For the application of continuous fibre-reinforced thermoplastics in car body structures it has to be ensured that they can pass through the automotive paint shop. There are substantial chemical, hygroscopic and thermal impacts throughout this process that can affect the shape of such components. The aim of this study is to model the deformation behaviour of continuous fibre-reinforced thermoplastics under hygrothermal loading. Relaxation tests were performed to assess temperature-dependent and viscoelastic behaviour. Input parameters for temperature and moisture distribution were determined experimentally and computed using finite difference method. A straightforward approach based on classical laminate theory is presented that comprises anisotropic viscoelasticity as well as hygroscopic, thermal and polymer-chemical effects. The introduced phenomenological model was successfully used to describe the deformation of five different laminate layups both dry and fully saturated with moisture.
EgedeP. Electric vehicles, lightweight design and environmental impacts. In: Environmental assessment of lightweight electric vehicles. Springer International Publishing, Cham, 2017, pp. 9–40.
2.
MockP (ed.). European vehicle market statistics: pocketbook 2016/17. Berlin: International Council on Clean Transportation Europe, 2016.
3.
KofflerC andRohde-BrandenburgerK.On the calculation of fuel savings through lightweight design in automotive life cycle assessments. Int J Life Cycle Assess2010;
15: 128–135.
4.
FontarasG andSamarasZ.On the way to 130 g CO2/km – estimating the future characteristics of the average European passenger car. Energy Policy2010;
38: 1826–1833.
5.
Albrecht S, Baumann M,Brandstetter CP, et al.Environmental aspects of lightweight construction in mobility andmanufacturing. In: Green design,materials and manufacturingprocesses.(ed Bartolo HM, Da Silva Bartolo, Paulo Jorge, Alves NMF, Mateus AJ,AlmeidaHA, Lemos ACS, et al.). BocaRaton: CRC Press.
6.
HahnHT andTsaiSW.Introduction to composite materials.
Boca Raton:
CRC Press, 1980.
7.
JonesRM.Mechanics of composite materials.
Washington, DC:
Scripta Book Company, 1975.
ChristensenRM.Mechanics of composite materials. North Chelmsford: Courier Corporation, 2012.
10.
BandyopadhyayT andKarmakarA.Bending characteristics of delaminated cross-ply composite shallow conical shells in hygrothermal environment. J Reinf Plast Compos2015;
34: 1724–1735.
11.
CoimbraRN andOteroM.A continuous process for the production of a fabric reinforced polymeric matrix. J Reinf Plast Compos2015;
34: 1662–1672.
12.
BuschhoffCBrecherCEmontsM.High volume production of lightweight automotive structures. In: BargendeMReussH-CWiedemannJ (eds) Automobil- und motorentechnik.
Wiesbaden:
Springer Vieweg, 2016, pp. 213–226.
13.
GrätzlTSchrammNKrollL. Influence of the cathodic dip painting process on fibre-reinforced thermoplastic composites. In: Borgmann H (ed.) ITHEC 2016: proceedings of the 3rd international conference and exhibition on thermoplastic composites. 1st edition. Bremen, Germany, 11–12 October 2016, pp. 33–36.
14.
KhanLAMahmoodAHHassanBet al.
Cost‐effective manufacturing process for the development of automotive from energy efficient composite materials and sandwich structures. Polym Compos2014;
35: 97–104.
15.
VieilleB andAlbouyW.Influence of matrix ductility on the high-temperature fatigue behaviour of notched and unnotched thermoplastic and thermoset laminates. J Reinf Plast Compos2015;
34: 1755–1764.
16.
MazumdarS.Composites manufacturing: materials, product, and process engineering.
Boca Raton:
CRC Press, 2001.
17.
ChilaliAZouariWAssararMet al.
Analysis of the mechanical behaviour of flax and glass fabrics-reinforced thermoplastic and thermoset resins. J Reinf Plast Compos2016;
35: 1217–1232.
18.
van LochemJHHenriksenC andLundHH.Recycling concepts for thermoplastic composites. J Reinf Plast Compos1996;
15: 864–876.
19.
Licea-ClaveríeAValdezJOGarcía-HernándezEet al.
Reprocessing effects on the properties of a hybrid nylon 6, 6-composite reinforced with short glass and carbon fibers. J Reinf Plast Compos2002;
21: 847–856.
20.
BoriaSScattinaABelingardiG.Experimental evaluation of a fully recyclable thermoplastic composite. Compos Struct2016;
140: 21–35.
ChiassonM andLaliberteJ.In situ measurement of vacuum consolidation of commingled thermoplastic composites using a non-contact displacement sensor. J Reinf Plast Compos2014;
33: 2046–2063.
23.
BoccardiSMeolaCCarlomagnoGMet al.
Effects of interface strength gradation on impact damage mechanisms in polypropylene/woven glass fabric composites. Compos Part B Eng2016;
90: 179–187.
24.
MichalosGMakrisSPapakostasNet al.
Automotive assembly technologies review: challenges and outlook for a flexible and adaptive approach. CIRP J Manuf Sci Technol2010;
2: 81–91.
25.
StreitbergerH-J andDosselK-F.Automotive paints and coatings: Hoboken: John Wiley & Sons, 2008.
