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Fracture mechanisms and failure analysis of carbon fibre/toughened epoxy composites subjected to compressive loading

Fracture mechanisms and failure analysis of carbon fibre/toughened epoxy composites subjected to compressive loading,10.1016/j.compstruct.2009.08.010,

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Fracture mechanisms and failure analysis of carbon fibre/toughened epoxy composites subjected to compressive loading   (Citations: 3)
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This study investigates the failure mechanisms of unidirectional (UD) HTS40/977-2 toughened resin composites subjected to longitudinal compressive loading. A possible sequence of failure initiation and propagation was proposed based on SEM and optical microscopy observations of failed specimens. The micrographs revealed that the misaligned fibres failed in two points upon reaching maximum micro-bending deformation and two planes of fracture were created to form a kink band. Therefore, fibre microbuckling and fibre kinking models were implemented to predict the compressive strength of UD HTS40/977-2 composite laminate. The analysis identified several parameters that were responsible for the microbuckling and kinking failure mechanisms. The effects of these parameters on the compressive strength of the UD HTS40/977-2 composite systems were discussed. The predicted compressive strength using a newly developed combined modes model showed a very good agreement to the measured value.
Journal: Composite Structures - COMPOS STRUCT , vol. 92, no. 2, pp. 295-305, 2010
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    • ...Jumahat et al. [15] proposed a combined modes model based on Berbinau et al. [3] fiber micro buckling model and Budiansky et al. [13] fiber kinking model...
    • ...Fig. 3 Comparison of predicted compressive strength with various models for UD HTS40/ 977-2 CFRP laminated composite [15] 178 Appl Compos Mater (2011) 18:175–196...
    • ...The obtained results from the strain based model are compared with those predicted by the combined modes model proposed by Jumahat et al. [15], for the laminate made of UD HTS40/977-2...
    • ...The nonlinear shear stress-strain behavior for UD HTS40/977-2 is shown in Fig. 11 [15]...
    • ...θi (°) 5 3 2 1 XC (combined modes model) 461 672 854 1,191 XC (strain based model) 565 (instability) 792 (instability) 1,004 (instability) 1,454 (instability) Fig. 11 In-plane shear stress-strain response of � 45 HTS40/977-2 laminated composite [15] 192 Appl Compos Mater (2011) 18:175–196...

    Abdulreza Kabiri Ataabadi, et al. An Improved Model for Fiber Kinking Analysis of Unidirectional Laminat...

    • ...damage phenomena observed in this and previous experimental works [27, 28]...
    • ...Moreover, the valid measurement of the compressive response of CFRP has always presented difficulties [28, 29]...

    Aidah Jumahat, et al. A Graphical Method Predicting the Compressive Strength of Toughened Un...

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