Formulation of Long-term Creep and Fatigue Strengths of Polymer Composites Based on Accelerated Testing Methodology

Miyano, Yasushi; Nakada, Masayuki; Cai, Hongneng

doi:10.1177/0021998308093913

Cited by 91 publications

(69 citation statements)

References 25 publications

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“…The details for test methods and tests results shown here were published in our previous paper. 6 Therefore, the explanation presented here addresses the formulations of ATM-2 using the measured data.…”

Section: Specimens and Test Methodsmentioning

confidence: 99%

“…[1][2][3][4][5] Furthermore, we have proposed a method of formulating master curves based on the simple equation as functions of time to failure, temperature, loading frequency, and number of cycles to failure. 6 However, this equation has not directly taken into account the viscoelastic coefficients of matrix resin. Therefore, the equation cannot be applied to the life Materials System Research Laboratory, Kanazawa Institute of Technology, Japan prediction of CFRP laminates exposed to an actual load and temperature history.…”

Section: Introductionmentioning

confidence: 99%

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Advanced accelerated testing methodology for long-term life prediction of CFRP laminates

Nakada

Miyano

2013

Journal of Composite Materials

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An advanced accelerated testing methodology (ATM-2) for long-term life prediction of CFRP laminates exposed to actual loading with a general stress and temperature history is proposed based on the conventional accelerated testing methodology (ATM-1) established for the long-term life prediction of CFRP laminates exposed to stress and temperature. The most important condition for ATM-1 is that the time-temperature superposition principle held for the viscoelastic behavior of matrix resin holds also for the static, creep, and fatigue strengths of CFRP laminates. Furthermore, three conditions that form the basis of ATM-2 are introduced along with their scientific bases. The long-term fatigue strength of CFRP laminates under an actual loading is formulated based on the three conditions. The viscoelastic coefficients of matrix resin, which perform an important role for the time and temperature dependence of long-term life of CFRP laminates, are also formulated based on the time-temperature superposition principle. The applicability of ATM-2 is demonstrated by predicting the long-term fatigue strengths of four typical directions of unidirectional CFRP laminates.

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Section: Specimens and Test Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Advanced accelerated testing methodology for long-term life prediction of CFRP laminates

Nakada

Miyano

2013

Journal of Composite Materials

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“…A master curve of these measured storage moduli can be formed by shifting the data in the time axis. Miyano from Kanazawa Institute of Technology in Japan has pioneered this approach for many years [13] . Figure 12 shows the storage modulus master curve of Hexcel 8552 matrix system, baseline for MMF.…”

Section: Master Curves From Accelerated Testing Methods (Atm)mentioning

confidence: 99%

A damage prediction of high temperature polymer matrix composites

Cimini

2011

Science and Engineering of Composite Materials

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This work for prediction of damage and life is based on a new micromechanics of failure theory (MMF) and was started a few years ago. Instead of using the unidirectional ply as the building block, it was found that starting with the fi ber, matrix and their interface would lead to a much simpler theory. The constituent properties will include two tensile and compressive strengths of matrix and fi ber, plus normal and shear strengths covering the interface. The measured storage modulus of the viscoelastic matrix can be linked to the stiffness and strengths of plies and laminates from which creep rupture and fatigue strengths can be derived. One advantage of this approach is that the failure process of plies and laminates can be explicitly defi ned in terms of fi ber, matrix and interfacial failures. No empirical factor is needed. The effect of moderately high temperature is fully integrated in the basic viscoelastic formulation, not accounted for by a knockdown factor. In addition, macro level properties of idealized square, hexagonal and random fi ber arrays can be modeled and the resulting medium and scatter of predicted stiffness and strength are in reasonable agreement with available data. This modeling process is generic and can be applied to different material systems at room and elevated temperatures. Examples of metal matrix composites and hybrid composites like Tigr and Glare can be systematically described with no additional constants except the six basic strengths (four for fi ber and matrix and two for the interface). First and last ply failures of laminates (FPF and LPF) can be similarly described with explicit defi nition of the failure modes. The failure process of matrix does not necessarily defi ne the ultimate strengths of plies and laminates. Sophisticated modeling of the local degradation of matrix by micro cracking, ply delamination and fi ber micro buckling will be explored with appropriate software packages developed for use by design engineers. In the mean time master curves covering the constituent stiffness and strength as functions of time and temperatures will be developed, measured and analyzed. In the end, failure envelopes of composite laminates in creep rupture and fatigue strength will be illustrated and their use for design be explained. In particular, the failure and life of a composite wind turbine blade is a good test of the predictive power of MMF.

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“…It is worth noting that fatigue models by Miyano et al [9,10,11] and Reifsnider et al [12] are meant to account for viscoelastic effects while the model by Epaarachchi and Clausen [13] includes the effect of frequency under the assumption of negligible hysteretic heating. However, Guedes [24] has suggested that the linear cumulative law employed by Myiano may not fare well for complex fatigue loads or long lifetimes.…”

Section: Introductionmentioning

confidence: 99%

Modelling the effect of temperature on the probabilistic stress–life fatigue diagram of glass fibre–polymer composites loaded in tension along the fibre direction

Cormier

Joncas

2017

Journal of Composite Materials

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Predicting the fatigue performance of composites has proven to be a challenge both conceptually, due to the inherent complexity of the phenomenon, and practically, because of the resource-intensive process of fatigue testing. Moreover, mechanical behaviour of polymer matrix composites exhibits a complicated temperature dependence, making the prediction of fatigue performance under different temperatures even more complex and resource intensive. The objective of this paper is to provide a method for the prediction of fatigue life of glass-polymer composites loaded in the fibre direction at various temperatures with minimal experimental efforts. This is achieved by using a static strength degradation approach to fatigue modelling, where only two parameters (including static strength) are temperature dependent, in conjunction with relationships for these two fatigue model parameters temperature dependence. The method relies on fatigue data at a single temperature and simple static tests at different temperatures to predict the effects of temperature on the material's fatigue behaviour. The model is validated on experimental data for two unidirectional (UD) and one woven glass-epoxy composites and is found to accurately predict the effect of temperature on fatigue life of composites. A method to obtain probabilistic stress-life (P − S − N) fatigue diagrams including temperature effects is also discussed. 1

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Formulation of Long-term Creep and Fatigue Strengths of Polymer Composites Based on Accelerated Testing Methodology

Cited by 91 publications

References 25 publications

Advanced accelerated testing methodology for long-term life prediction of CFRP laminates

Advanced accelerated testing methodology for long-term life prediction of CFRP laminates

A damage prediction of high temperature polymer matrix composites

Modelling the effect of temperature on the probabilistic stress–life fatigue diagram of glass fibre–polymer composites loaded in tension along the fibre direction

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