Effect of hygrothermal aging on static behavior of quasi-isotropic CFRP composite laminate

Behera, Alok; Vishwakarma, Ashok; Thawre, Manjusha M.; Ballal, Atul

doi:10.1016/j.coco.2019.11.009

Cited by 47 publications

(36 citation statements)

References 22 publications

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“…In summary, the water absorption test results of pure resin and composite foam materials are consistent with the trend of water absorption rate of pure resin, 41 fiber-reinforced composite materials, 42 and composite foam materials 43 reported in literature, and are all rapid water absorption in the early stage and rising slowly in the later stage.…”

Section: Resultssupporting

confidence: 89%

Effects of silane coupling agent modifications of hollow glass microspheres on syntactic foams with epoxy matrix

Fan

Wang

et al. 2021

Polymers and Polymer Composites

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A syntactic foam was prepared from an epoxy resin matrix and modified hollow glass microsphere fillers. Modification by silane coupling agents with different molecular structures was analyzed, and the optimal content of the silane coupling agent was determined. The results demonstrated that all silane coupling agents enhanced the adhesion between the hollow glass microspheres and epoxy resin matrix, resulting in enhanced water absorption, compressive performance, tensile performance, and bending performance compared to those prepared using unmodified hollow glass microspheres. Among silane coupling agents with different end groups, the one with a sulfhydryl end group exhibited optimal modification for hollow glass microspheres. Among the silane coupling agents with different backbone structures, the one with silanol groups exhibited the optimal modification of hollow glass microspheres. Additionally, the performance of the syntactic foams was optimal when 6% of the silanol-containing coupling agent was used. The results demonstrated that syntactic foams prepared with hollow glass microspheres modified by silane coupling agents exhibited improvements in water absorption, compressive performance, tensile performance, and bending performance, compared with those prepared using unmodified hollow glass microspheres. Among silane coupling agents with different end structures, the one with a sulfhydryl group as end group showed the best modification effect on hollow glass microspheres. The water absorption was 0.35%, the compressive strength was 62.15 MPa, the tensile strength was 40.15 MPa, and the bending strength was 53.17 MPa. Among silane coupling agents with different backbone structures, the one with silanol groupsbonds showed the best results. Its compressive strength was up to 64.15 MPa, the tensile strength was 35.47 MPa, and the bending strength was 53.99 MPa.

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Section: Resultssupporting

confidence: 89%

Effects of silane coupling agent modifications of hollow glass microspheres on syntactic foams with epoxy matrix

Fan

Wang

et al. 2021

Polymers and Polymer Composites

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“…Another important finding was that the hygral stresses occur even at the beginning of the immersion, and they occur mainly at the edges. Reference [8] studied also the effect of hygrothermal aging, but on the static properties of the material. The tests were performed at room temperature and at high temperature at 70°C.…”

Section: Introductionmentioning

confidence: 99%

Seawater absorption properties and equilibrium for carbon fiber reinforced epoxy autonomous underwater vehicle hull at 1000m depth

Elkolali¹,

Al-Tawil²,

Alcocer³

2022

Preprint

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The hull of an Autonomous Underwater Vehicle (AUV) is one of the main factors that determine its overall compressibility and drag. The hull as well, acting as a pressure vessel, is the most essential part that will allow the vehicle to accomplish deep diving. In order to minimize the total weight and volume of the vehicle, many modern vehicles benefit from composite materials rather than conventional materials. Moisture absorption, known as the hygral effect, has a significant impact on the mechanical properties of the material. Not to mention it also has an effect on the buoyancy of the vehicle, since the overall weight changes. This paper characterizes the seawater absorption and diffusivity of Carbon Fiber Reinforced Epoxy (CFRE) pressure hull samples in ambient conditions at sea level and at 1000m depth. The tests were performed using seawater taken from Oslo fjord in Norway and using a pressure vessel. Twelve specimens, all manufactured from CFRE using filament winding technique, were tested in both conditions, and the moisture absorption curve is compared. Periodic gravimetric measurements were taken, where the equilibrium state was reached after approximately 65 days at sea level and after 35 days at 1000m depth. The results showed that moisture diffusivity for composites used in underwater applications should be defined by both pressure and temperature since it changes with respect to submersion depth.

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“…As one of the most common reasons for material breaking down, fatigue failure needs to be investigated as a vital property in the design of composites subjected to cyclic loads [17]. Although there are some studies on the use of composites in adverse conditions, the durability of CFRP composites exposed to moisture or wet conditions needs further research to make them applicable to external applications with limited monitoring or inspection [18].…”

Section: Introductionmentioning

confidence: 99%

Seawater Effect on Fatigue Behaviour of Notched Carbon/Epoxy Laminates

et al. 2021

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This paper studies the effect of seawater immersion on the fatigue behavior of notched carbon/epoxy laminates. Rectangular cross-section specimens with a central hole were immersed in natural and artificial seawater for different immersion times (0, 30 and 60 days), being the water absorption rate evaluated over time. After that, fatigue tests were performed under uniaxial cyclic loading using a stress ratio equal to 0.1. After the tests, the optical microscopy technique allowed the examination of the failure micro-mechanisms at the fracture surfaces. The results showed that saturation appeared before 30 days of immersion and that water absorption rates were similar for natural and artificial seawater. The S–N curves showed that the seawater immersion affects the fatigue strength, but there were no relevant effects associated with the type of seawater. Moreover, it was also clear that fatigue life was similar for long lives, close to 1 million cycles, regardless of the immersion time or the type of seawater. On the contrary, for short lives, near 10 thousand cycles, the stress amplitude of dry laminates was 1.2 higher than those immersed in seawater. The failure mechanisms were similar for all conditions, evidencing the fracture of axially aligned fibres and longitudinal delamination between layers.

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Effect of hygrothermal aging on static behavior of quasi-isotropic CFRP composite laminate

Cited by 47 publications

References 22 publications

Effects of silane coupling agent modifications of hollow glass microspheres on syntactic foams with epoxy matrix

Effects of silane coupling agent modifications of hollow glass microspheres on syntactic foams with epoxy matrix

Seawater absorption properties and equilibrium for carbon fiber reinforced epoxy autonomous underwater vehicle hull at 1000m depth

Seawater Effect on Fatigue Behaviour of Notched Carbon/Epoxy Laminates

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