Investigating the mixed-mode creep crack growth behavior of GH4169 superalloy: Experimental and numerical approaches

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2025-01-23 DOI:10.1016/j.tafmec.2025.104852

Xin Huang , Hongyu Qi , Shaolin Li , Qikun Xie , Xiaoguang Yang , Duoqi Shi

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引用次数: 0

Abstract

Time-dependent fracture mechanics primarily addresses creep crack growth (CCG) in creep-ductile materials. However, certain superalloys exhibit creep-brittle behavior, where CCG rates are governed by K. In this study, the mode I and I/II mixed mode CCG behavior of the superalloy GH4169 at 550 °C were investigated using experimental and numerical methods. Scanning electron microscope observations showed that intergranular fracture dominated the initial and stable crack growth stages. Finite element analysis indicated that the crack tip remained small scale creep and predominantly exhibited mode I behavior once crack growth initiated. For various loading angles, the da/dt-K_I curves aligned along a single line. The crack growth angle, predicted by MTS theory, showed good agreement with experimental results. Additionally, FRANC3D software was used to simulate the CCG behavior.

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来源期刊

Theoretical and Applied Fracture Mechanics 工程技术-工程：机械

CiteScore

8.40

自引率

18.90%

发文量

435

审稿时长

37 days

期刊介绍： Theoretical and Applied Fracture Mechanics'' aims & scopes have been re-designed to cover both the theoretical, applied, and numerical aspects associated with those cracking related phenomena taking place, at a micro-, meso-, and macroscopic level, in materials/components/structures of any kind. The journal aims to cover the cracking/mechanical behaviour of materials/components/structures in those situations involving both time-independent and time-dependent system of external forces/moments (such as, for instance, quasi-static, impulsive, impact, blasting, creep, contact, and fatigue loading). Since, under the above circumstances, the mechanical behaviour of cracked materials/components/structures is also affected by the environmental conditions, the journal would consider also those theoretical/experimental research works investigating the effect of external variables such as, for instance, the effect of corrosive environments as well as of high/low-temperature.