Temperature dependence of off-axis tensile creep rupture behavior of a unidirectional carbon/epoxy laminate

Kawai, Masamichi; Sagawa, Takahiko

doi:10.1016/j.compositesa.2007.12.006

Cited by 24 publications

(5 citation statements)

References 25 publications

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“…Piyush et al [17] studied the creep behaviour of an E-glass/polyester composite. Their results were similar to those of Kawai and Sagawa [25], indicating decreases in the time of creep fracture and creep resistance with increasing either temperature and/or stress level.…”

Section: Introductionsupporting

confidence: 88%

Long-term creep behaviour of E-glass/epoxy composite: time-temperature superposition principle

Nosrati

Zabett

Sahebian

2020

Plastics, Rubber and Composites

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Creep behaviour of an epoxy matrix composite with a similar arrangement of composites used in a root joint of a wind turbine blade is investigated in this research. The vacuum infusion process was used to manufacture the composite. Due to the linearity of the viscoelastic behaviour of the composite, the time-temperature superposition principle (TTSP) is applied by using an activation energy shifting method to predict long-term creep behaviour. The activation energy (ΔH) is determined to be 281 kJ mol −1 . The calculated shift factor in generating the master curve at the reference temperature of 20°C is 4.75 for a 50°C-creep curve and 7.3 for a 70°C-creep curve. Under operating conditions of the root joint, namely at 20°C/40 MPa, the creep compliance is determined to be 0.63 × 10 −12 Pa −1 within 27.8 h (10 5 s) and increases to 8.6 × 10 −12 Pa −1 within 10 years (10 8.5 s). The creep compliance master curves at 20°C/40, 100 and 300 MPa within 1157 days (10 8 s) are determined to be 7.1 × 10 −12 , 12.5 × 10 −12 and 18.3 × 10 −12 Pa −1 , respectively. Scanning electron microscopy examination shows cusps, scarps and pull-out of fibres.

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Section: Introductionsupporting

confidence: 88%

Long-term creep behaviour of E-glass/epoxy composite: time-temperature superposition principle

Nosrati

Zabett

Sahebian

2020

Plastics, Rubber and Composites

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“…Accurate evaluation of the fatigue lives of CFRP structures also needs consideration of the effects of temperature and moisture, since hygro-thermal environments are often unfavorable for the properties of polymer matrices, especially epoxy resins, in CFRPs. [20,21] The static and fatigue strengths of CFRP at HT are usually lower than those at RT; this tendency has been reported for unidirectional carbon/epoxy laminates [22,23] and for woven fabric carbon/epoxy laminates. [24] A similar reduction in static and fatigue strengths due to temperature has also been observed for carbon fiber-reinforced thermoplastic matrix composites.…”

Section: Introductionmentioning

confidence: 91%

Anisomorphic constant fatigue life diagrams for quasi-isotropic woven fabric carbon/epoxy laminates under different hygro-thermal environments

Kawai

Yagihashi

Hoshi

et al. 2013

Advanced Composite Materials

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The effect of absorbed moisture on the fatigue strength of a plain-weave roving fabric carbon/epoxy quasi-isotropic laminate under constant amplitude loading at different stress ratios has been examined. First, constant amplitude fatigue tests are performed at room and high temperatures (HT), respectively, on the specimens immersed in hot water until saturation as well as on the specimens kept in a dry place. The results indicate that the fatigue lives of wet specimens are shorter than those of dry specimens, regardless of stress ratio as well as test temperature. The fatigue strength is reduced by about 11% due to water absorption at room temperature (RT), regardless of stress ratio. A similar reduction in fatigue strength can be seen in wet specimens at HT as well. Then, the full shapes of constant fatigue life (CFL) diagrams for the woven carbon fiber-reinforced plastic (CFRP) laminate in dry and wet environments are identified using fatigue test data obtained at different stress ratios and at different test temperatures. The results show that the experimental CFL diagrams are asymmetric and nonlinear, and the shape of CFL envelope gradually changes. Finally, the CFL diagrams for the woven CFRP laminate under uniaxial fatigue loading in different hygro-thermal environments are predicted using the anisomorphic CFL diagram approach for composites that was developed in an earlier study. Comparison with experimental results demonstrates that the anisomorphic CFL diagram approach is a promising step in predicting the CFL diagram for the woven CFRP laminate not only in a dry environment but also in a wet environment, regardless of test temperature.

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“…To consider these requirements, we apply a normalized grand master curve approach (Kawai & Sagawa, 2008). Accordingly, the reference SeN curve for the critical stress ratio at a given temperature should be predicted taking into account its dependence on stress ratio as well as on temperature.…”

Section: Temperature Dependence Of the Reference Sen Relationshipmentioning

confidence: 99%

“…A method for life-temperature interpolation or extrapolation has not been established for fatigue failure of polymer matrix composites yet. Here, we test for the analogy of the LarsoneMiller (LM) parameter (Larson & Miller, 1952) because it has successfully been applied to interpolation and extrapolation of creep rupture data for different kinds of polymeric materials over a range of temperatures (Challa & Progelhof, 1995;Kawai & Sagawa, 2008;). For a life scaling, therefore, we assume an analogy with a time scaling for creep rupture.…”

Section: A Life-temperature Extrapolation Parameter For Fatiguementioning

confidence: 99%

Temperature dependence of off-axis tensile creep rupture behavior of a unidirectional carbon/epoxy laminate

Cited by 24 publications

References 25 publications

Long-term creep behaviour of E-glass/epoxy composite: time-temperature superposition principle

Long-term creep behaviour of E-glass/epoxy composite: time-temperature superposition principle

Anisomorphic constant fatigue life diagrams for quasi-isotropic woven fabric carbon/epoxy laminates under different hygro-thermal environments

2D woven fabric composites under fatigue loading of different types and in different environmental conditions

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