عنوان مقاله [English]
نویسندگان [English]چکیده [English]
In this research, delamination in an asymmetric double cantilever beam (ADCB) has been studied. The ADCB specimen is one the most proper samples for testing and calculating the mixed mode I/II fracture. First, a semi-empirical relation for calculating the total strain energy release rate (SERR) and the values of mode I and II of this parameter has been extended. Moreover, the total SERR of a laminated composite is determined using the virtual crack closure technique (VCCT). Furthermore, by the use of this method fracture toughness of ADCB specimen and its modes can be calculated by testing of a unidirectional DCB specimen. Therefore, testing of ADCB samples is not required. Also, for verifying results obtained by the semi-empirical relation of the total SERR, experimental, analytical and numerical methods are used. By modeling of the mentioned specimen in ABAQUS/Standard, values of mode I and II SERR are calculated. This method can be used for assessment of the semi-empirical relation. Finally, it was observed that results of the semi-empirical relation are in very good agreements with the experimental, analytical and numerical results. This method reduces the volume of calculations of numerical methods and costs of experimental tests significantly.
 Bradley W.L, Cohen R.N, (1985), "Matrix deformation and fracture in graphite-reinforced epoxies, Delamination and Debonding of Materials", American Society for Testing and Materials, Philadelphia, ASTM STP 876, 389-410.
 Davies P, Blackman B.R.K, Brunner A.J, (1998), "Standard test methods for delamination resistance of composite materials: current status". Appl Compos Mater, 5(6), 345–64.
 Xiao F., Hui C.-Y, Kramer E.J, (1993), "Analysis of a mixed mode fracture specimen: the asymmetric double cantilever beam", Journal of Materials Science, 28, 5620-562.
 ASTM D5528, (2007), "Standard test method for mode I interlaminar fracture toughness of unidirectional fiber-reinforced polymer matrix composites". Annual book of ASTM standards,15,1-12.
 Sriharan.S, (2008), "Delamination Behavior of composite" ,Published by Woodhead Publishing and Maney Publishing on behalf of The Institute of materials, Mainerals & Mining, CRC Press Boca Raton Boston New York Washington.
 Sheinman I, Kardomateas G.A, (1997), "Energy release rate and stress intensity factors for delaminated composite laminates". Int J Solids Struct, 34(4), 451–9.
 Sela N, Ishai O, (1989), "Interlaminar fracture toughness and toughening of laminated composite materials", a review.Composites, 20(5), 416.
 Barrett J.D, Foschi R.O, (1977), "Mode II stress intensity factors for cracked wood beams", Engng Fract Mech, 9(3), 371–8.
 O’Brien T.K, (1982), "Characterization of delamination onset and growth in a composite laminate" .In: Reifsnider KL, editor. Damage in composite materials. American Society for Testing and Materials, ASTM STP 775, 140–67.
 Williams J.G, (1988), "On the calculation of energy release rates for cracked laminates", International Journal of Fracture, 36(2), 101–119.
 Creton C, Kramer E.J, Hui C.Y, Brown H.R, (1992), "Failure mechanisms of polymer interfaces reinforced with block copolymers", Macromolecules, 25, 3075–3088.
 Kanninen M.R, (1974), "A dynamic anaiysis of unstable crack propagation and arrest in the DCB test specimen", International Journal of Fracture, 10(3), 415-430.
 Kanninen M.F, (1973), "An augmented double cantilever beam model for studying crack propagation and arrest", Int. J. Fracture, 9(1), pp-83-92.
 Kondo K, (1995), "Analysis of double cantilever beam specimen", Adv. Composite Materials, 4(4), 355-366.
 Ozdil F, Carlsson L. A, (1999), "Beam analysis of angle-ply laminate DCB specimens", 0, 59, 305-315.
 Williams J.G, (1989(, "End Corrections for Orthotropic DCB Specimens", Composite Science and Technology, 35, 367-376.
 Whitney J.M, (1985), "Stress Analysis of the Double Cantilever Beam Specimen", Composite Science and Technology, 23, 201-219.
 Olsson R.A, (1992),"A simplified improved beam analysis of the DCB specimen", Composite Science and Technology, 43, 329-338.
 Shokrieh M.M, Heidari Rarani M, Ayatollahi M.R, (2011), "Calculation of GI for a multidirectional composite double cantilever beam on two-parametric elastic foundation", Aerosp Sci Technol, 15, 534-543.
 Gdoutos E.E, Pilakoutas K. Chris A. Rodopoulos, (2000), "Failure Analysis of Industrial Composite Materials", McGraw-Hill Professional, 553 pages.
 Krueger R, (2002), "The Virtual Crack Closure Technique: History, Approach and Applications", NASA/CR-211628.
 Shivakumar K.N, Tan P. W, Newman J. C, (1988), "A Virtual Crack Closure Technique for Calculating Stress Intensity Factors for Cracked Three-Dimensional Bodies", Int. J. Fract. 36, 43-50.
 Ducept F, Gamby D, Davies P, (1999), "A mixed-mode failure criterion derived from tests on symmetric and asymmetric specimens", 59, 609-619.