Statistical life prediction of a unidirectional carbon fiber/polypropylene laminates under creep bending load

Nakada, Masayuki; Miyano, Yasushi; Morisawa, Yoko; Nonaka, Taiga; Isaki, Takeharu; Hirano, Taiki; Uzawa, Kiyoshi

doi:10.1177/07316844211073596

Cited by 1 publication

(3 citation statements)

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“…The storage moduli E 0 (f, T) were converted to the relaxation moduli E r (t, T) using equation (10). The details have been described inRef [30,31] and then the results are shown in this paper. The left part of Figure 2 is the relaxation moduli for PP measured at various temperatures, and the right part of this figure is the master curve of the relaxation modulus for PP, which was obtained by shifting measured data at various temperatures along the log scale of time and the log scale of the relaxation modulus until they mutually overlapped based on the time-temperature superposition principle.…”

Section: Relaxation Modulus Of Matrix Resinmentioning

confidence: 99%

“…These results were referred from a report of an earlier study. 30,31 The relation between static strength of CF/PP laminates and viscoelastic modulus of the matrix resin PP can be explain the failure mechanism of unidirectional fiber reinforced composites. The failure mechanism under tensile load is the cumulative fiber breakage.…”

Section: Statistical Tensile and Flexural Static Strengths Of Cf/ Pp ...mentioning

confidence: 99%

“…However, the flexural creep strength decreases drastically with increasing time. 30,31 As described herein, the ATM is applied to the prediction of fatigue strength for CF/PP laminates under tensile and flexural loads. The statistical time-dependent and temperature-dependent static and fatigue strengths of CF/PP laminates under tensile and flexural loads are measured under several temperatures and frequencies, and the fatigue life under tensile and flexural loads are predicted using measured data.…”

Section: Introductionmentioning

confidence: 99%

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Statistical tensile and flexural fatigue lives of unidirectional CF/PP laminates

Nakada

Miyano

Nonaka

et al. 2023

Journal of Reinforced Plastics and Composites

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The accelerated testing methodology (ATM) for the statistical life prediction of carbon fiber reinforced plastics (CFRP) under creep and fatigue loads based on the viscoelasticity of matrix resin has been proposed by authors. This method has been successfully applied to the life predictions of unidirectional CFRP with thermosetting epoxy resin as the matrix under tensile and flexural loads. In this paper, this method was applied to the fatigue life prediction of unidirectional CFRP (CF/PP laminates) with thermoplastic polypropylene (PP) as the matrix under tensile and flexural loads, and the effect of matrix viscoelasticity and load cycles on the fatigue behavior of CF/PP laminates were discussed under tensile and flexural loads. First, the viscoelasticity of matrix PP was measured. Second, the static and fatigue strengths of CF/PP laminates were statistically measured at various temperatures and frequencies under tensile and flexural loads. Third, all of material parameters in the fatigue strength formulation in ATM were determined using measured data, and the statistical long-term fatigue strengths of CF/PP laminates were predicted under tensile and flexural loads. As results, comparison with tension and bending test results clarified that the long-term tensile fatigue strength of CF/PP laminates decreases at an accelerated rate as the number of cycles increases, and that the flexural fatigue strength is affected by temperature and frequency rather than by the number of cycles to failure.

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Section: Relaxation Modulus Of Matrix Resinmentioning

confidence: 99%

Section: Statistical Tensile and Flexural Static Strengths Of Cf/ Pp ...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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