Effect of long-term thermal cycling and moisture on heated Fibre Metal Laminates and glass-fibre epoxy composites

Hagenbeek, Michiel; Sinke, J.

doi:10.1016/j.compstruct.2018.11.068

Cited by 7 publications

(10 citation statements)

References 17 publications

(22 reference statements)

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“…Similar trends have been observed in authors previous studies for laminates with a different method of aluminium surface preparation [12,19] and in hygrothermal conditions by da Costa [20]. Significant effects of thermal shocks on GLARE [15,[31][32][33] and CARALL [34,35] laminates were only observed after more than 10,000 thermal cycles. The lack of significant difference in interlaminar shear strength of the tested laminates results from the very low thickness of glass layers and effectively limiting degradation of the metal/composite interface.…”

Section: Static Interlaminar Shearsupporting

confidence: 89%

“…Kubit et al [44] observed a decrease in stiffness and ILSS after the thermal cycling of fibre metal laminate made of prepregs with twisted yarn and aluminium alloy 2024-T3. Also, Hagenbeek et al [31] observed a significant (in the range of 10-30%) decrease of ILSS after long-term thermal cycling of a fibre metal laminate reinforced by glass fibres. In the current research, also a similar significant decrease of stiffness and static ILSS (in the range of 7-12%) was observed in laminates with additional layers of glass fibres.…”

Section: Fatigue Lifementioning

confidence: 98%

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Short-beam shear fatigue life assessment of thermally cycled carbon–aluminium laminates with protective glass interlayers

Surowska

Dadej

Jakubczak

et al. 2021

Archiv.Civ.Mech.Eng

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Fibre metal laminates (FMLs) are attractive construction materials, especially for use in aerospace and transport facilities. Throughout their service life, thin-walled structures made of FMLs are exposed to static and dynamic loads, as well as corrosion and the unfavourable influence of environmental conditions. The paper presents an experimental analysis of the combined mechanical and environmental long-term behaviour of carbon-based fibre metal laminates and their variants with protective glass layers. The Al alloy/CFRP and Al alloy/GFRP/CFRP laminates in a 3/2 configuration were used. The tested laminates were subjected to 1500 thermal cycles with a temperature range of 130 °C. The static and fatigue interlaminar shear strengths were tested before and after thermal conditioning. It was shown that the stable stiffness reduction in the tested laminates was observed with increasing fatigue cycles, due to the progressive fatigue damage accumulation. The thermally cycled laminates feature slightly smoother stiffness loss, while a more rapid decrease was observed in thermally untreated laminates. Moreover, the fatigue life of the tested laminates subjected to thermal cycling revealed nine times fewer fatigue cycles of laminates with glass protectors after thermal cycles in comparison to the laminates not subjected to thermal cycling.

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Section: Static Interlaminar Shearsupporting

confidence: 89%

Section: Fatigue Lifementioning

confidence: 98%

Short-beam shear fatigue life assessment of thermally cycled carbon–aluminium laminates with protective glass interlayers

Surowska

Dadej

Jakubczak

et al. 2021

Archiv.Civ.Mech.Eng

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show abstract

“…In all reported test results the maximum decrease in interlaminar shear strength (ILSS) after thermal cycling was found in the first stage from 0 to 10,000 cycles (-32.9% for heated GLARE cycled between -20 and 50 • C). This initial drop in strength was followed by a recovery phase and a resumed decline after roughly 60,000 cycles [3]. No crack or voids or other visible changes were found in the optical microscope images and the drop is expected to be caused by internal stress relief.…”

Section: Introductionmentioning

confidence: 91%

“…In previously reported research the effect of thermal cycling and moisture on heated GLARE has been examined separately and in combination with each other [1,2,3]. The effect of additional static loading was however not yet considered in these investigations.…”

Section: Introductionmentioning

confidence: 99%

Effect of thermal cycling heated Fibre Metal Laminates under static load

Hagenbeek

Sinke

2019

Composite Structures

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Heated GLARE, a Fibre Metal Laminate with an integrated heater element, has been developed for de-or anti-icing systems in aircraft structures. Besides cyclic thermal loading these structures are also subjected to mechanical loading.To investigate the effect of static loading in addition to thermal cycling a series of tests have been performed on heated GLARE using a specifically designed mechanical load fixture and thermal cycling setup. Three different tensile stress levels, 150, 200 and 300 MPa, were used in combination with up to 36,000 thermal cycles between -20 and 50 • C.The effect of the combined thermo-mechanical loading was investigated by testing the interlaminar shear properties of each sample after thermal cycling.Thermal cycling under a 150 MPa static load showed much less reduction or even increase in strength compared to previously reported test results for thermal cycling only. This effect was not found for thermal cycling under the 200 and 300 MPa static load cases. On the contrary, in these cases more reduction in strength was found compared to test results after thermal cycling without static load.

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“…Müller [ 22 ] designed a thermal cycling setup to investigate the effects of thermal cycling on the material properties of GLARE and found out the interlaminar shear strength increased with the number of cycles. Hagenbeek [ 23 ] conducted experiments of long-term thermal cycling and moisture on heated fiber metal laminates and glass-fiber epoxy composites to research the durability of structure. Subsequently, Hagenbeek [ 24 ] studied the effects of thermal cycling on heated fiber metal laminates under static load.…”

Section: Introductionmentioning

confidence: 99%

Impacts of Thermal and Mechanical Cycles on Electro-Thermal Anti-Icing System of CFRP Laminates Embedding Sprayable Metal Film

Zhang

2021

Materials

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The aircraft electro-thermal anti-icing system that can guarantee flight safety may be affected by periodic heating and cyclic aerodynamic force during long-term flight missions, which seems to be a potential threat to ice protection. This paper aims to investigate the impacts of thermal and mechanical cycles on heating elements of the electro-thermal anti-icing system. Specimens were manufactured with CFRP (carbon fiber reinforced polymer) laminated composite, glass fiber prepreg and copper screen, in which sprayable metal film (SMF) was embedded as the heating element. The study focuses on electric resistance variation of SMF and functional fatigue life under the cycling load. Thermal cycling tests were carried out in an insulated chamber where the specimens were heated up to 80 °C and then cooled down to −55 °C for 1000 cycles. Mechanical cycling tests were conducted on a fatigue testing machine where the specimens were imposed on tension-compression loading for 106 cycles. Results showed that the electric resistance of SMF increased with the number of loading cycles. The resistance was increased by 20% and the heating power was decreased by 16.67% after 1000 thermal cycles. During the mechanical cycling tests, it was found that the heating element was destructed before the structural failure, which indicated that the fatigue life of function was lower than that of the structure.

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Effect of long-term thermal cycling and moisture on heated Fibre Metal Laminates and glass-fibre epoxy composites

Cited by 7 publications

References 17 publications

Short-beam shear fatigue life assessment of thermally cycled carbon–aluminium laminates with protective glass interlayers

Short-beam shear fatigue life assessment of thermally cycled carbon–aluminium laminates with protective glass interlayers

Effect of thermal cycling heated Fibre Metal Laminates under static load

Impacts of Thermal and Mechanical Cycles on Electro-Thermal Anti-Icing System of CFRP Laminates Embedding Sprayable Metal Film

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