A new constant life diagram model for the longitudinal fatigue of unidirectional composites
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DOI 10.1007/s12206-020-0712-4
Journal of Mechanical Science and Technology 34 (8) 2020 Original Article DOI 10.1007/s12206-020-0712-4 Keywords: · Constant life diagram · Longitudinal fatigue · Mean stress effect · S-N curve · Unidirectional composites
Correspondence to: Yuanchen Huang [email protected]
Citation: Huang, Y., Ha, S. K. (2020). A new constant life diagram model for the longitudinal fatigue of unidirectional composites. Journal of Mechanical Science and Technology 34 (8) (2020) ?~?. http://doi.org/10.1007/s12206-020-0712-4
Received November 20th, 2019 Revised
May 25th, 2020
Accepted June 1st, 2020 † Recommended by Editor Chongdu Cho
A new constant life diagram model for the longitudinal fatigue of unidirectional composites Yuanchen Huang1 and Sung Kyu Ha2 1
Department of Mechanical Engineering, University of Shanghai for Science and Technology, 516 Jun2 gong Road, Shanghai 200093, China, Department of Mechanical Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Korea
Abstract A new constant life diagram (CLD) model featuring asymmetric bilinear constantlife curves was proposed to better describe the longitudinal fatigue behavior of unidirectional laminae (UD) under a wide range of stress ratios. This model is able to predict S-N curves with satisfactory accuracy not only in tension-tension (T-T) fatigue mode but also in tensioncompression (T-C) and compression-compression (C-C) modes, whereas the conventional Goodman CLD model shows inferior performance especially in T-C and C-C modes. Apart from static tension and compression tests, high- and low-cycle fatigue tests at two stress ratios corresponding to T-T and C-C modes should be performed to determine the parameters in the proposed model. Fatigue test data of several different GFRP UDs at various stress ratios were utilized to validate the proposed model, and the S-N curves predicted by the proposed model agreed well with the experimental results. Compared with the Goodman CLD model, the proposed CLD model demonstrates an enhanced predictive capability without losing its simplicity. 1. Introduction
© The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2020
With the increasingly extensive application of continuous fiber-reinforced composites in major load-bearing components in large structures such as the fuselage and wing box of intercontinental airliners, the blades of megawatt wind turbines, and the risers in deepwater oil platforms, the durability of these composites against fatigue loading has received much attention from both the industry and academia. Given that the longitudinal direction of unidirectional laminae (UD) is the main load-carrying direction, understanding longitudinal fatigue behavior is the most important step in establishing a fatigue life prediction methodology that is universally applicable to multidirectional laminates and other composites with various fiber architectures. Furthermore, the UD longitudinal response under tension-co
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