Micromechanical modeling of the mechanical behavior of unidirectional composites – A comparative study

Heidari-Rarani, M.; Bashandeh-Khodaei-Naeini, K; Mirkhalaf, Mohsen

doi:10.1177/0731684418779441

Cited by 32 publications

(16 citation statements)

References 95 publications

(152 reference statements)

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“…28 The influence on the strength parameters is estimated by the bridging model described by Heidari-Rarani et al. 29 Using these rules of mixture, the material parameter reduction due to the differing fibre volume fraction is computed and the parameters are corrected by this value. These corrected parameter values are drawn as black dots and black lines into the graphs.…”

Section: Resultsmentioning

confidence: 99%

Fatigue of fibre-reinforced plastics due to cryogenic thermal cycling

Lüders

Sinapius

2019

Journal of Composite Materials

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Due to the different thermal expansion of the constituent materials, cyclic thermal loading of fibre reinforced plastics induces alternating stresses in the material at two scales: (1) at the microscale (level of fibre–matrix-interaction) and (2) at the macroscale (level of the multidirectional laminate). Especially the effect of the thermal-induced stresses at the microscale is not comprehensively investigated yet. In the present paper, the effects of both scales are analysed. For the investigation of the microscale effect, unidirectional laminates are thermally cycled between 293 K and 90 K up to 1000 times. Afterwards, by mechanical tests at room temperature, the elasticity and strength properties in the different material directions are determined as function of the number of thermal cycles. Additionally, thermally cycled specimens are microscopically investigated in order to observe the matrix crack forming process at thermal fatigue loading. Contrary to the expectations, no significant matrix cracking and therefore no significant reduction of the elasticity and strength properties due to the thermal cycling are observed. In order to analyse the effect of the superposition of the thermal-induced stresses on micro- and macroscale, cross-ply laminates are investigated in the same manner. In these laminates matrix cracks are detected after 1000 cycles, which, however, do not reduce the stiffness and strength of the cross-ply laminates.

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Section: Resultsmentioning

confidence: 99%

Fatigue of fibre-reinforced plastics due to cryogenic thermal cycling

Lüders

Sinapius

2019

Journal of Composite Materials

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“…While the resulting strength of non-undulated CoFRPs is widely evaluated, both experimentally and numerically [ 19 , 20 , 21 , 23 , 44 , 45 , 46 , 47 , 48 , 49 ], the occurring waviness in composites is in most cases evaluated only for compression loads [ 10 , 11 , 12 , 13 , 14 ]. This is caused by the fact that intrinsic waviness of the unidirectional fabric is the main reason for compression failure.…”

Section: Analytical Methods For Stiffness and Failure Modeling Witmentioning

confidence: 99%

“…Of all the illustrated deformation modes ( Figure 1 ), only the simple shear mode ( Figure 1 f) does not have an impact on the resulting FVC, since the rovings can slide along each other. While the impact of FVC on material properties in fiber direction can be easily determined by applying a parallel-connected model [ 19 , 20 , 21 ], the properties in transverse fiber direction need to be determined by coupon tests. There have been few experimental studies in which the resulting material stiffness is analyzed by a variation of FVC [ 19 , 21 , 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

“…While the impact of FVC on material properties in fiber direction can be easily determined by applying a parallel-connected model [ 19 , 20 , 21 ], the properties in transverse fiber direction need to be determined by coupon tests. There have been few experimental studies in which the resulting material stiffness is analyzed by a variation of FVC [ 19 , 21 , 22 , 23 ]. The resulting transverse strength values and the in-plane shear strength have been analyzed either by adjusting the laminate thickness or the areal weight of the fabric [ 19 , 22 , 24 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

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The Impact of Draping Effects on the Stiffness and Failure Behavior of Unidirectional Non-Crimp Fabric Fiber Reinforced Composites

et al. 2020

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Unidirectional non-crimp fabrics (UD-NCF) are often used to exploit the lightweight potential of continuous fiber reinforced plastics (CoFRP). During the draping process, the UD-NCF fabric can undergo large deformations that alter the local fiber orientation, the local fiber volume content (FVC) and create local fiber waviness. Especially the FVC is affected and has a large impact on the mechanical properties. This impact, resulting from different deformation modes during draping, is in general not considered in composite design processes. To analyze the impact of different draping effects on the mechanical properties and the failure behavior of UD-NCF composites, experimental results of reference laminates are compared to the results of laminates with specifically induced draping effects, such as non-constant FVC and fiber waviness. Furthermore, an analytical model to predict the failure strengths of UD laminates with in-plane waviness is introduced. The resulting stiffness and strength values for different FVC or amplitude to wavelength configurations are presented and discussed. In addition, failure envelopes based on the PUCK failure criterion for each draping effect are derived, which show a clear specific impact on the mechanical properties. The findings suggest that each draping effect leads to a “new fabric” type. Additionally, analytical models are introduced and the experimental results are compared to the predictions. Results indicate that the models provide reliable predictions for each draping effect. Recommendations regarding necessary tests to consider each draping effect are presented. As a further prospect the resulting stiffness and strength values for each draping effect can be used for a more accurate prediction of the structural performance of CoFRP parts.

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“…To calculate the final TBC values, Chamis equations were used based on the agreement of the values calculated with the experimental values. [34][35][36] The compliance and stiffness matrices of the TBC are given by equations (10) and (11) (10)…”

Section: Impact Testmentioning

confidence: 99%

Fabrication and mechanical characterization of glass fibre reinforced triaxially braided composites

Marrivada

Chaganti

Sujith

2020

Journal of Composite Materials

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The aim of this research work is to study the mechanical behaviour of dry triaxially braided glass fibre sleeves and its composites experimentally and analytically. The braided glass fibre sleeves for three angles 30°, 45° and 60° were fabricated on a modified maypole vertical braider following a regular braid architecture. Tensile, flexural, short beam shear and impact tests were performed to evaluate the mechanical properties of the composites. A numerical model was developed, which can be used to find the elastic properties and mechanical strength values of the dry braided fabric and its composites. It was observed that the tensile, flexural and interlaminar properties of 30° specimens were more compared to 45° and 60°. The difference between the estimated and experimental values were found to be an average of 8% for tensile moduli and 24% for the tensile strength.

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Micromechanical modeling of the mechanical behavior of unidirectional composites – A comparative study

Cited by 32 publications

References 95 publications

Fatigue of fibre-reinforced plastics due to cryogenic thermal cycling

Fatigue of fibre-reinforced plastics due to cryogenic thermal cycling

The Impact of Draping Effects on the Stiffness and Failure Behavior of Unidirectional Non-Crimp Fabric Fiber Reinforced Composites

Fabrication and mechanical characterization of glass fibre reinforced triaxially braided composites

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