## Fatigue of engineering plastics |

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Page 77

Note that the stress-flaw size relationship is now defined in terms of a strain

energy release rate 9 instead of the energy ... 30" L1 + sm2 sin y) — cos-^l-sm-

smy , k e 30 . e T- = (2^pcos2cosys,n2' (14) T = T =0 az « v(ay + ax) (

<t2 a ...

Note that the stress-flaw size relationship is now defined in terms of a strain

energy release rate 9 instead of the energy ... 30" L1 + sm2 sin y) — cos-^l-sm-

smy , k e 30 . e T- = (2^pcos2cosys,n2' (14) T = T =0 az « v(ay + ax) (

**plane strain**),<t2 a ...

Page 78

Whether

depends upon the size of the plastic zone relative to the component thickness

and actual crack length. For example,

considered ...

Whether

**plane strain**or plane stress conditions will apply in a given situationdepends upon the size of the plastic zone relative to the component thickness

and actual crack length. For example,

**plane strain**fracture conditions areconsidered ...

Page 79

(3.7) By combining Eqs. (3.3) and (3.7), it is seen that 'SE = K2 (plane stress) and

^£ (1 — v2)1/2 — K2 (

established on a more rigorous basis by Bueckner [17]. Equation (3.8) represents

the ...

(3.7) By combining Eqs. (3.3) and (3.7), it is seen that 'SE = K2 (plane stress) and

^£ (1 — v2)1/2 — K2 (

**plane strain**), representing relationships that wereestablished on a more rigorous basis by Bueckner [17]. Equation (3.8) represents

the ...

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### Contents

Fatigue Crack Propagation | 74 |

Fatigue Fracture Micromechanisms in Engineering Plastics | 146 |

Composite Systems | 184 |

Copyright | |

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### Common terms and phrases

adhesive amplitude ASTM ASTM STP Beardmore Bucknall carbon cfrp component Composite Materials composites constant crack growth rates crack length crack tip craze crystalline cyclic loading da/dN decrease deformation discontinuous growth bands discussed ductile 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 laminates loading cycles M. D. Skibo material matrix mean stress 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 shown in Fig specimen spherulite static stress intensity factor stress level striation studies temperature rise tensile test frequency thermal failure tion toughening unnotched values viscoelastic yield strength