Simulation of curing process of carbon/epoxy composite during autoclave degassing molding by considering phase changes of epoxy resin

Abstract Strain monitoring of a carbon/epoxy composite cross-ply laminate ([05/905]s) during thermoforming was conducted by using fiber Bragg grating (FBG) sensors. The entire process was simulated by employing finite element analysis (FEA) by taking into consideration the phase changes of the epoxy resin. For the precise simulation of the curing process, a dielectrometry sensor was used to detect the epoxy-resin dissipation factor, which in turn was used to identify the curing point. To investigate the phase changes and consolidation of the composite laminate by employing FEA, modulus changes with temperature were measured by dynamic mechanical analysis (DMA), and the permeability was estimated by measuring the fiber volume fraction according to the curing temperature. As the epoxy resin changed from a liquid to solid phase, the strain generated along the carbon fibers dynamically changed, and the analysis results generally predicted the strain variation quite well. To apply this simulation technique to practical structures, a composite-aluminum hybrid wheel was analyzed and experimentally verified.

[1]  Mpf Sutcliffe,et al.  Compressive characteristics of foam-filled composite egg-box sandwich panels as energy absorbing structures , 2010 .

[2]  K. Yoon,et al.  Prediction of Thermal Expansion Properties of Carbon/Epoxy Laminates for Temperature Variation , 2000 .

[3]  Graham T. Reed,et al.  Disbond growth detection in composite-composite single-lap joints using chirped FBG sensors , 2008 .

[4]  Wen-Bin Young,et al.  Consolidation and cure simulations for laminated composites , 1996 .

[5]  O. Frazão,et al.  On the improvement of strain measurements with FBG sensors embedded in unidirectional composites , 2013 .

[6]  Kenneth T. V. Grattan,et al.  Enhanced FBG sensor-based system performance assessment for monitoring strain along a prestressed CFRP rod in structural monitoring , 2009 .

[7]  Rhys Jones,et al.  Development of life extension strategies for Australian military aircraft, using structural health monitoring of composite repairs and joints , 2004 .

[8]  Philippe Olivier,et al.  Assessment of cure residual strains through the thickness of carbon–epoxy laminates using FBGs, Part I: Elementary specimen , 2009 .

[9]  S. Agius,et al.  Cure behaviour and void development within rapidly cured out-of-autoclave composites , 2013 .

[10]  Seung-Hwan Chang,et al.  Design of μ-CNC machining centre with carbon/epoxy composite–aluminium hybrid structures containing friction layers for high damping capacity , 2010 .

[11]  Roberto Lopez-Anido,et al.  Structural health monitoring of marine composite structural joints using embedded fiber Bragg grating strain sensors , 2009 .

[12]  N. Zahlan,et al.  Design and fabrication of composite components; the spring-forward phenomenon , 1989 .

[13]  Seung‐Hwan Chang,et al.  An experimental study on the effect of tow variations on compressive characteristics of plain weave carbon/epoxy composites under compressions , 2010 .

[14]  R. A. Shenoi,et al.  A procedure to embed fibre Bragg Grating strain sensors into GFRP sandwich structures , 2007 .

[15]  M. Marchetti,et al.  Process simulation for a large composite aeronautic beam by resin transfer molding , 2014 .

[16]  D. Lee,et al.  Reduction of fabricational thermal residual stress of the hybrid co-cured structure using a dielectrometry , 2007 .

[17]  Peter D. M. Spelt,et al.  A model for resin viscosity during cure in the resin transfer moulding process , 2002 .

[18]  Ignace Verpoest,et al.  Local strain in a 5-harness satin weave composite under static tension: Part I - Experimental analysis , 2011 .

[19]  R. Farris,et al.  Evolution of residual stresses in three-dimensionally constrained epoxy resins , 1990 .

[20]  Sean McKee,et al.  Curing simulation of thermoset composites , 1999 .

[21]  E. Archer,et al.  Internal strain measurement and cure monitoring of 3D angle interlock woven carbon fibre composites , 2014 .

[22]  Anoush Poursartip,et al.  An experimental method for quantifying tool–part shear interaction during composites processing , 2003 .

[23]  Libo Yuan,et al.  Strain monitoring in FRP laminates and concrete beams using FBG sensors , 2001 .

[24]  Chun-Gon Kim,et al.  The embedment of fiber Bragg grating sensors into filament wound pressure tanks considering multiplexing , 2006 .

[25]  Thomas Gmür,et al.  Residual strain development in an AS4/PPS thermoplastic composite measured using fibre Bragg grating sensors , 2006 .

[26]  Je Hoon Oh,et al.  Cure Cycle for Thick Glass/Epoxy Composite Laminates , 2002 .

[27]  In situ cure monitoring of adhesively bonded joints by dielectrometry , 2003 .

[28]  Javid Bayandor,et al.  Damage assessment and monitoring of composite ship joints , 2005 .

[29]  W. Van Paepegem,et al.  On the feasibility of optical fibre sensors for strain monitoring in thermoplastic composites under fatigue loading conditions , 2009 .

[30]  Seung‐Hwan Chang,et al.  Changes in tow geometry of plain-weave carbon/epoxy fabrics draped onto compliant hemisphere molds , 2006 .

[31]  Seung-Hwan Chang,et al.  In situ monitoring of the strain evolution and curing reaction of composite laminates to reduce the thermal residual stress using FBG sensor and dielectrometry , 2013 .

[32]  Anand Asundi,et al.  Structural health monitoring of smart composite materials by using EFPI and FBG sensors , 2003 .