Creep rupture of polymer-matrix composites

Brinson, H. F.; Griffith, W. I.; Morris, D. H.

doi:10.1007/bf02326232

Cited by 16 publications

(12 citation statements)

References 14 publications

(20 reference statements)

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“…Similar to the procedure for glass/iPP, a double logarithmic plot of the minimum creep rate versus the corresponding time-to-failure is constructed; represented in Figure 15. The data shows a clear trend with a slope of À1 and is well described by equation (5), yielding the value of the critical strain e cr listed in Table 6.…”

Section: Carbon/peekmentioning

confidence: 67%

“…Consequently, lifetime prediction methods can be used that are based on time-temperature superposition, time-stress superposition, and rate theory, where temperature and/or stress are used to accelerate the failure. [3][4][5] In long-term cyclic loading, the estimation of the lifetime of composite laminates is a little more challenging. Lifetime predictions are commonly based on S-N curves of UD-laminates in several loading angles, which serve as an input to predict multiaxial fatigue failure, as proposed by Hashin and Rotem.…”

Section: Introductionmentioning

confidence: 99%

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Identification of plasticity-controlled creep and fatigue failure mechanisms in transversely loaded unidirectional thermoplastic composites

Erartsın

Drongelen

Govaert

2020

Journal of Composite Materials

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In continuous fiber-reinforced thermoplastics, the macroscopic failure mode in transverse long-term failure is dominated by a brittle crack-growth mechanism. Neat thermoplastic matrices, on the other hand, generally display also a plasticity-controlled mechanism in long-term loading at elevated stress levels and/or temperature. This failure mechanism requires a different approach to lifetime prediction than crack growth; hence, it is important to identify it in the long-term performance of composites. In this study, we demonstrate the presence of the plasticity-controlled failure mechanism in long-term failure of transversely loaded unidirectional (UD) thermoplastic composites made of glass/iPP, carbon/PEEK and carbon/PEKK. The main method used is to compare the lifetime in cyclic loading to that in static loading at the same level of maximum stress, where an increase in lifetime is characteristic for plasticity controlled failure, and, vice versa, a decrease is indicative for fatigue crack growth. In addition, the applicability of a lifetime prediction method common to plasticity-controlled failure of neat thermoplastics is evaluated for the composites investigated. The results of this study indicate that the plasticity-controlled failure was present in composites, although the extent to which the effects are present varied depending on the materials investigated. Glass/iPP showed the most explicit evidence of the plasticity-controlled failure over the entire load range experimentally covered. Its long-term failure was delayed with a decrease in the stress ratio and lifetime was predicted well using the principles of plasticity-controlled failure.

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Section: Carbon/peekmentioning

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Identification of plasticity-controlled creep and fatigue failure mechanisms in transversely loaded unidirectional thermoplastic composites

Erartsın

Drongelen

Govaert

2020

Journal of Composite Materials

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“…Zhurkov's equation (1) can be used at relatively high loads (short failure times) to obtain failure times at loads at any temperature of interest. By taking a few data points at one or two other temperatures the spectrum of failure times can be expanded to temperatures not easily accessible.…”

Section: Discussionmentioning

confidence: 99%

“…Again the utility of Zhurkov's equation (1) is apparent. The use of equation (2) is enhanced since data at only one other temperature is required for predictions [4] at any other desired temperature.…”

Section: Dynamic Tensionmentioning

confidence: 96%

“…A review of the literature shows a paucity of work on accelerated testing in general and particularly for composites. Brinson and his coworkers [1] have tried the time temperature superposition method and Chiao [2] has used the creep rupture method of Zhurkov [3]. Both methods were developed prior to the advent of composite materials and have shown only modest success when applied to composites.…”

Section: Introductionmentioning

confidence: 98%

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Accelerated Testing of Composites

Papazian¹

1983

Journal of Reinforced Plastics and Composites

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Time‐dependent failure of off‐axis loaded unidirectional glass/iPP composites

Erartsın

Amiri-Rad

Drongelen

et al. 2022

J of Applied Polymer Sci

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In our previous study, we demonstrated that the time‐dependent failure of transversely loaded UD (unidirectional) glass/iPP is fully plasticity‐controlled and proposed a lifetime prediction method based on plasticity to predict transverse failure. In the present work, extending our previous study to other off‐axis angles, we aim to investigate the effect of the off‐axis angle on the time‐dependent failure of UD glass/iPP, and to propose a lifetime prediction method for the off‐axis failure. Glass/iPP specimens with different off‐axis angles are tested at various strain rates, creep, and fatigue loads to characterize the anisotropic, time‐dependent mechanical response. It is demonstrated that the influences of strain rate and fiber orientation angle on tensile strength are multiplicatively separable; also referred to as factorizable, enabling one to characterize the angle dependence at a single strain rate and the strain rate dependence at a single angle. Moreover, similar to transverse loading, off‐axis failure is also observed to be plasticity‐controlled. Based on these observations, the lifetime prediction method for the plasticity‐controlled transverse failure is extended to off‐axis loading using the aforementioned factorazibility, which resulted in lifetime predictions in agreement with the experimental creep and fatigue data.

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Creep rupture of polymer-matrix composites

Cited by 16 publications

References 14 publications

Identification of plasticity-controlled creep and fatigue failure mechanisms in transversely loaded unidirectional thermoplastic composites

Identification of plasticity-controlled creep and fatigue failure mechanisms in transversely loaded unidirectional thermoplastic composites

Accelerated Testing of Composites

Time‐dependent failure of off‐axis loaded unidirectional glass/iPP composites

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