Characterisation of Moisture Absorption Effects on the Strength of Composite Materials

Wong, King Jye; Israr, Haris Ahmad; Tamin, Mohd Nasir

doi:10.4028/www.scientific.net/amr.1125.69

Cited by 11 publications

(11 citation statements)

References 10 publications

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“…5, it was noticed that all properties (strength, energy, and stiffness) degraded with the increase in moisture content. This was consistent with the general observation and all data was hence fitted using the residual property model (RPM) proposed previously by Wong et al [16]. Results showed a good fit for the different properties considered.…”

Section: Effects Of Quasi-static Loading On Adhesive Joint Under Moissupporting

confidence: 90%

“…In order to characterize the variation of mechanical properties of the adhesive joints tested due to moisture absorption, the residual property model (RPM) proposed by Wong et al [16] is adopted. RPM describes that the normalized residual property can be predicted using the following equation:…”

Section: Effects Of Quasi-static Loading On Adhesive Joint Under Moismentioning

confidence: 99%

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Non-Fickian Absorption Characteristics of Adhesive Joints: Capillary Effects and Residual Properties

Johar

Wong

Tamin

2018

IJIE

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Mechanical performance of polymer-based adhesive joints is generally susceptible to moisture absorption. This study quantifies the effects of moisture content on the strength, stiffness, and energy properties of adhesive bonded joints. For this purpose, moisture absorption characteristics of structural adhesive joints (Araldite 2015) with different thicknesses (0.5, 1.0, and 1.5 mm) were firstly established under accelerated aging condition (deionized water at 60 o C). A thickness-dependent non-Fickian moisture absorption model was then used to characterize the moisture absorption of the adhesive joints. Results suggested that the moisture absorption of the adhesive joints was governed by the capillary action. Subsequently, adhesive joints with aluminum 6061 adherent and 0.5 mm-thick Araldite 2015 adhesive compound were subjected to dry, 0.1, 0.15, 0.18, and 0.2 pct of moisture content. The specimens were tested in shear and tension loadings at 1 mm/min. The resulting variations in the mechanical properties were fitted using a residual property model. It was noticed that all properties degraded upon moisture attack. For strength and energy properties, the degradation was more severe in tension. As for the stiffness, the decrease in the property was similar in both tensile and shear. The results from this study showed that moisture attack is an important aspect to be considered when designing for the service lifetime of adhesive bonded structures.

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Section: Effects Of Quasi-static Loading On Adhesive Joint Under Moissupporting

confidence: 90%

Section: Effects Of Quasi-static Loading On Adhesive Joint Under Moismentioning

confidence: 99%

Non-Fickian Absorption Characteristics of Adhesive Joints: Capillary Effects and Residual Properties

Johar

Wong

Tamin

2018

IJIE

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“…To describe the variation of G IIC with respect to moisture content M , the following residual property model (RPM) [ 3 , 6 , 13 ] is adopted

where G IIC (M) is the residual mode II fracture toughness at particular moisture content, G IIC,dry is the dry property, G IIC,min is lowest mode II fracture toughness within the range of study, M is the moisture content, M m is the maximum moisture content, and ζ is the degradation parameter. This model assumes that the residual mode II fracture toughness is a function of moisture content only.…”

Section: Resultsmentioning

confidence: 99%

“…Nevertheless, aircraft structures are exposed to different environmental conditions throughout their service lifetime. It is commonly reported that moisture absorption could lead to the degradation in the mechanical properties of composite materials [ 3 , 4 , 5 , 6 ]. Not only that, as the external loadings in real life applications are generally induced in the lateral direction, mode II delamination could be dominant due to the interlaminar shear stress caused by the bending of the structures [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

Moisture Absorption Effects on Mode II Delamination of Carbon/Epoxy Composites

et al. 2020

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It is necessary to consider the influence of moisture damage on the interlaminar fracture toughness for composite structures that are used for outdoor applications. However, the studies on the progressive variation of the fracture toughness as a function of moisture content M (%) is rather limited. In this regard, this study focuses on the characterization of mode II delamination of carbon/epoxy composites conditioned at 70 °C/85% relative humidity (RH). End-notched flexure test is conducted for specimens aged at various moisture absorption levels. Experimental results reveal that mode II fracture toughness degrades with the moisture content, with a maximum of 23% decrement. A residual property model is used to predict the variation of the fracture toughness with the moisture content. Through numerical simulations, it is found that the approaches used to estimate the lamina and cohesive properties are suitable to obtain reliable simulation results. In addition, the damage initiation is noticed during the early loading stage; however, the complete damage is only observed when the numerical peak load is achieved. Results from the present research could serve as guidelines to predict the residual properties and simulate the mode II delamination behavior under moisture attack.

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“…When using carbon/epoxy laminated composites for aircraft applications, the materials are inevitably subjected to various environmental conditions. Upon prolonged moisture and heat attacks, the properties may degrade and lead to premature failure of the structures [ 3 , 4 , 5 , 6 , 7 ]. It is common to relate the residual properties to the absorbed moisture content of the materials [ 3 , 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

An Extended Thickness-Dependent Moisture Absorption Model for Unidirectional Carbon/Epoxy Composites

et al. 2021

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Moisture absorption tests for materials that exhibit non-Fickian behavior generally require a relatively long period to reach saturation. Therefore, it would be beneficial to establish a relationship between the moisture content and the thickness to minimize the experimental time and cost. This research characterizes the moisture absorption behavior of AS4/8552 carbon/epoxy composites. Specimens were prepared at 4, 8, and 16 plies and immersed in distilled water at 60 °C. The relationship between the non-Fickian parameters (Fickian to non-Fickian maximum moisture content ratio ϕ, non-Fickian diffusivity per square thickness α, and non-Fickian initiation time to) and thickness was characterized using a thickness-dependent model. A comparison with other materials revealed that all three non-Fickian parameters are able to be fitted using a power law. Nevertheless, the upper boundary for the applicability of this model was not determined in this study. The Weibull distribution plots indicate that the probability of non-Fickian moisture absorption is influenced by ϕ and α at approximately 62% within a normalized thickness range of 2–3. In regards to to, it is 82% at a normalized thickness of 6. Therefore, the Weibull distribution is proposed for the assessment of non-Fickian moisture absorption based on the material’s thickness.

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Characterisation of Moisture Absorption Effects on the Strength of Composite Materials

Cited by 11 publications

References 10 publications

Non-Fickian Absorption Characteristics of Adhesive Joints: Capillary Effects and Residual Properties

Non-Fickian Absorption Characteristics of Adhesive Joints: Capillary Effects and Residual Properties

Moisture Absorption Effects on Mode II Delamination of Carbon/Epoxy Composites

An Extended Thickness-Dependent Moisture Absorption Model for Unidirectional Carbon/Epoxy Composites

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