Fatigue of Engineering Plastics |
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Page 86
... elastic stress intensity range , and I ( t ) / I ( o ) the normalized creep compliance of the material . For an ideal elastic solid , I ( t ) / I ( 0 ) = 1 and AKeff AKelas For times greater than zero , the value of I ( t ) is ...
... elastic stress intensity range , and I ( t ) / I ( o ) the normalized creep compliance of the material . For an ideal elastic solid , I ( t ) / I ( 0 ) = 1 and AKeff AKelas For times greater than zero , the value of I ( t ) is ...
Page 96
... elastic moduli , the latter resulting in larger cyclic strains per unit stress intensity level . This situation was aggravated by hysteretic heating - induced further reductions in these two properties . For example , a pure HI - N66 ...
... elastic moduli , the latter resulting in larger cyclic strains per unit stress intensity level . This situation was aggravated by hysteretic heating - induced further reductions in these two properties . For example , a pure HI - N66 ...
Page 135
... elastic moduli of PMMA and PC as determined from a tensile test are not too dis- similar and yet the FCP rates of these two materials differ by approximately three orders of magnitude . It is interesting to note , though , that on a AK ...
... elastic moduli of PMMA and PC as determined from a tensile test are not too dis- similar and yet the FCP rates of these two materials differ by approximately three orders of magnitude . It is interesting to note , though , that on a AK ...
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adhesive ASTM ASTM STP Bucknall carbon cfrp component composites constant crack growth rate crack length crack tip craze crystalline cyclic loading da/dN decrease deformation discontinuous growth bands discussed ductile dynamic mechanical effect elastic elastic modulus energy epoxy fatigue behavior fatigue crack growth fatigue crack propagation fatigue failure fatigue fracture fatigue tests FCP behavior FCP rates fibers fracture mechanics fracture surface fracture toughness frequency sensitivity hysteresis hysteretic heating increase J. A. Manson Kambour loading cycles M. D. Skibo material matrix mean stress mm/cycle modulus molecular weight notched nylon 66 plastic zone PMMA polyacetal polycarbonate polymeric solids polystyrene properties PVDF R. W. Hertzberg Rabinowitz rubber S-N curve samples Section semicrystalline shear shown in Fig specimen spherulite static strain stress intensity factor stress level striations studies temperature rise tensile test frequency thermal failure tion toughening unnotched values viscoelastic yield strength ΔΚ