temperature exponent (nT), the radial stress (over the entire radius) and tangential stress (near the inner radius) increase in the disc. However, the tangential stress… More >

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