ESTIMATION METHOD OF CREEP CRACK INITIATION AND THE EFFECT OF NOTCH SHAPE AND SPECIMEN WIDTH OF CREEP CRACK INITIATION AND PROPAGATION.

Tosimitsu Yokobori, Takashi Kuriyama, Takeo Yokobori, Takuzou Kako

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

In this paper, the authors show that creep crack propagation life is controlled by the size of the micro cracking region formed before crack initiation. Since, for a circular notch the stress concentration factor is small compared with that for a V type sharp notch, the size of the micro cracking region is much larger than that for a V type sharp notch. So the creep crack propagation life becomes very short. These micro cracking regions are formed due to concentrated plastic deformation. But the relative notch opening displacement RNOD//c equals DELTA phi //i/ phi //0( DELTA phi //i equals phi //i minus phi //0, phi //i is the notch opening displacement at the crack initiation, phi //0: Initial notch opening displacement) is the best accurate parameter of crack initiation, independent of such different creep crack propagation characteristics.

Original languageEnglish
Pages (from-to)1221-1227
Number of pages7
JournalNippon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume52
Issue number477
Publication statusPublished - 1986 May
Externally publishedYes

ASJC Scopus subject areas

  • Mechanical Engineering

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