26.
VDI/DIN commission on air pollution prevention (KRdL) – standards committee VDI guideline 3445. Emission control – high-volume car body painting plants.
27.
AkafuahNKPoozeshSSalaimehAet al.
Evolution of the automotive body coating process – a review. Coatings2016;
6: 24.
28.
NarayananTS.Surface pretreatment by phosphate conversion coatings – a review. Rev Adv Mater Sci2005;
9: 130–177.
29.
HardikarNRatneshKVenkateshaNet al. Prediction of thermoplastic fender behavior during E-coat bake cycle-part 1: FEA methodology and problem formulation. SAE Technical Paper, 1 January 2010.
30.
KancharlaAKHardikarNATankalaTCet al. Prediction of thermoplastic fender behavior during E-coat bake cycle-part 2: influence of temperature distribution. SAE Technical Paper, 1 January 2010.
31.
Roylance, D. Engineering viscoelasticity. Departmentof Materials Science and Engineering–Massachusetts Institute of Technology, Cambridge MA, 2139 (2001), pp. 1–37.
32.
HardikarNABobbaS andJhaR.Applicability of time temperature superposition principle to an immiscible blend of polyphenyleneoxide and polyamide. J Polym Eng2011;
31: 223–236.
33.
BradshawRD andBrinsonLC.Mechanical response of linear viscoelastic composite laminates incorporating non-isothermal physical aging effects. Compos Sci Technol1999;
59: 1411–1427.
34.
CliffordSJanssonNYuWet al.
Thermoviscoelastic anisotropic analysis of process induced residual stresses and dimensional stability in real polymer matrix composite components. Compos Part A Appl Sci Manuf2006;
37: 538–545.
35.
YangJ-LZhangZSchlarbAKet al.
On the characterization of tensile creep resistance of polyamide 66 nanocomposites. Part I. Experimental results and general discussions. Polymer2006;
47: 2791–2801.
36.
WilliamsMLLandelRF andFerryJD.The temperature dependence of relaxation mechanisms in amorphous polymers and other glass-forming liquids. J Am Chem Soc1955;
77: 3701–3707.
37.
SunderlandPYuW andMånsonJ-A.A thermoviscoelastic analysis of process-induced internal stresses in thermoplastic matrix composites. Polym Compos2001;
22: 579–592.
38.
CarrascalICasadoJAPolancoJAet al.
Absorption and diffusion of humidity in fiberglass‐reinforced polyamide. Polym Compos2005;
26: 580–586.
39.
IshisakaA andKawagoeM.Examination of the time–water content superposition on the dynamic viscoelasticity of moistened polyamide 6 and epoxy. J Appl Polym Sci2004;
93: 560–567.
40.
SomiyaSLeeY andSakaiT. Time-temperature and humidity superposition principle on creep of PBS. In: Proceeding of the XIth international congress and exposition, Orlando, 2–5 June 2008.
41.
JohnstonAVaziriR andPoursartipA.A plane strain model for process-induced deformation of laminated composite structures. J Compos Mater2001;
35: 1435–1469.
42.
SchürmannH.Konstruieren mit Faser-Kunststoff-Verbunden. Berlin, Heidelberg, New York: Springer, 2005.
43.
Celanese Chemical Europe GmbH. Celstran® CFR-TP PA6 CF60-01 Technical Data Sheet, 2014.
44.
BogettiTAGillespieJWJr.
Process-induced stress and deformation in thick-section thermoset composite laminates. J Compos Mater1992;
26: 626–660.
45.
ChapmanTJGillespieJWJrPipesRBet al.
Prediction of process-induced residual stresses in thermoplastic composites. J Compos Mater1990;
24: 616–643.
46.
WeitsmanY.Optimal cool down in nonlinear thermoviscoelasticity with application to graphite/PEEK (APC-2) laminates. J Appl Mech1994;
61: 367.
47.
EhardSMaderALadstätterEet al. Thermoplastic automated fiber placement for manufacturing of metal-composite hybrid parts. In: Euro hybrid materials and structures 2016, Kaiserslautern, Germany, 20–21 April 2016, pp. 129–134.
48.
ArhantMLe GacP-YLe GallMet al.
Effect of sea water and humidity on the tensile and compressive properties of carbon-polyamide 6 laminates. Compos Part A Appl Sci Manuf2016;
91: 250–261.
49.
CrankJ.The mathematics of diffusion.
Oxford:
Oxford University Press, 1979.
RopersSKardosM andOsswaldTA.A thermo-viscoelastic approach for the characterization and modeling of the bending behavior of thermoplastic composites. Compos Part A Appl Sci Manuf2016;
90: 22–32.
52.
GienckeE andMederG.Calculation of the creep function for two dimensional loaded resins and GF-UP from the experimental values for uniaxial loaded resins. Materialpruefung1981;
23: 69–74.
53.
NielsenMW.Predictions of process induced shape distortions and residual stresses in large fibre reinforced composite laminates. PhD Thesis, Technical University of Denmark, Lyngby, Denmark, 2012.
54.
CarslawHS andJaegerJC.Conduction of heat in solids. Oxford: Clarendon Press, 1960.
