On the optimal design of manufacturing-induced residual stresses in filament wound carbon fiber composite cylindrical shells reinforced with carbon nanotubes

Asghari, Behzad; Ghasemi, Ahmad Reza; Tabatabaeian, Ali

doi:10.1016/j.compscitech.2019.107743

Cited by 28 publications

(12 citation statements)

References 47 publications

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“…[ 159 ] Moreover, it was revealed that surface compressive residual stress is influenced by the implementation of cold compression to a higher degree than the interior tensile stresses. [ 160 ] Accomplishing slitting technique coupled with statistical analyses, Asghari et al [ 161 ] scrutinized the impact of the cooling condition on the residual stresses of CFRP shells, reporting that temperature differences between curing and cooling conditions induce thermal shock, resulting in the building up of high residual stress levels, which, in turn, accelerates the structural failure. Simultaneous cooling conditions and CNT reinforcement effects were studied in another paper, [ 162 ] indicating that the influence of cooling conditions on the residual thermal stresses becomes more significant when the CNT percentage decreases.…”

Section: Origins and Effectsmentioning

confidence: 99%

Residual Stress in Engineering Materials: A Review

et al. 2021

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The accurate determination of residual stresses has a crucial role in understanding the complex interactions between microstructure, mechanical state, mode(s) of failure, and structural integrity. Moreover, the residual stress management concept contributes to industrial applications, aiming to improve the product's service performance and life cycle. In this regard, the industry requests rapid, efficient, and modern methods to identify and control the residual stress state. This review article contains three main sections. The first section covers different residual stress determination methods and reports the advancements over the recent decade. The second section includes the role of residual stresses in the performance of a broad range of materials including metallic alloys, polymers, ceramics, composites, and biomaterials. This is presented by classifying different science areas dealing with residual stresses into two main groups, including “origins” and “effects” of residual stresses. The range of topics covered are “welding, machining, curing/cooling, and spray coating processes,” “medical and dental sciences,” and “fatigue and fracture mechanisms.” The third section summarizes various strategies to effectively control residual stresses through different manufacturing procedures. It is hoped that the data provided herein serves as a valuable up‐to‐date reference for engineers and scientists in the field of residual stress.

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Section: Origins and Effectsmentioning

confidence: 99%

Residual Stress in Engineering Materials: A Review

et al. 2021

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“…Therefore, it was recommended to first reduce the cooling rate during the curing process to avoid possible cracks in the matrix when the ambient temperature is reached. In another work [ 15 ] the residual stresses were calculated for different cooling conditions at temperatures 0 °C and 25 °C. It has been shown that the significant differences in temperature between the curing and cooling conditions resulted in direct thermal shock, and a considerable amount of residual stress was created.…”

Section: Introductionmentioning

confidence: 99%

“…One of the most widespread experimental methods is the slitting method [ 6 , 18 , 19 , 20 ] which is used as a primary investigation method in the presented paper. In the light of the works [ 14 , 15 ], the nature of the process optimization possibilities arises, not so much from a change in the isothermal conditions of the cooling, but from a process medium that allows receiving heat at different speeds, thus clearly influencing the overall cooling conditions. Recently, in the paper [ 20 ] a comparative analysis was performed, but only for flat components.…”

Section: Introductionmentioning

confidence: 99%

The Mechanical Investigation of Filament-Wound CFRP Structures Subjected to Different Cooling Rates in Terms of Compressive Loading and Residual Stresses—An Experimental Approach

et al. 2021

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Although cooling at ambient temperature is widely used and is said to be safe and convenient, faster cooling may have an influence not only on the time of the manufacturing process but also on the mechanical response, especially the residual stress. The study aimed to investigate the influence of the cooling rate after curing on the mechanical response of filament-wound thick-walled carbon fiber reinforced polymer (CFRP) rings. Three cooling rates were taking into consideration: cooling with the oven, at room temperature, and in the water at 20 °C. The splitting method was used to examine the residual strains. In the radial compression test, the mechanical response was investigated between the rings with different cooling regimes. The FEM analysis of the compression test in elastic range was also performed. Both the splitting method and the radial compression test showed no significant difference in the mechanical response of the CFRP rings. The presented results showed that the fast-cooling rate slightly decreases the mechanical performance of the filament-wound rings.

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“…Quantitative evaluation of the strand response is thus decisive to determine the best design for wound wire structures. For this reason, a large number of experimental tests have been conducted with specific applications in mind [6,7,8,9]. Other authors have instead developed theoretical models for more general cases, thus enabling to predict the global mechanical response of a strand starting from wire material properties and geometrical configurations.…”

Section: Introductionmentioning

confidence: 99%

Unveiling a new shear stress transfer mechanism in composites with helically wound hierarchical fibres

Cutolo¹,

Carotenuto²,

Palumbo³

et al. 2021

International Journal of Mechanical Sciences

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The mechanical performance of reinforced composites is strongly influenced at different scales by the stress transferred at the matrix-fibre interfaces and at any surface where material discontinuity occurs. In particular, the mechanical response of elastomeric composites where the reinforcement is composed by cords with helically wound fibres is heavily compromised by fatigue and delamination phenomena occurring at cord-rubber as well as at the ply interfaces, since rubber and polymeric matrices are mainly vulnerable to the accumulation of deviatoric energy due to the shear stresses transferred across the surfaces. Despite the large diffusion of composites in a vast field of applications and the mature knowledge of their behaviour, some key mechanical aspects underlying failure mechanisms are still partially unclear. For example, stress amplification and strain localization are often difficult to predict by means of analytical solutions and averaging techniques that usually conceal stress gradients. In this work, we analyse coupling between torsional and tensile loads in twisted cords, which are adopted in many cases to reinforce composites and rubbers in tire applications. We provide a model characterized by an enriched cord-matrix mechanical interplay able to theoretically explain and predict actual stress distributions responsible for the onset of delamination and fatigue-guided phenomena that are experimentally observed in these composites. In particular, we demonstrate that the assumption of a monoclinic/trigonal behaviour for the mechanical response of the hierarchical strands allows to estimate, by means of analytical formulas and a homogenization approach, hitherto neglected shear stresses at the matrix-reinforcement interface. These stresses are transferred to the neighbouring regions, leading to post-elastic behaviour and failure events. Finite Element results for rubber/cord composites under various boundary conditions highlight the discrepancies in mechanical behaviour between the proposed model and standard approaches in the literature, while experimental tests performed on composite rubber pads confirm theoretical predictions, providing qualitative evidence of crack initiation.

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On the optimal design of manufacturing-induced residual stresses in filament wound carbon fiber composite cylindrical shells reinforced with carbon nanotubes

Cited by 28 publications

References 47 publications

Residual Stress in Engineering Materials: A Review

Residual Stress in Engineering Materials: A Review

The Mechanical Investigation of Filament-Wound CFRP Structures Subjected to Different Cooling Rates in Terms of Compressive Loading and Residual Stresses—An Experimental Approach

Unveiling a new shear stress transfer mechanism in composites with helically wound hierarchical fibres

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