Cure strain in thick CFRP laminate: optical-fiber-based distributed measurement and numerical simulation

Ito, Y.; Obo, Takafumi; Minakuchi, Shu; Takeda, Nobuo

doi:10.1080/09243046.2014.906914

Cited by 11 publications

(5 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Non-thermoelastic residual stresses, on the other side, are irreversible and the mechanisms behind them are more complex. These mechanisms can be listed as follows [ 4 – 8 ]: ( i ) the tool–part interaction, ( ii ) chemical shrinkage during polymerization, ( iii ) consolidation, ( iv ) through-thickness degree of cure or crystallinity gradients, and ( v ) fiber volume fraction gradients.…”

Section: Introductionmentioning

confidence: 99%

A Review on the Mechanical Modeling of Composite Manufacturing Processes

Baran

Çınar

Ersoy

et al. 2016

Arch Computat Methods Eng

253

168

View full text Add to dashboard Cite

The increased usage of fiber reinforced polymer composites in load bearing applications requires a detailed understanding of the process induced residual stresses and their effect on the shape distortions. This is utmost necessary in order to have more reliable composite manufacturing since the residual stresses alter the internal stress level of the composite part during the service life and the residual shape distortions may lead to not meeting the desired geometrical tolerances. The occurrence of residual stresses during the manufacturing process inherently contains diverse interactions between the involved physical phenomena mainly related to material flow, heat transfer and polymerization or crystallization. Development of numerical process models is required for virtual design and optimization of the composite manufacturing process which avoids the expensive trial-and-error based approaches. The process models as well as applications focusing on the prediction of residual stresses and shape distortions taking place in composite manufacturing are discussed in this study. The applications on both thermoset and thermoplastic based composites are reviewed in detail.

show abstract

Section: Introductionmentioning

confidence: 99%

A Review on the Mechanical Modeling of Composite Manufacturing Processes

Baran

Çınar

Ersoy

et al. 2016

Arch Computat Methods Eng

253

168

View full text Add to dashboard Cite

show abstract

“…The reduction of cure-induced strain and stress in thick laminates curing process is a main challenge to the high quality CFRP manufacturing. [36] In order to explore the effect of U-L-SRE process on the evolution of cure, cureinduced strains are measured by optical fiber sensors. Before gelation, the strain value is affected easily by the resin flow, auxiliary materials, vacuum, and other factors.…”

Section: Cure-induced Strain Of Thick Laminate During Curing Processmentioning

confidence: 99%

Layered self‐resistance electric heating to cure thick carbon fiber reinforced epoxy laminates

Zhang

Liu

et al. 2021

Polymer Composites

View full text Add to dashboard Cite

Curing of thick carbon fiber reinforced thermosetting composite laminates has been a major challenge due to the undesired through-thickness temperature gradient. In this paper, a novel layered self-resistance electric heating (L-SRE) method to cure thick laminates was proposed. The thick laminate was divided into multiple independent sub-layers, and the temperature of each sub-layer was controlled individually. The experiment's results revealed that L-SRE was able to achieve highly homogeneous temperature distribution filed throughthickness both in rapid heating and exothermic reaction stages. The maximum temperature difference of dwell stage for L-SRE process was less than 4.0 C, and the L-SRE process that had an optimized thickness of each sub-layer achieved the minimum mean temperature deviation of 2.1 C, which was 88.46% lower than that of the oven process. By using the optimized L-SRE method, the maximum value of crosslink thermal overshoot was 12.2 C (32.5 C for oven curing). Different layered temperature control strategies were explored, and the lowest energy consumption of 309.7 Wh (19.82% of oven process) was achieved by using the single-power pulsed heating. The method proposed in this paper provided a new solution for high-quality and energy-efficient curing of thick laminates.

show abstract

“…On the other hand, distribution optical fiber sensors can measure strain and temperature distribution along fiber length. B-OTDR (Brillouin Optical Time Domain Reflectometry) was used for measuring strain distribution of composite structures [14,15]. However the typical spacing resolution is a few sub-meters and then the application was limited to large-scale structures.…”

Section: Introductionmentioning

confidence: 99%

Real-Time and <i>In Situ</i> Monitoring of FRP by Rayleigh Scattering-Based Distributed Sensing

Kosaka

2020

KEM

View full text Add to dashboard Cite

In-situ monitoring method of FRP (Fiber Reinforced Plastics) by built-in sensors is a key technology for developing future and high-reliable composite structures. The Rayleigh scattering-based distributed optical fiber sensor has high spatial resolution of 1mm and good embeddability into FRP and then it can be considered that the sensor is very suitable to in-situ monitoring of FRP. In the present paper, process monitoring and damage identification of FRP were conducted. In the process monitoring, flow-front of silicon oil impregnating into glass textile during VaRTM (Vacuum-assisted Resin Transfer Molding) process was measured. Comparing to visual observation results, it appeared that the maximum slope position of strain distribution showed flow-front position. In the health monitoring, damage identification of cross-ply GFRP laminates with delamination by the attached distribution optical fiber sensors was carried on. From the results, it was found that the strain varied largely on the delaminated section and then the delamination was detectable from the surface strain distribution measured by the optical fiber sensor.

show abstract

Cure strain in thick CFRP laminate: optical-fiber-based distributed measurement and numerical simulation

Cited by 11 publications

References 17 publications

A Review on the Mechanical Modeling of Composite Manufacturing Processes

A Review on the Mechanical Modeling of Composite Manufacturing Processes

Layered self‐resistance electric heating to cure thick carbon fiber reinforced epoxy laminates

Real-Time and <i>In Situ</i> Monitoring of FRP by Rayleigh Scattering-Based Distributed Sensing

Contact Info

Product

Resources

About