Fatigue of Engineering Plastics |
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Page 81
... da / dN increases with increasing stress level such that da / dNx f ( o , a ) . ( 3.9 ) Numerous relationships have been proposed to describe the FCP behavior of metallic and polymeric solids , based on empirical formulations and ...
... da / dN increases with increasing stress level such that da / dNx f ( o , a ) . ( 3.9 ) Numerous relationships have been proposed to describe the FCP behavior of metallic and polymeric solids , based on empirical formulations and ...
Page 107
... da / dN = ẞX " , ( 3.15 ) where ẞ is a function of loading frequency , material properties , and environ- ment , n a constant , and λ = Kax - Kin . Since & is also equal to the quantity 2AK Kmean , Eq . ( 3.15 ) bears a strong ...
... da / dN = ẞX " , ( 3.15 ) where ẞ is a function of loading frequency , material properties , and environ- ment , n a constant , and λ = Kax - Kin . Since & is also equal to the quantity 2AK Kmean , Eq . ( 3.15 ) bears a strong ...
Page 108
... da / dN values increased by about two- to threefold at a given AK level when the load ratio R increased from 0 to 0.6 . ( Similarly , Sauer et al . [ 106 ] found that the unnotched fatigue life of PS samples decreased at a fixed stress ...
... da / dN values increased by about two- to threefold at a given AK level when the load ratio R increased from 0 to 0.6 . ( Similarly , Sauer et al . [ 106 ] found that the unnotched fatigue life of PS samples decreased at a fixed stress ...
Contents
Fatigue Crack Propagation | 74 |
Fatigue Fracture Micromechanisms in Engineering Plastics | 146 |
Composite Systems | 184 |
Copyright | |
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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 flaw fracture mechanics fracture surface fracture toughness frequency sensitivity hysteresis hysteretic heating increase J. A. Manson Kambour Kmax laminates 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 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