Abstract
A new constant life diagram (CLD) model featuring asymmetric bilinear constant-life 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.
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Abbreviations
- σ meam :
-
Mean stress
- σ amp :
-
Stress amplitude
- R :
-
Stress ratio
- N f :
-
Number of cycles to failure
- X :
-
Ply longitudinal tensile strength
- X′ :
-
Ply longitudinal compressive strength
- σ eff :
-
Stress-ratio-independent effective stress corresponding to the given number of cycles to failure
- b, n, μ, β0 :
-
Shape parameters of the new constant life diagram
- s1,s2 :
-
Slopes of the right half and left half segments of the bilinear constant life curve
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Yuanchen Huang is a lecturer at the Department of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai, China. He received his B.Eng. from Shanghai Jiao Tong University, China and his M.S. and Ph.D. in Mechanical Engineering from Hanyang University, Korea. His research interests include micromechanics, multi-scale modeling of composite materials, and strength and fatigue life prediction of composite structures.
Sung Kyu Ha is a Professor at the Division of Mechanical Engineering, College of Engineering, Hanyang University, Seoul, Korea. He received his B.Eng. from Hanyang University, Korea and his M.S. and Ph.D. in Mechanical Engineering from Stanford University. His research interests include integrated engineering development process for highly competitive composites, innovative additive manufacturing of composites, integrated design optimization of wind turbine blades, design of flywheel energy storage systems, multi-scale fatigue life prediction of composites, and structural health monitoring.
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Huang, Y., Ha, S.K. A new constant life diagram model for the longitudinal fatigue of unidirectional composites. J Mech Sci Technol 34, 3207–3216 (2020). https://doi.org/10.1007/s12206-020-0712-4
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DOI: https://doi.org/10.1007/s12206-020-0712-4