Page 142 - Fiber Fracture

Fiber Fracture
M . Elices and J . Llorca (Editors)
0 2002 Elsevier Science Ltd . All rights reserved

STRENGTH OF GLASS FIBERS

Prabhat K . Gupta

Department of Materials Science and Engineering . The Ohio State University. 2041 College Road .
Columbus. OIf 43210. USA

Introduction ..................................... 129
Basic Concepts ................................... 131
Flaws and Cracks ................................ 131
Pristine and Non-Pristine Fibers ........................ 131
Statistics of Measured Strengths ........................ 131
Intrinsic Strength. S* .............................. 132
Extrinsic Strength. S .............................. 133
Inert Strength. SO ................................ 133
Theoretical Strength. S* ............................ 133

Diameter and Length Dependence of Inert. Extrinsic Strength. So (d. L) ... 134
Fatigue Strength. S(E[. X. T) .......................... 134
Delayed Failure (Static Fatigue) ........................ 135
Slow Crack Growth Model of Extrinsic Fatigue ................ 135
The Inert Strength ............................ 136
The Time to Failure. t(T. X. s) ...................... 136
The Strain Ratc Dependence of Strength ................ 136
The Temperature Dependence of Strength ................ 136
The Humidity Dependence of Strength ................. 137
Extrinsic Strength of Glass Fibers - Experimental Results ............ 137
Extrinsic Inert Strength ............................. 139
Inert Strength Distributions ....................... 139
Fractography of Low-Strength Breaks .................. 139
Extrinsic Fatigue Strength ........................... 141
Intrinsic Strength of Glass Fibers - Experimental Results ............ 143
Room Temperature Intrinsic Strength. S*(RT) ................. 143
E-glass Fibers .............................. 143
Silica Fibers ............................... 144
S-glass Fibers .............................. 145
Liquid Nitrogen Temperature Intrinsic Strength. S,* .............. 146
E-glass Fibers .............................. 146
Silica Fibers ............................... 146