Residual stresses in unidirectional graphite fiber/polyimide composites as a function of aging

Gentz, M.; Benedikt, B.; Sutter, James K.; Kumosa, M.

doi:10.1016/j.compscitech.2003.12.006

Cited by 32 publications

(8 citation statements)

References 10 publications

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“…They appear because of the mismatch in the coefficient of thermal expansions between resin and fibers and between part and mould [118,119], as well as because of the volumetric changes in the resin during cure. Residual stresses are only partially relieved after demoulding leading to part distortion [119] as well as strength reductions [120][121][122]. Accurate predictions of the residual stress state at the micro and meso level require the use of specific models to account for the evolution of the viscoelastic response of the resin during manufacturing and, particularly, from the gelation point until the end of the process [124,125].…”

Section: Virtual Processingmentioning

confidence: 99%

Structural composites for multifunctional applications: Current challenges and future trends

González

Vilatela

Molina-Aldareguía

et al. 2017

Progress in Materials Science

236

132

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This review paper summarizes the current state-of-art and challenges for the future developments of fiber-reinforced composites for structural applications with multifunctional capabilities. After a brief analysis of the reasons of the successful incorporation of fiberreinforced composites in many different industrial sectors, the review analyzes three critical factors that will define the future of composites. The first one is the application of novel fiberdeposition and preforming techniques together with innovative liquid moulding strategies, which will be combined by optimization tools based on novel multiscale modelling approaches, so fiber-reinforced composites with optimized properties can be designed and manufactured for each application. In addition, composite applications will be enhanced by the incorporation of multifunctional capabilities. Among them, electrical conductivity, energy storage (structural supercapacitors and batteries) and energy harvesting (piezoelectric and solar energy) seem to be the most promising ones.

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Section: Virtual Processingmentioning

confidence: 99%

Structural composites for multifunctional applications: Current challenges and future trends

González

Vilatela

Molina-Aldareguía

et al. 2017

Progress in Materials Science

236

132

View full text Add to dashboard Cite

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“…Owing to this processing-route, thermal residual stresses arise due to the mismatch in coefficients of thermal expansion between the fibres and the resin. These residual stresses may lead to defects in the part in the form of voids and micro-cracking during processing, or warpage, spring-in, premature delamination or debonding after manufacture (Gentz et al, 2004). In order to understand the effects of residual stresses and find ways to decrease their magnitude, the relationships between the residual stress build-up and the material properties of the constituents together with processing parameters need to be explored.…”

Section: Introductionmentioning

confidence: 99%

An analytical model to predict residual thermal stress in 2D orthogonal plain weave fabric composites

Xiong

Shenoi

Gao

2009

International Journal of Solids and Structures

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a b s t r a c tThis paper seeks to address a practical rectangular truss model to predict residual thermal stress in a 2 D plain weave fabric (PWF) composite. The two orthogonal yarns in a micromechanical unit cell are idealized as straight rods subjected to tensile or compression loading resulting in extension or shortening deformation. The residual thermal stresses and equivalent thermal expansion coefficients in a PWF layer are derived from the thermal constitutive equations and the deformation compatibility condition. Based on the deformation compatibility equations, the thermal constitutive relationships for PWF composites are obtained to derive the residual thermal stresses between PWF plies and pure resin. In order to validate the model, experiments have been performed to investigate the mechanical properties of twodimensional (2D) orthogonal EW220/5284 PWF composites fabricated by resin transfer moulding (RTM). It is shown that the experimental results correlate well with predictions from the new model.

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“…Due to thermal anisotropy of composite materials as well as resin chemical shrinkage and tool-part interaction, residual stresses are generated in composite parts during curing [ 1 , 2 ]. After curing, these residual stresses will cause the geometrical deformation of composite parts that are removed from the tool [ 3 , 4 , 5 ]. It is very difficult to meet the manufacturing technical requirements when assembling deformed parts.…”

Section: Introductionmentioning

confidence: 99%

Modelling of Process-Induced Deformation for Composite Parts Considering Tool-Part Interaction

Qiao

Yao

2020

Materials

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Residual stresses are generated by tool-part interaction due to the large difference in the coefficients of thermal expansion (CTE) between the tool and the composite part, resulting in more process-induced part deformation. In this paper, a 3-D numerical model considering the influence of tool-part interaction is proposed to predict the deformation in complex-shape composite parts. In this numerical model, the existing path-dependent model is improved to consider the effect of tool-part interaction by adding the residual stress generated by tool-part interaction, and a simplified self-consistent micromechanics model is selected to predict the composite mechanical properties in the viscous and rubbery stages. The predicted and experimental spring-in angles of L- and U-shaped parts are compared. A good agreement shows the validity of the proposed numerical model. A parametric study is performed and the influence of part structural parameters on the spring-in angle is analyzed quantitatively. The results show that the spring-in angles caused by chemical shrinkage and tool-part interaction decrease with the increase of part thickness, but that caused by thermal contraction is almost constant.

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Residual stresses in unidirectional graphite fiber/polyimide composites as a function of aging

Cited by 32 publications

References 10 publications

Structural composites for multifunctional applications: Current challenges and future trends

Structural composites for multifunctional applications: Current challenges and future trends

An analytical model to predict residual thermal stress in 2D orthogonal plain weave fabric composites

Modelling of Process-Induced Deformation for Composite Parts Considering Tool-Part Interaction

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