An assessment of failure criteria for fibrereinforced composite laminates

Chandler, H.D.; Campbell, Ian; Stone, M.

doi:10.1016/0142-1123(95)00047-w

Cited by 6 publications

(4 citation statements)

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“…Specimens with braided reinforcement can be mechanically characterised best by axial compression tests. The reason for this is that, at braiding angles of AE45 , the mechanical properties are no more dominated by the fibres, but more by the quality of the matrix and the impregnation [20]. In order to get precise results, an extended length of the specimens would be useful.…”

Section: Characterisation Methodsmentioning

confidence: 99%

Pultrusion of Thermoplastic Composites - New Developments and Modelling Studies

Bechtold

Wiedmer

Friedrich

2002

Journal of Thermoplastic Composite Materials

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Objective of this study is to present new developments in thermo-plastic pultrusion (a pullbraiding process combined with a contact preheating system, and a new online forming method for pultruded profiles) and a new approach for modelling of the preheating process. After modelling of the preheating process of commingled glass fibre/polypropylene yarn, the preheating of a thermoplastic pultrusion line to produce profiles with unidirectional reinforcement in axial direction was modified by adding contact heating pins. Compared to the convective heating used before, profiles with higher qualities could be produced at three times higher processing speeds. First trials of a combined braiding and pultrusion process, also with contact preheating, led to promising results. Furthermore, a process to post-form pultruded profiles immediately after leaving the heated pultrusion die was developed, leading to profiles with a forming radiusof 10 cm.

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Section: Characterisation Methodsmentioning

confidence: 99%

Pultrusion of Thermoplastic Composites - New Developments and Modelling Studies

Bechtold

Wiedmer

Friedrich

2002

Journal of Thermoplastic Composite Materials

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“…However, in the new criteria, the contribution of shear stress to fiber breakage was omitted, and the effect of compression on fiber/matrix failure was not shown. Chandler, Campbell, and Stone also treated fiber failure and matrix failure separately: fiber fails when critical rupture value is reached whereas matrix fails when the Mohr-Coulomb criterion is satisfied [15]. Christensen also derived a different governing criterion for fiber/ matrix dominated failure considering interaction between stress components [16].…”

Section: Introductionmentioning

confidence: 99%

Micro-Mechanics of Failure (MMF) for Continuous Fiber Reinforced Composites

Jin

Huang

2008

Journal of Composite Materials

137

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The micromechanics of failure was developed to predict the failure of continuous fiber reinforced composites. A micromechanical approach using unit cells of square and hexagonal arrays was employed to compute the micro stresses of constituents and at the fiber—matrix interface, which were used to determine the failure initiation of a unidirectional ply. The constituent properties include two tensile and compressive strengths of fiber and matrix, plus normal and shear strengths at the interface. The matrix and interfacial dominated strength properties are determined by matching the micro stresses at the constituent levels with the observed transverse tensile and compressive strengths on the macro ply level. The longitudinal shear failure is then expected to be a result of damage progression after initial failure. Based on the current MMF, in the graphite/epoxy considered in this study both transverse tensile and compressive failure are expected to occur via matrix failure. However, in the glass/epoxy the transverse tensile and compressive failures are respectively caused by matrix failure and interfacial tensile failure. These predictions are compared with predictions from other widely used failure criteria as well as experimental data. Lastly, we predicted the failure of laminates. Instead of using a unidirectional ply-based failure theory, starting with the fiber, matrix, and their interface will lead to a much simpler, more generic theory.

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“…They also extended this model for non-linear shear response resulting in better correspondence with test results [27]. A comparison of several failure criteria with experimental results was carried out by Chandler et al [28]. They test mainly their simple micro-mechanical (SMM) criterion which accounts for separate matrix fracture using the Coloumb-Mohr theory.…”

Section: Introductionmentioning

confidence: 99%

Progressive Damage of Unidirectional Composite Panels

Laš

Zemčík

2008

Journal of Composite Materials

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This work focuses on the numerical simulation of damage and fracture of unidirectional fiber-reinforced composite structures using the finite element method. A computational model is presented which can predict initial failure and is capable of the simulation of the subsequent process of local material damage up to final fracture. This procedure also known as progressive failure analysis originally combines Puck's failure criterion for the prediction of local failure and an innovative stiffness degradation approach for the simulation of resulting damage. The performance of the proposed model is demonstrated on examples of tensile tests of single-ply fiber-reinforced panels having different fiber orientations with and without stress concentrators. The numerical simulation is performed both as quasi-static and transient analysis and it involves identification and repetitive adjustment of material properties. The comparison of the results from experiment and from the simulation yields satisfactory agreement.

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An assessment of failure criteria for fibrereinforced composite laminates

Cited by 6 publications

References 0 publications

Pultrusion of Thermoplastic Composites - New Developments and Modelling Studies

Pultrusion of Thermoplastic Composites - New Developments and Modelling Studies

Micro-Mechanics of Failure (MMF) for Continuous Fiber Reinforced Composites

Progressive Damage of Unidirectional Composite Panels

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