Effects of moisture and thermal ageing on structural stability of sandwich panels

Morganti, F.; Marchetti, M.; Reibaldi, Giuseppe

doi:10.1016/0094-5765(84)90089-4

Cited by 8 publications

(6 citation statements)

References 11 publications

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“…A superior behavior of the is0 is then observed as its residual properties remains twice those of the ortho: the is0 durability can be considered to be twice as long: also, the relative residual properties can be considered good as they are -70% of the initial state after 5000 h and -80% of the properties could be recovered since the plasticization of the resin with water is reversible after drying (18). However, some authors (19) believe that the phenomenon of plasticization is chemically reversible but produces permanent effects on the mechanical behavior of a composite. So this information must be taken into account to predict the durability.…”

Section: Evolution Of the Ultimate Stressesmentioning

confidence: 99%

Effects of water absorption and osmotic degradation on long‐term behavior of glass fiber reinforced polyester

Castaing

Lemoine

1995

Polymer Composites

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Glass fiber reinforced polyester composites, with gelcoat, are widely used as structural materials for hulls, pools, pipes, and tanks in aggressive environments, despite the lack of knowledge concerning their resistance to water in the long term. In addition, these materials may be damaged through an osmotic process, especially when immersed in water, as are boat hulls, and this phenomenon can lead to a delamination of the gelcoat and of the laminate plies. The aim of this experimental study is to evaluate the mechanical characteristics with time of orthotropic laminates subjected to accelerated tests of humid aging. The evolution of the properties with water absorption is followed by a nondestructive test procedure based on vibrational mode analysis. The results are additionally confirmed by quasi-static bending and shear tests. It is shown that the main effects of water on the composite mechanical properties are the plasticization of the matrix a n the osmotic delamination of the plies: on the other hand, gelcoat blistering had no influence on the durability. This paper highlights the need for and the complementarity of both nondestructive and destructive mechanical tests for studying the long-term behavior of composites in marine environments. POLYMER COMPOSITES, OCTOBER 1995, Yo/. IS, No. 5

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Section: Evolution Of the Ultimate Stressesmentioning

confidence: 99%

Effects of water absorption and osmotic degradation on long‐term behavior of glass fiber reinforced polyester

Castaing

Lemoine

1995

Polymer Composites

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“…23 It was observed that moisture absorption was higher in PMI foam core sandwich structures than honeycomb core sandwich composites. Morganti et al 24 have also analyzed the effect of moisture on the dimensional stability of sandwich composites. It was concluded that moisture and temperature affect the physical behavior of the composite directly by modifying its structural characteristics such as degrading the matrix elastic properties and inducing microcracks between fibres and matrix.…”

Section: Introductionmentioning

confidence: 99%

Moisture absorption and mechanical degradation studies of polyurethane foam cored E-glass-reinforced vinyl-ester sandwich composites

Manujesh

Rao

Aan³

2013

Journal of Reinforced Plastics and Composites

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The present paper explores the experimental observations and result of hygrothermic aging of polyurethane foam cored E-glass reinforced vinyl-ester sandwich composites for a long duration of time under salt fog exposure. Four types of sandwich specimens were used for the study. Polyurethane foam cored E-glass mat (woven roving, chopped strand mat, chopped strand stitched mat and stitch bond mat) type reinforcement in vinyl-ester sandwich composites were prepared by manual hand layup method using compression technique. The prepared specimens were tested for moisture up-take behavior and the resulting property degradation in terms of flexural strength, flatwise and edgewise compression strength. The mechanical properties under the salt fog exposure with 95% RH using artificial sea water fogging were monitored for 180 days. The specimens showed reduced strength in terms of core shear and facing bending strength, edgewise and flatwise compressive strength. Scanning electron micrograph of the fracture specimens show face sheet/core debonding.

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“…Several other studies also observed that the polymeric foam core degrades after a long‐time exposure to fluid, see for example Avilés and Aguilar‐Montero and Manujesh et al . Morganti et al studied the effects of moisture on sandwich composites and reported that fluid diffusion degraded the matrix elastic properties and induced microcracks between fibers and matrix. To predict the lifetime performance of sandwich composites, it is necessary to understand the fluid diffusion process in sandwich composites.…”

Section: Introductionmentioning

confidence: 96%

Multi‐scale analysis of diffusion of fluid in sandwich composites

et al. 2019

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This study presents a multiscale analysis for describing the fluid diffusion in polymeric sandwich composites, comprising of glass-epoxy fiber reinforced polymer (FRP) skins and polyurethane foam core. The multiscale framework includes the unit-cell micromechanics model for determining the overall diffusion behavior in the FRP skins by incorporating different diffusivities of the fiber and matrix and the diffusion model for foam core. In addition, multiscale diffusion tests have been conducted for the sandwich composites, FRP skins, foam core, and epoxy resin. The specimens were immersed in deionized water at 50 C. The capability in predicting the overall diffusion behavior of sandwich composites while recognizing the different diffusion processes of the constituents is not only beneficial for designing polymeric sandwich composites with desired performance but also enhances understanding on the durability of polymeric sandwich composites. POLYM. COMPOS., 40:3520-3532, 2019.

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Effects of moisture and thermal ageing on structural stability of sandwich panels

Cited by 8 publications

References 11 publications

Effects of water absorption and osmotic degradation on long‐term behavior of glass fiber reinforced polyester

Effects of water absorption and osmotic degradation on long‐term behavior of glass fiber reinforced polyester

Moisture absorption and mechanical degradation studies of polyurethane foam cored E-glass-reinforced vinyl-ester sandwich composites

Multi‐scale analysis of diffusion of fluid in sandwich composites

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