Creep/recovery and stress-relaxation tests applied in a standardized carbon fiber/epoxy composite: Design of experiment approach

Monticeli, Francisco Maciel; Ornaghi, Heitor Luiz; Neves, Roberta Motta; Cioffi, Maria Odila Hilário

doi:10.1177/0309324719892710

Cited by 19 publications

(13 citation statements)

References 41 publications

(66 reference statements)

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“…Qi et al (2018) studied the stress relaxation behavior of magnetorheological elastomers to improve its anti-stress relaxation property, results showed that the anti-stress relaxation property of magnetorheological elastomer is highly dependent on magnetic field and temperature. Monticeli et al (2019) carried out creep/recovery and stress-relaxation tests in a standardized carbon fiber/epoxy composites, and the result confirmed that temperature is a determinant factor to creep and stress relaxation properties. Riara et al (2013) analyzed the creep and stress relaxation behavior of cellulose reinforced lowdensity polyethylene composites at different cellulose loading and temperature, the creep performance decreased with increase in temperature and improved with cellulose loading while creep modulus decreased with increase in time and temperature.…”

Section: Introductionmentioning

confidence: 65%

Creep and Stress Relaxation Behaviour of Rice Husk Reinforced Low Density Polyethylene Composites

Nwosu‐Obieogu

Aguele

Chiemenam

et al. 2020

EUR J SUSTAIN DEV RE

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The creep and stress relaxation behavior of rice husk reinforced low density polyethylene composite was analyzed in this study. The exponential and power model were used to study the creep while the stress relaxation assessed the time required for the composites to maintain a certain strain level. The creep strain increased with increase in time, at various temperatures, with its highest creep at 70 o C while the lowest is at 30 o C, the power model provided an excellent fit than other models with a coefficient of determination of 0.9977 at 30 o C, the neat low density polyethylene had a good stress relaxation behavior with 4.95 seconds for it to decay and subsequently decreased with increase in filler concentration.

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Section: Introductionmentioning

confidence: 65%

Creep and Stress Relaxation Behaviour of Rice Husk Reinforced Low Density Polyethylene Composites

Nwosu‐Obieogu

Aguele

Chiemenam

et al. 2020

EUR J SUSTAIN DEV RE

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“…The load relaxation tests carry the advantage of revealing a multitude of strain rates compared to a single strain rate in a steady creep test [ 12 ]. The stress relaxation tests play a major role in revealing the composite materials’ viscoelastic/viscoplastic behaviors [ 40 , 41 , 42 , 43 , 44 , 45 ]. Stress relaxation tests provide the rate of decrease in stress for any state of stress that results from maintaining a constant strain during uniaxial loading.…”

Section: Materials and Experimental Methodsmentioning

confidence: 99%

Effect of Nano-Reinforcement Topologies on the Viscoelastic Performance of Carbon Nanotube/Carbon Fiber Hybrid Composites

et al. 2020

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In this investigation, multi-walled carbon nanotubes (MWCNTs) were grown over carbon fiber fabrics via a relatively nondestructive synthesis technique. The MWCNTs patches were grown into three different topologies: uniform, fine patterned and coarse patterned. Hybrid carbon fiber-reinforced polymer composites (CFRPs) were fabricated based on the patterned reinforcements. Tensile tests, dynamic mechanical thermal analyses (DMTA) and flexure load relaxation tests were carried out to investigate the effect of the patterned nano-reinforcement on the static, dynamic, glass transition, and viscoelastic performance of the hybrid composites. Results revealed that the hybrid composite based on fine-patterned topology achieved better performance over all other configurations as it exhibited about 19% improvement in both the strength and modulus over the reference composite with no MWCNTs. Additionally, the increase in glass transition for this composite was as high as 13%. The damping parameter (tan δ) was improved by 46%. The stress relaxation results underlined the importance of patterned MWCNTs in minimizing the stress decay at elevated temperatures and loading conditions. Utilizing patterned MWCNTs topology significantly reduced the stress decay percentage at the thermomechanical conditions 60 MPa and 75 °C from 16.7% to 7.8%. These improvements are attributed to both the enhanced adhesion and large interface area by placing MWCNTs and by inducing an interlocking mechanism that allows the interaction of the three constituents in load transfer, crack deflection and hindering undesired viscoelastic deformations under different thermomechanical loadings.

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“…The Findley model is widely used in the literature, due to the easy application of the model 3,36 ; however, the Weibull model can present a behavior closer to the experimental data, since the model better considers the contributions of the factors applied in the test (material, temperature, tension, and time). 38,39 To finish the statistical analysis, the surface response curve indicates the behavior of each parameter as a function of the composite type and temperature range (Figures 5 and 6). Figure 5 shows the fluctuation of Findley's parameters.…”

Section: Statistical Approachesmentioning

confidence: 99%

Statistical analysis of creep behavior in thermoset and thermoplastic composites reinforced with carbon and glass fibers

Monticeli

Reis

Neves

et al. 2020

The Journal of Strain Analysis for Engineering Design

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The thermoplastic and thermoset laminates reinforced with different fibers generate variations in the laminated composite mechanical behavior. This work aims to analyze thermoplastic and thermoset composites creep behavior with a reduced number of experiments, applying curve-fitting analytical models (Weibull and Findley) and statistical approach (ANOVA, F-test, and SRM) in order to describe creep behavior. Creep tests were carried out using a design of experiments to define parameter levels, aiming to reduce the number of the experiments, keeping reliability relevance. The temperature shows a stronger influence of creep deformation compared with the use of distinct materials. Thermoplastic matrices seem to be more sensitive to deformation, decreasing the reinforcement contribution. On the other hand, the creep resistance of the thermoset matrix conducts a significant contribution of strain behavior for the reinforcement used. The Findley model showed a temperature-dependent response. While, the Weibull-based model exhibits temperature and material-dependence, ensuring a greater sensitivity range of the parameters applied, an essential factor for a more realistic method description.

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Creep/recovery and stress-relaxation tests applied in a standardized carbon fiber/epoxy composite: Design of experiment approach

Cited by 19 publications

References 41 publications

Creep and Stress Relaxation Behaviour of Rice Husk Reinforced Low Density Polyethylene Composites

Creep and Stress Relaxation Behaviour of Rice Husk Reinforced Low Density Polyethylene Composites

Effect of Nano-Reinforcement Topologies on the Viscoelastic Performance of Carbon Nanotube/Carbon Fiber Hybrid Composites

Statistical analysis of creep behavior in thermoset and thermoplastic composites reinforced with carbon and glass fibers

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