Experimental analysis of the effects of wrinkles in the radius of curvature of L-shaped carbon-epoxy specimens on unfolding failure

Journoud, Pierre; Castanié, Bruno; Ratsifandrihana, Léon

doi:10.1016/j.compositesa.2022.106975

Cited by 8 publications

(2 citation statements)

References 36 publications

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“…Figure 13 illustrates the main steps in the sample manufacturing. The L-stiffener was manufactured in a convex aluminium mould (Figure 13-stiffener)-as described by Journoud et al [40], who studied curvature defects-with an inner corner radius of 2.5 mm. The mould was milled with 92 • between the two useful faces, so the composite spring-back would lead to a 90 • angle between the stiffener flange and web.…”

Section: Manufacturingmentioning

confidence: 99%

Design and Testing of Impacted Stiffened CFRP Panels under Compression with the VERTEX Test Rig

2023

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Aeronautical composite primary structures must evidence sufficient residual strength in the presence of damage for compliance with damage tolerance requirements. The study of stiffener debonding on panels subjected to compression after impact is performed in that scope. Compression leads to the buckling of the skin between the stiffeners, and thus a complex loading of the bonding between the skin and the stiffener. This paper describes the development of a stiffened specimen for the VERTEX multiaxial test rig as a first step towards the study of the damage tolerance evaluation of stiffened structures, under combined loadings and at the intermediate scale of the test pyramid. By using virtual testing, the specimen was designed to produce the phenomenology of interest as the first damage, i.e., the debonding of the stiffener from the centre. Three samples were manufactured and subjected to low velocity impacts at various locations and energies. Then the three samples were subjected to compression after impact, up to the stiffener debonding, under a post-buckling regime of the skin. Test loading evolution is described with force fluxes and global strains, obtained from in situ stereo-correlation. The different impacts were found to give different types of damage but similar residual strength to compression after impact.

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Section: Manufacturingmentioning

confidence: 99%

Design and Testing of Impacted Stiffened CFRP Panels under Compression with the VERTEX Test Rig

2023

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“…These studies were carried out under static [ 18 , 19 ] and fatigue loading [ 18 , 25 , 26 ]. The experimental and numerical analysis of curved laminates has been carried out in many papers, e.g., [ 27 , 28 , 29 , 30 , 31 ]. Woo et al [ 32 ] experimentally and numerically analyzed the influence of manufacturing defects on the delamination behavior of carbon fiber (CFRP) L-shaped composite beams.…”

Section: Introductionmentioning

confidence: 99%

Evaluation and Defect Detection in L-Shaped GFRP Laminates by Infrared Thermography

Chwał,

Stawiarski,

Barski

et al. 2024

Materials

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Glass fiber-reinforced polymer (GFRP) laminates are used in many applications because of their availability, high mechanical properties, and cost-effectiveness. Fiber defects in the form of waviness or wrinkles can occur during the production of multilayered laminates. When curved laminates of significant thickness are produced, the likelihood of such defects increases. Studies have confirmed that fiber deformation during manufacture leads to a reduction in the mechanical properties of laminates. Therefore, early detection of such defects is essential. The main part of this paper deals with research into the possibility of using active infrared thermography to detect wrinkles in curved multilayered GFRP laminates. The size of the artificial wrinkles was assessed by analyzing scans and microimages. The shape deformations of the samples were evaluated by comparing the samples with the mold and the assumed nominal shape. The influence of the out-of-autoclave manufacturing process on the reduction in wrinkles formed without significantly affecting the internal structure of the laminate is presented in this work. This research demonstrated the ability to detect wrinkles in thick curved laminates using active infrared thermography. However, it also showed how the interpretation of the thermographic results is affected by the curvature of the structure, the lack of uniform heating, and the configuration of the thermographic setup.

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Numerical analysis of the effects of wrinkles in the radius of curvature of L-shaped CFRP specimens on unfolding failure

Journoud

Castanié

Ratsifandrihana³

2022

Composite Structures

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Experimental analysis of the effects of wrinkles in the radius of curvature of L-shaped carbon-epoxy specimens on unfolding failure

Cited by 8 publications

References 36 publications

Design and Testing of Impacted Stiffened CFRP Panels under Compression with the VERTEX Test Rig

Design and Testing of Impacted Stiffened CFRP Panels under Compression with the VERTEX Test Rig

Evaluation and Defect Detection in L-Shaped GFRP Laminates by Infrared Thermography

Numerical analysis of the effects of wrinkles in the radius of curvature of L-shaped CFRP specimens on unfolding failure

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