Model of fatigue crack propagation rate based on crack tip opening displacement as the driving parameter

Author:

Zhang Yajun12,Dang Hengyao1,Quan Shijun1,Zhang Xinyao1,Chen Qinglei1

Affiliation:

1. Luoyang Ship Material Research Institute, Luoyang, Henan 471023, China

2. Henan Key Laboratory of Technology and Application of Structural Materials for Ships and Marine Equipments, Luoyang 471023, Henan, China

Abstract

To investigate the model of fatigue crack growth rate da/dN based on crack tip opening displacement (CTOD) as the driving parameter, the variation ranges [Formula: see text] by linear elastic fracture mechanics and [Formula: see text] by geometric principle of CTOD were deduced. The fitting relationships of [Formula: see text] and [Formula: see text] were attained through da/dN experiment by taking 17Cr16Ni2 stainless steel, and their discrepancies were compared. The results showed that at the early and middle periods, the relationships of [Formula: see text] and [Formula: see text] could be expressed by Paris law, and da/dN driven by [Formula: see text] was faster than that by [Formula: see text] notably; at the later period, the experimental data of [Formula: see text] and [Formula: see text] deviated from the fitted Paris curves and were above them with being crossed with each other; in the total variation range of CTOD, it was better to fit the relationships of [Formula: see text] and [Formula: see text] by polynomial method rather than Paris law.

Funder

Ministry of Industry and Information Technology

Publisher

World Scientific Pub Co Pte Ltd

Subject

Condensed Matter Physics,Statistical and Nonlinear Physics

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