Stress concentration in a circular hole in composite plate

Toubal, Lotfi; Karama, Moussa; Lorrain, Bernard

doi:10.1016/j.compstruct.2004.02.016

Cited by 211 publications

(119 citation statements)

References 7 publications

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“…All of these factors affect the mechanical properties by changing the extent of damage growth during loading, and interact with each other to enhance the individual effects [1]. For example, in terms of woven fabric composites with holes, the magnitude and severity of strain concentration is strongly influenced by the tensile loading direction, hole geometry and its dimension relative to the unit cell of the plain woven fabrics [4,5]. On the other hand, for 3D woven carbon/epoxy composites, the notched tensile strength is less than 17% lower than the un-notched tensile strength and it is not very sensitive to the notch size [6].…”

Section: Introductionmentioning

confidence: 99%

Effects of external patch configuration on repaired composite laminates subjected to multi-impacts

Coelho

Reis

Ferreira

et al. 2017

Composite Structures

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Please cite this article as: Santos, R.A.M., Reis, P.N.B., Santos, M.J., Coelho, C.A.C.P., Effect of distance between impact point and hole position on the impact fatigue strength of composite laminates, Composite Structures (2017), doi: http://dx.doi.org/10. 1016/j.compstruct.2017.02.045 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. In terms of multi-impacts, the damage severity is also very influenced by the distance. For small distances the damage progresses quickly, while three stages can be found for the control samples and for the distance of 20 mm. Effect of distance between impact

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Section: Introductionmentioning

confidence: 99%

Effects of external patch configuration on repaired composite laminates subjected to multi-impacts

Coelho

Reis

Ferreira

et al. 2017

Composite Structures

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“…As a consequence, this weaken the FRP component significant and prevent the optimal exploitation of the high anisotropic lightweight potential of the composites (Seidlitz et al, 2014). Since there is an Increasing usage of FRP laminates in the design of structural parts with high mechanical performance, fatigue behavior of holed FRP laminates requires a better understanding (Kroll et al, 2017;Toubal, Karama, & Lorrain, 2005).…”

Section: Introductionmentioning

confidence: 99%

Study on the Quality of Quasi-Isotropic Composite Laminates Containing a Circular Hole

Balakrishnan¹,

Seidlitz²,

Ambrosio³

et al. 2017

JMSR

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Composite structures used in modern engineering applications are often subjected to circular holes in order to join with metal components via riveting, bolting or pinning joints. These design based holes will interrupt the force flux in the direction of the fibers and create high stress concentrations near the notched area. Objective of the project is to understand the quality of the quasi-isotropic composite laminates ([45°, -45°, 0°, 90°] S ) containing circular hole. To achieve this objective, a 3-phase portal milling machine and a 5kW continuous wave (cw) CO 2 laser system were used to produce the circular holes in the composite laminates. The processing parameters for both the processes are varied to understand its influence. The quality of the circular hole produced by these methods are further investigated and compared in order to arrive at the optimum processing parameters for the given quasi-isotropic composite laminates.The hole qualities were evaluated by means of delamination factor caused by milling; cone angle, matrix evaporation for cw-CO 2 laser system. For further comparisons, the optimal parameter combinations of both methods were selected for a tensile test according to the standard ASTM D5766-2002.

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“…These types of geometric discontinuities are often necessary to establish links between structural project mechanisms and may generate serious problems in the distribution of internal stresses to the structural element, originating "stress concentration areas" [2][3][4][5][6] . This phenomenon has a direct influence on final fracture, since it concentrates the fracture region in the geometric discontinuity section, primarily in polymer composites composed of a material considered "brittle" 7 .…”

Section: Introductionmentioning

confidence: 99%

Fracture characteristics and anisotropy in notched glass fiber reinforced plastics

Tinô

Aquino

2014

Mat. Res.

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The damage mechanism of reinforced plastics may be present in many different ways, since it depends on many factors. Highlights may be given to the effect of stress concentration in of geometric discontinuity in the sections of these structural elements, which in general always leads to certain characteristics of the fracture. In the case of glass fiber reinforced plastics (GFRP) it is expected the same tendency, beyond the influence of reinforcement and its internal orientation in the layers (anisotropy). The aims of this work are detailed study of the influence of the holes (longituninal section) in the characteristic fracture in GFRP submitted to tensile loading. Three different configurations of composite laminates were studied: two reinforced with Eglassfiber bidirectional textil fabric and the other only with short mats, also Eglassfiber. The results showed the influence of all parameters listed above in the final fracture characteristics and residual properties.

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Stress concentration in a circular hole in composite plate

Cited by 211 publications

References 7 publications

Effects of external patch configuration on repaired composite laminates subjected to multi-impacts

Effects of external patch configuration on repaired composite laminates subjected to multi-impacts

Study on the Quality of Quasi-Isotropic Composite Laminates Containing a Circular Hole

Fracture characteristics and anisotropy in notched glass fiber reinforced plastics

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