Effect of debond growth on stress-intensity factors in a cracked orthotropic sheet stiffened by a semi-infinite orthotropic sheet
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adhe adhesive failure adhesive layer adhesive shear stresses adhesive stress-strain curve adhesive stresses adhesively bonded applied stress levels assumed beneath the stringer body force causes the stress-intensity composite materials configuration crack length crack-face pressure crack-tip stress-intensity factor cracked orthotropic sheet debond growth debond initiates Edge of stringer effect of adhesive elliptic debond factors to increase figures 14 Green's functions h3dy hesive including debonding infinite sheet integral equations intensity factor kernels Sjk Langley Research Center level of applied linear adhesive linear elastic adhesive material properties model the adhesive nonlinear adhesive nonlinear elastic adhesive Normalized stress-intensity factor piecewise linear approximation plane stress Poisson's ratios predicted debond area pressure gq problem rectangular debond right crack tip rupture strength shear modulus Shear strain sheet layer shown in figure shows the predicted solution stress level required stress-intensity fac Stringer Debond stringer edge stringer is modeled stringer layer thickness tip is beneath unstiffened sheet