Effects of Out-of-Plane Properties on Distortions of Composite Panels

Wijskamp, Sebastiaan; Lamers, E.A.D.; Akkerman, Remko

doi:10.1533/9780857093134.361

Cited by 11 publications

(12 citation statements)

References 6 publications

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“…Further, the thermal and the mechanical boundary conditions exerted by both mould halves will be different: a good conductor and a rigid surface on one side versus a good thermal insulator and a stretchable surface on the other side. This provides ample ingredients for unbalanced residual stresses in the resulting composite parts, as was elucidated by Wijskamp (2005). These residual stresses make it difficult to produce press formed composite parts with high geometrical precision.…”

Section: Fabric-reinforced Laminatesmentioning

confidence: 98%

Thermoplastic composites manufacturing by thermoforming

Akkerman

Haanappel

2015

Advances in Composites Manufacturing and Process Design

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Section: Fabric-reinforced Laminatesmentioning

confidence: 98%

Thermoplastic composites manufacturing by thermoforming

Akkerman

Haanappel

2015

Advances in Composites Manufacturing and Process Design

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“…V f is the fibre volume content and V sh is the total chemical volumetric shrinkage of the matrix system. Alternative mixing rules can be found in the literature by Wijskamp 24 and Brauner. 8 …”

Section: Thermochemical and Mechanical Modelling Of The Composite Pro...mentioning

confidence: 99%

Assessment of structural integrity of thermoset composite parts subjected to accelerated cooling during the manufacturing process using Puck criteria for failure initiation

Stolz¹,

Fideu

Herrmann³

2022

Journal of Composite Materials

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For many applications, the production of large-scale lightweight parts using composite materials requires a curing stage at elevated temperatures with long cycles resulting from necessary heating and cooling steps. Here, an accelerated cooling stage after curing of the matrix can shorten process times and make it possible to demould the components in a hot state. In this paper, the impact of higher cooling rates on residual stresses and strains and the criticality for internal failures are investigated. A literature model using the pultrusion process including thick laminates and the interaction with a production tool was used for the implementation of a thermochemical calculation and an incremental linear-elastic mechanical model to calculate residual stresses induced during manufacturing stage. This way, the capability of flexible simulation environments for handling state of the art calculation schemes is investigated to allow the extension of the physics of those models. The model is implemented in both a representative environment for advanced structural analysis with highly customised element formulation such as Abaqus and a general-purpose FE package. Here, Comsol Multiphysics is used and extended by the calculation of the inter-fibre failure initiation. Using the proposed models applied to a plate geometry, stresses and strains induced in different cooling scenarios are investigated. The assumptions are validated by simulations including the whole curing process, by manufacturing trials on the coupon level and with mechanical tests.

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“…Process-induced effects in composite materials have been studied extensively over the last decades. Multiple PhD researches have been dedicated to predicting distortions [2][3][4][5][6]. In addition, a thorough review of shape distortion models is given by Abouhamzeh [7].…”

Section: Introductionmentioning

confidence: 99%

“…In Section 2 the used materials and overview of the modelling strategy is given. An AS4/8552 material is used because of the extensive material data available in literature [22,4,23]. Using this model the cure-cycle has been investigated of which the results are shown and discussed in Section 3.…”

Section: Introductionmentioning

confidence: 99%

Virtual manufacturing of thick composite beams, investigating cure cycle and shrinkage induced stress

Vroon,

van Hoorn

2023

9th ECCOMAS Thematic Conference on the Mechanical Response of Composites

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Investigating cure shrinkage-induced stress in thick composite beams by virtual manufacturing is the focus of this study. The research aims to understand the behaviour of thick-walled composite structures, particularly in relation to curing shrinkage-induced damages. The curing process of resin is simulated thermally and mechanically to investigate the residual cure-induced stress. The study utilizes a finite element model in Abaqus, considering material properties, mesh, boundary conditions, and user subroutines. Ten different cure cycles are investigated, showing improvements in reducing internal stresses after curing compared to the manufacturer's cycle of about 20%. However, during curing, the investigated cycles provide marginal improvements. This study demonstrates the potential for optimizing cure cycles to reduce internal stresses in thick-walled applications. It is important to note that the proposed method is not experimentally validated and requires accurate measurements for validation.

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Effects of Out-of-Plane Properties on Distortions of Composite Panels

Cited by 11 publications

References 6 publications

Thermoplastic composites manufacturing by thermoforming

Thermoplastic composites manufacturing by thermoforming

Assessment of structural integrity of thermoset composite parts subjected to accelerated cooling during the manufacturing process using Puck criteria for failure initiation

Virtual manufacturing of thick composite beams, investigating cure cycle and shrinkage induced stress

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