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A New Approach to Evaluate the Delayed Fracture Behavior of an Optical Glass Fiber

Published online by Cambridge University Press:  26 February 2011

M. Muraoka  and
H. AbÉ
M. Muraoka
Affiliation:
Tohoku University, Dept. of Mechanical Engineering, Sendai 980, Japan
H. AbÉ
Affiliation:
Tohoku University, Dept. of Mechanical Engineering, Sendai 980, Japan
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Abstract

The method for the direct measurement of subcritical crack growth in silica optical fiber with 125μm in diameter was developed. The obtained crack velocity da/dt as a function of stress intensity factor KI was expressed by means of log da/dt vs log KI linear relation with slope n. The obtained value of n showed 22.6 (25 °C,60%r.h.) with small standard deviation 0.7. These results indicate that the postulated crack growth law used for the lifetime prediction is valid and the present approach can solve the problem in the conventional method for evaluating the value of n where the evaluated value has been widely scattered.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 226: Symposium H – Mechanical Behavior of Materials and Structures in Microelectronics , 1991 , 369
Copyright
Copyright © Materials Research Society 1991

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