Studying residual strains in ring-shaped specimens made of polymer composite materials with unidirectional structure

Sergeev, A. Yu.; Baurova, N. I.

doi:10.1134/s1995421215040127

Cited by 4 publications

(1 citation statement)

References 2 publications

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“…WAIR samples tended to open from the incision after cutting (Figure 7(b) and (d)), while WART samples tended to close from the incision (Figure 7(a) and (c)). The reasons for this phenomenon are complex and some similar opening and closing fracture morphologies of winding parts have been reported by Schlottermu ¨ller et al 42 and Akbari et al 43 Sergeyev AY et al 44,45 tried to provide some explanations from the perspective of mandrel and resin curing. In this paper, it is considered that the prestress formation in composite parts is closely related to the fiber tension, the deformation of the liner, and the resin cross-linking.…”

Section: Residual Stress Accumulationmentioning

confidence: 65%

Influence of resin curing cycle on the deformation of filament wound composites by in situ strain monitoring

Chen

Huan

et al. 2021

High Performance Polymers

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The residual stress of metal liners wrapped by composite materials has a significant influence on the service performance of rotating parts, such as flywheel rotors and motor jackets. However, the deformation of the liners, the flow of resins, and the temperature variation during the winding process make it difficult to predict and control this residual stress. In this paper, the process-induced strains were monitored online by a strain gauge with the help of a wireless strain meter. The evolution of this strain during the manufacturing process was fully discussed. A rapid curing resin system was used and its curing properties were tested by differential scanning calorimetry. The mechanical properties of the resin matrix and its composite were characterized. The effect of the curing cycle on the evolution of the residual strain was discussed in detail through comparative experiments. The experimental results show that the use of infrared radiation has a significant advantage regarding residual stress accumulation. This advantage is greater when carbon fiber is used than when glass fiber is used. The prestress in composites of glass fiber and carbon fiber increases by 5.9% and 41.7%, respectively, after cooling.

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