Hygrothermal aging effects on mechanical and fatigue behaviors of a short- natural-fiber-reinforced composite

Mejri, M.; Toubal, Lotfi; Cuillière, Jean-Christophe; Vincent, François

doi:10.1016/j.ijfatigue.2017.11.004

Cited by 49 publications

(28 citation statements)

References 37 publications

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“…It is revealed from these figures that, for the two composite materials, the stiffness degradation appears to follow three distinct stages (Figure 5). 28–32 i. An initial rapid decrease in stiffness degradation ( F max / F 0max ) appears during the first 100 cycles.…”

Section: Resultsmentioning

confidence: 99%

The effects of water ageing on the tensile static and fatigue behaviors of greenpoxy–flax fiber composites

Malloum

Mahi

Idriss

2019

Journal of Composite Materials

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This work presents the experimental results of the effect of water ageing in flax fibers reinforced greenpoxy resin matrix composite materials. The experimental study was carried out on two cross-ply laminates ([0/90]s and [+45/−45]s). First, the water uptake of the two composite materials was studied. Second, the mechanical properties were identified as a function of the immersion time. The results obtained show that the Young's modulus of composites decreases progressively to 26% for [0/90]s specimens and 46.36% for [+45/−45]s specimens after 30 days of ageing. Finally, the effects of interactions between water ageing and cyclic fatigue behavior were studied. We consider stiffness loss, hysteresis curves, energy dissipation and loss factor versus number of cycles as a function of different immersions time. A significant decrease in the mechanical characteristics of the composites as a function of the immersion time is observed. [+45/−45]s specimens are more sensitive to both fatigue and water ageing phenomena.

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Section: Resultsmentioning

confidence: 99%

The effects of water ageing on the tensile static and fatigue behaviors of greenpoxy–flax fiber composites

Malloum

Mahi

Idriss

2019

Journal of Composite Materials

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“…When the materials were exposed to moisture (aging), they became more ductile, which increased their toughness (ZIVKOVIC et al, 2017). As reported by Mejri et al (2018), limited water absorption may increase mobility of the polymeric chain and result in increased impact strength.…”

Section: Influence Of Natural Aging On Mechanical Propertiesmentioning

confidence: 89%

Analysis and targeting of waste paper/polyester composites after weathering

Porto¹,

Angrizani²,

Calegari³

et al. 2019

Product (São Carlos, Online)

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This paper focuses on the investigation of degradation effects from the environment on waste paper/polyester composites. The materials were analyzed according to visual aspects, mass gain and mechanical properties. The composites subjected to aging were influenced by moisture absorption from the particles, with a deleterious effect also on particle/matrix interface, decreasing tensile and flexural strength of the composite. This same phenomenon lead to a positive effect on impact strength and reduction in hardness of the composites, since moisture absorption was limited and the material became slightly tougher. Moisture absorption also caused an increase in elastic modulus of the matrix. Based on all results, the developed material was found not suitable for external use.

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“…Referring to the Fig 12, the data shows there is different between lap shear strength of conductive ink sample when subjected to room temperature and hygrothermal aging condition. The shear strength shows a decrease from 0.1816 ± 0.0230 MPa for room temperature to 0.0108 ± 0.0032 MPa for hygrothermal aging, that is almost 8 fold due to moisture attact when exposed to hygrothermal aging which humidity and temperature is extreme high [15]. Otherwise, the decrease of the this due to the week surface energy, brittle behavior and the week bonding between the black carbon filled conductive ink molecules and the aluminium substrate at the joint [16]- [18].…”

Section: Mechanical Characterizationmentioning

confidence: 95%

Reliability Performance of Conductive Ink Subjected to Hygrothermal Aging

Zainal,

Buyamin,

Fadzulllah

et al. 2019

IJEAT

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In the era of rapid technological development, the popularity in printed technologies and electronic packaging have resulted in a tremendous increase in the use of carbon-based conductive ink due to their advantageous features such as being environmental-friendly, low cost and lower assembly temperature. From the literature, it has been highlighted that the interconnect material are exposed to some degree of humidity and elevated temperature during the service life in an actual application. Todate, there is not yet a great length of literature reporting on the reliability performance of such materials when exposed to hygrothermal aging. Therefore, the objective of this research work is to investigate the reliability performance of the conductive ink when subjected to hygrothermal aging. In this study, the samples were exposed to either the room temperature condition with temperature of 20°C and humidity of 60% RH and secondly when subjected to hygrothermal aging in an environmental chamber with humidity of 85% RH and a temperature of 85°C up to 24 hours. Following these, the samples were tested in terms of electrical conductivity using a four-point-probe (ASTM F390) and lap shear test (ASTM D1002) via tensile loading to evaluate the bonding strength at the interface between the adhesive and the substrate. Next, morphological study was done using Scanning Electron Microscopy (SEM). With the presence of water molecule in the conductive ink, the molecule of carbon black and epoxy become unstructured and traces of riverlines are evident. In addition, there is a dramatic decrease in the sheet resistance following hygrothermal aging relative to the samples conditioned at room temperature, possibly due to enhancement in the conductivity of the ink. In contrast, as for the mechanical shear stress, the lap shear stress following hygrothermal aging process becomes weaken compared to those conditioned at room temperature, which could be associated with weak surface energy, brittle and weak bonding between carbon black molecules and the aluminium substrate interface.

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Hygrothermal aging effects on mechanical and fatigue behaviors of a short- natural-fiber-reinforced composite

Cited by 49 publications

References 37 publications

The effects of water ageing on the tensile static and fatigue behaviors of greenpoxy–flax fiber composites

The effects of water ageing on the tensile static and fatigue behaviors of greenpoxy–flax fiber composites

Analysis and targeting of waste paper/polyester composites after weathering

Reliability Performance of Conductive Ink Subjected to Hygrothermal Aging

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