The role of matrix cracks and fibre/matrix debonding on the stress transfer between fibre and matrix in a single fibre fragmentation test

Johnson, Anbu Clemensis; Hayes, Shannon; Jones, Frank R.

doi:10.1016/j.compositesa.2011.09.005

Cited by 34 publications

(11 citation statements)

References 18 publications

(29 reference statements)

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“…According to Ref. [48], the interfacial adhesion between fibers and matrix was so strong that matrix cracking occurred around the stretched fiber. Unfortunately, despite great efforts to eliminate the entrapped air during the fabrication process, some bubbles were still found, as shown in Figure 18a.…”

Section: Resultsmentioning

confidence: 99%

Thermal and Mechanical Properties of Bamboo Fiber Reinforced Epoxy Composites

et al. 2018

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Bamboo fibers demonstrate enormous potential as the reinforcement phase in composite materials. In this study, in order to find suitable NaOH concentration for bamboo fiber treatment, bamboo fibers were treated with 2 wt.%, 6 wt.% and 10 wt.% NaOH solutions for 12 h, respectively. We determined that 6 wt.% NaOH treated bamboo fibers were optimal for the fabrication of bamboo fiber composites by single fiber tensile test, single fiber pull-out test, Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). The short length bamboo fibers treated with 6 wt.% NaOH solutions were well dispersed in the epoxy matrix by a new preparation method. The effect of fiber content and fiber length on the mechanical behavior of bamboo fiber reinforced epoxy composites was investigated. The results confirmed that fracture toughness and flexural modulus of the composites monotonically increased with fiber length and content. However, for all samples, composites showed negligible difference on the flexural strength. The fracture surfaces of the composites were observed by SEM, revealing that fiber breakage, matrix cracking, debonding, and fiber pull out were major failure types. In addition, thermogravimetric analysis (TGA) was carried out to investigate the thermal behavior of both bamboo fibers and composites.

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Section: Resultsmentioning

confidence: 99%

Thermal and Mechanical Properties of Bamboo Fiber Reinforced Epoxy Composites

et al. 2018

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“…Matrix properties within the composite were measured by means of nanoidentation [13] while push-in tests of single fibres within the laminate were used to determine the interface strength [38,39]. Push in tests were preferred instead of single fibre fragmentation tests [40,41] or microbond tests [42] to measure the fibre-matrix interface properties because they are influenced by the fibre packing density and the degree of matrix cure, which are accounted for in the push-in tests. The interlaminar shear strength was determined by means of a short-beam three point bending test [43] while optical and scanning electron microscopy were used to assess the void content and fracture mechanisms, respectively.…”

Section: Mechanical Characterizationmentioning

confidence: 99%

The role of interfacial properties on the intralaminar and interlaminar damage behaviour of unidirectional composite laminates: Experimental characterization and multiscale modelling

Tan

Naya

Yang

et al. 2018

Composites Part B: Engineering

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The development of the latest generation of wide-body passenger aircraft has heralded a new era in the utilisation of carbon-fibre composite materials. One of the primary challenges facing future development programmes is the desire to reduce the extent of physical testing, required as part of the certification process, by adopting a 'certification by simulation' approach. A hierarchical bottom-up multiscale simulation scheme can be an efficient approach that takes advantage of the natural separation of length scales between different entities 2 (fibre/matrix, ply, laminate and component) in composite structures. In this work, composites with various fibre/matrix and interlaminar interfacial properties were fabricated using an autoclave under curing pressures ranging from 0 to 0.8 MPa. The microstructure (mainly void content and spatial distribution) and the mechanical properties of the matrix and fibre/matrix interface were measured, the latter by means of nano-indentation tests in matrix pockets, and fibre push-in tests. In addition, the macroscopic interlaminar shear strength was determined by means of three-points bend tests on short beams. To understand the influence of interfacial properties on the intralaminar failure behaviour, a high-fidelity microscale computational model is presented to predict homogenized ply properties under shear loading. Predicted ply material parameters are then transferred to a mesoscale composite damage model to reveal the interaction between intralaminar and interlaminar damage behaviour of composite laminates.

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“…During the fracture of fibers in composites, energy is dissipated to the surrounding matrix. This often results in shear debonding of the polymer from the glass surface near fracture sites 31, 32. Therefore, the observed loss of the protein's fluorescence is most likely caused by a mechanically induced unfolding of the eYFP.…”

Section: Methodsmentioning

confidence: 99%