The concept of electrospun polymer nanofiber fabric interleaving to enhance dynamic properties, impact damage resistance, fracture toughness and resistance, and delamination onset life was evaluated. Polymer nanofabric interleaving increased the laminate thickness and weight by an order of 1%, and its impact on in-plane mechanical properties of the composite laminate would be statistically zero. On the other hand, its influence on interlaminar fracture toughness and resistance, impact damage resistance, and damping is substantial. Results of this study showed that interleaving AS4/3501-6 composite laminate increased the damping by 13%, reduced the impact damage size to one-third, increased fracture toughness and resistance by 1.5 times and one-third, respectively, significantly increased delamination onset life, and increased the fatigue threshold energy release rate by two-thirds. These improvements are comparable to that of the commercial T800H/3900-2 composite but with no thickness increase penalty, loss of in-plane properties, or multiple glass transition temperatures. Nomenclature A = cross-sectional area of cantilever beam, m 2 a IC = initial delamination length for the fracture test at = acceleration at any time t a 0 = initial delamination length da = delamination extension E 0 = material storage modulus, Pa E 00 = material loss modulus, Pa Et = instantaneous energy at any time t G I = mode I energy release rate G IC = initiation mode I fracture toughness G I max = maximum cyclic mode I energy release rate G IR = plateaued mode I fracture resistance G R = fracture resistance g = acceleration due to gravity, 9:81 m=s 2 L = length of the cantilever beam M = effective mass of the impactor system M a = mass of the impactor and the accelerometer system N 1% = number of cycles for 1% compliance increase Pt = instantaneous impact force, N R = ratio of minimum and maximum cyclic displacement I min = I max T g = glass transition temperature t = time, s tan = damping factor V 0 = initial velocity of the impactor at the time of impact = delamination length correction parameter IC = critical load-point displacement when the delamination starts to grow in the fracture test I max = maximum value of cyclic displacement I min = minimum value of cyclic displacement = mass density of the cantilever beam
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