Curing and seawater aging effects on mechanical and physical properties of glass/epoxy filament wound cylinders

Antunes, Marcelo Barbieri; Almeida, José Humberto S.; Amico, Sandro Campos

doi:10.1016/j.coco.2020.100517

Cited by 24 publications

(5 citation statements)

References 18 publications

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“…By using the 2-level Taguchi approach available in Minitab statistical software, a virtual test is designed with an orthogonal array L4, that is, two levels and two factors. 35 The Taguchi response is presented in equation (1), where the variation of random parameters from its mean μ to μ + 3σ, the relative change to its deterministic value can be provided. This determines sources of uncertainties with a significant impact on scattering the Taguchi response and can be used for screening purposes to reduce the number of parameters in the UQ.…”

Section: Taguchi-based Screening and Sensitivity Analysismentioning

confidence: 99%

“…Due to the well-known advantages and unique characteristics of composite materials, filament-wound cylindrical shells are increasingly being utilised as load-bearing parts in numerous fields, such as aeronautical, aerospace, energy, and marine structures. 1,2 Fibre-reinforced composites usually have complex microstructures, and their manufacturing processes are not trivial, making them susceptible to variations in their microstructure, geometry, and material properties. These variations can be interpreted as uncertainties, which may be the cause of variation in their mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

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Efficient strategies for reliability analysis and uncertainty quantification for filament-wound cylinders under internal pressure

Azizian

Almeida

2023

Journal of Composite Materials

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Induced uncertainties during the filament winding process may cause a significant stochastic variation in the mechanical behaviour of composite shells. This paper aims to develop a novel and deep uncertainty quantification (UQ), sensitivity and reliability analyses of filament wound shells considering manufacturing uncertainties. Firstly, a progressive damage analysis is performed to estimate their deterministic burst pressure. Then, a signal-to-noise (SNR) approach is employed using the Taguchi method for sensitivity analysis and screening uncertainties arising from manufacturing. Initial results reveal that the shells are more sensitive to thickness uncertainties for thinner structures. Then, probabilistic and reliability analyses are carried out using the Boosted Decision Trees Regression (BDTR) approach from machine learning algorithms. Despite the complexity and non-linear relationships in the problem, the developed BDTR-based metamodel shows powerful predictive performance. A comparative study shows that ply thickness uncertainty leads to a significant underestimation of failure probability. For expensive and time-consuming models in that only a few runs can be affordable, a modified approximation method for reliability analysis is proposed. Results indicate a high capability at estimating failure probability with high accuracy.

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Section: Taguchi-based Screening and Sensitivity Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Efficient strategies for reliability analysis and uncertainty quantification for filament-wound cylinders under internal pressure

Azizian

Almeida

2023

Journal of Composite Materials

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“…An alternative method to solve this mismatch problem is trimming, which is not easy to apply to these high-stiffness composite materials and may also cause the growth of the production cost, delivery time, and material waste. Furthermore, the residual stresses of the distorted part may lead to delamination, fiber waviness, matrix cracking, and wrinkling [ 9 , 10 , 11 , 12 , 13 ]. Therefore, it is always desired to minimize the shape distortion of the final part.…”

Section: Introductionmentioning

confidence: 99%

An Overview of Angle Deviations of Fiber-Reinforced Polymer Composite Angular Laminates

Hwang

2023

Materials

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After manufacturing, fiber-reinforced polymer composite laminates may have residual stresses, resulting in warpage in flat structures and angle changes in angular sections. These shape distortions may cause fitting mismatch problems under high-level assembly, and extra efforts to fix these problems may be needed. The present paper only makes an overview of the angle deviation of angular composite laminates made of either thermoset matrix with autoclave curing or thermoplastic matrix with thermoforming. Depending on the positive or negative angle deviation, spring-back or spring-in behavior is observed. There are many parameters, including intrinsic and extrinsic parameters, that could affect the angle deviation. In the first part of this review paper, experimental results concerning the effects of the part angle, part thickness, lay-up sequence, corner angle, flange size, tool material, tool surface, and cure cycle are summarized. Spring-in angles are generally obtained in this part. In the second part, several prediction methods, such as simple equations and finite element methods, are compared to indicate the considered parameters. Some have good agreement and some have larger errors. The crucial differences may be dependent on the micromechanical theories and the input properties of the composite and the constituents.

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“…Moreover, the angular orientation led to significant anisotropic behavior in terms of fracture toughness of single edge notch samples. The effect of seawater aging and curing on similar polymer-composite cylinders used as the marine structure was evaluated [ 16 ]. Completely cured composite cylinders had significant mechanical properties compared with partially cured ones.…”

Section: Introductionmentioning

confidence: 99%

Stress Distribution and Fracture Toughness of Underground Reinforced Plastic Pipe Composite

et al. 2021

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Reinforced composite materials have many applications in the aerospace, marine, and petroleum industries. Glass fiber-reinforced pipes are of considerable importance as pressurized vessels, infrastructure materials, and petroleum wastewater pipelines. The stress intensity factor due to through-thickness discontinuities is a major parameter in fracture mechanics to understand the failure mechanisms in glass fiber-composite pipes. The stress intensity factor is calculated for a composite cylinder subjected to internal pressure using the linear extended finite element method based on the law of energy release evaluation of surface damage. The analytical model needs two material properties; they are the tensile strength and the fracture toughness; therefore, a standard tensile test was carried out on a standard specimen taken from the pipe’s wall thickness. Moreover, the compact tension test specimen was manufactured from the pipe’s wall thickness to obtain the fracture toughness. The average tensile strength was measured as 21.5 MPa with a standard deviation of 5.59 MPa, moreover, the average Young’s modulus was measured as 32.75 GPa with a standard deviation of 6.64 GPa. The fracture toughness was measured as 2322 (MPa √m) with a standard deviation of 142.5 (MPa √m), whereas the average surface release energy (GIC) was 153.6 kJ/m2 with a standard deviation of 22.53 kJ/m2. A valuable design equation was extracted from the finite element model to measure the effect of cracks on the hoop stress of the cylinder wall thickness based on a nonlinear model. Moreover, an acceptable equation was used to calculate the correction and shape factor of a cylinder with movable and unmovable through-thickness cracks. This study provides useful tools and guidance for the design and analysis of composite cylinders.

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Curing and seawater aging effects on mechanical and physical properties of glass/epoxy filament wound cylinders

Cited by 24 publications

References 18 publications

Efficient strategies for reliability analysis and uncertainty quantification for filament-wound cylinders under internal pressure

Efficient strategies for reliability analysis and uncertainty quantification for filament-wound cylinders under internal pressure

An Overview of Angle Deviations of Fiber-Reinforced Polymer Composite Angular Laminates

Stress Distribution and Fracture Toughness of Underground Reinforced Plastic Pipe Composite

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