Mixed-mode I/II fracture investigation of 3D printed poly ether ether ketone (PEEK)

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2025-01-29 DOI:10.1016/j.tafmec.2025.104854

Gaurav Sharma , Amol Vuppuluri , Anirudh Udupa , Kurra Suresh

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引用次数: 0

Abstract

3D printed PEEK components are now routinely utilized in dental, automotive, and aerospace sectors as PEEK can potentially replace metals. However, a correct evaluation of the fracture behavior and structural integrity especially under mixed-mode loading situations is highly desired to avail the benefits of 3D printed PEEK structures fully. In the present study, the mixed-mode I/II fracture response of additively manufactured PEEK thin sheets is explored using the essential work of fracture (EWF) approach. The length of the actual fracture process zone is incorporated into the mathematical formulation of the EWF approach for the first time to assess the mixed-mode fracture phenomena accurately. The mode-mixity of loading is introduced by varying the orientations of the pre-cracks in 3D printed PEEK specimens. We found that both the essential work of fracture w_e and the plastic dissipation w_p increased monotonically with the pre-crack angle. This indicates that the mixed-mode fracture toughness is substantially greater than the Mode-I toughness. Furthermore, the tendency of the pre-cracks to deviate from the notch-plane was characterized by ex-situ microscopy. The fractured surfaces of 3D-printed cracked specimens are also investigated to recognize the potential mixed-mode failure mechanisms. The observations and analyses presented in this study provide necessary directives for evaluating the strength and longevity of additively manufactured PEEK components.

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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.