Journal of Science and Technology of Composites

Journal of Science and Technology of Composites

Calculation of calibration factors for determination of residual stresses in fiber-metal laminates using incremental hole-drilling method

Document Type : Research Paper

Authors
AhmadReza Ghasemi
MohammadMahdi Mohammadi
Department of Mechanical Engineering, Kashan University, Kashan, Iran .
Abstract
Fiber metal laminates (FMLs) are new types of hybrid composites consisting of metallic layers and fiber-reinforced composite materials. Researches on these materials are increasing because they are new and their features are considerable. Residual stresses in the FMLs are inevitable because of different reasons, such as mismatch between thermo mechanical properties of laminated composite and metallic layers, different staking sequence, curing cycle and method of fabrication. One of the most useful semi-destructive techniques for measuring the residual stresses is the hole-drilling method. Measurement of residual stresses by central hole-drilling method is not possible due to the non-uniform residual stress fields through the thickness of laminated composites. Therefore, a development of the hole-drilling method to determine the residual stresses in each lamina is necessary. In this study, a finite element method is used to obtain the calibration coefficients. These coefficients make a relation between released strains and residual stresses in each lamina of FMLs materials. Numerical results of this research have a good agreement with the finite element studies conducted by other researchers. In addition, the results demonstrate that the calibration coefficients matrix of the metallic layers become un-symmetric because of exsitig of composite laminates in the structure of the FMLs
Keywords
Fiber metal laminate
Integral method
Calibration coefficients
Residual stress
Finite element method
[1] Carrillo, J.G. and Cantwell, W.J.: Mechanical properties of a novel fiber-metal laminate based on a polypropylene composite. Mechanics of Materials, vol. 41, 2009, pp. 828–838.
[2] Sinmazcelik, T., Avcu, E. and Coban, O.: A review: Fibre metal laminates, background, bonding types and applied test methods. Materials and Design, vol. 32, 2011, pp. 3671–3685.
[3] Alderliesten, R.: On the development of hybrid material concepts for aircraft structures. Recent Patents Engineering, vol.3, 2009, pp. 25-38.
[4] Shivakumar, P.S., Galaveen, S.C., Siddaramaiah and Jawali, D.: Effect of glass/nylon coated aluminum fibers on torsional properties of epoxy polymer composite shafts. Malaysian Polymer Journal, vol. 9, no.1, 2014, pp. 33-38.
[5] Ardakani, M.A., Khatibi, A.A. and Ghazavi, A.: A study on the manufacturing of Glass Fiber Reinforced Aluminum Laminates and the effect of interfacial adhesive bonding on the impact behavior. International Congress and Exposition, 2008.
[6] Mahesh, M., Kumar, A.S.: Comparison of Mechanical Properties for Aluminium Metal Laminates (GLARE) Of Three Different Orientations Such As CSM, Woven Roving and 45o Stitched Mat. Journal of Mechanical and Civil Engineering (IOSR-JMCE), e-ISSN: 2278-1684, p-ISSN: 2320-334XX, pp. 09-13.
[7] Rossini, N.S., Dassisti, M., Benyounis, K.Y. and Olabi, A.G.: Methods of Measuring Residual Stresses in Components. Materials and Design, vol. 35, 2012, pp. 572–588.
[8] Safarabadi, M.: Prediction of calibration factors of the hole-drilling method for orthotropic composites including hybrid interphase region. Journal of Composite materials, DOI: 10.1177/0021998314529680, 2014.
[9] Standard Test Method for Determining Residual Stresses by the Hole-Drilling Strain Gage Method, Annual Book of ASTM Standard, 03.01, 2008.
[10] Shokrieh, M.M. and Ghasemi, A.R.: Simulation of Central Hole-Drilling Process for Measurement of Residual Stresses in Isotropic, Orthotropic, and Laminated Composite Plates.  Journal of Composite materials, vol. 41, no. 4, 2007, pp. 435-52.
[11] Shokrieh, M.M. and Ghasemi, A.R.: Determination of Calibration Factors of the Hole Drilling Method for Orthotropic Compositesusing an Exact Solution. Journal of Composite materials, vol. 19, 2007, pp. 2293-311.
[12]Shokrieh, M.M. and Ghasemi, A.R.: Determination of Calibration Factors of the Hole Drilling Method for Orthotropic Composites using an Exact Solution. Journal of International Polymer of Science and Technology (In Persian), vol. 19, no. 6, 2007, pp.439-450
[13] Ghasemi, A.R., Behrooz, F.T. and M.M. Shokrieh: Determination of non-uniform residual stresses in laminated composites using integral hole-drilling method: Experimental evaluation. Journal of Composite Materials. vol. 48, no. 4, 2013, pp. 415-425.
[14] Ghasemi, A.R. and M.M. Shokrieh: Residual Strains Measurement and Calculating Residual Stresses in Composite Laminates Using the Integral Method. Journal of Computational Methods in Engineering (In Persian), vol. 28, vo. 2, 2009, pp. 81-93.
[15] Ghasemi, A.R. and M.M. Shokrieh: Development of an Integral Method for Determination of Non-uniform Residual Stresses in Laminated Composites. Journal of Polymer Science and Technology (In Persian), vol. 21, vo. 4, 2007, pp.347-355.
[16] Akbari, S., Behrooz, F.T. and Shokrieh, M.M.: Characterization of residual stresses in a thin-walled filament wound carbon/epoxy ring using incremental hole drilling method. Composites Science and Technology, 2014, vol. 94, pp. 8-15.
[17] Shokrieh, M.M.: Residual stresses in composite materials, First ed., WoodheadPublishing Limited, Cambridge, pp. 76-120, 2014.
[18] Schajer, G.S.: Relaxation methods for measuring residual stresses: techniques and opportunities. Experimental Mechanics, vol. 50, no.8, 2010, pp. 1117–1127.
[19] Schajer, G.S. and Prime, M.B.: Use of inverse solutions for residual stress measurement.  Journal of Engineering Materials and Technology, vol. 128, no. 3, 2006, pp. 375-382.
[20] ANSYS Help System. Analysis Guide and Theory Reference, Ver. 14.5; 2010.
[21] Akbari, S., Behrooz, F.T. and Shokrieh, M.M.: Slitting Measurement of Residual Hoop Stresses Through the Wall-Thickness of a Filament Wound Composite Ring. Experimental Mechanics, vol. 53, 2013, pp. 1509-1518.