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

Barbara Surowska,Konrad Dadej,Patryk Jakubczak,Jarosław Bieniaś

doi:10.1007/s43452-021-00181-y

Barbara Surowska, Konrad Dadej + Show 2 more

Open Access

https://doi.org/10.1007/s43452-021-00181-y

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Abstract

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.

Highlights

Fibre metal laminates (FMLs) are attractive construction materials, especially for use in aerospace and transport facilities
A perpendicular GFRP layer was used as an effective barrier to avoid carbon and glass fibre interpenetration, while the GFRP layers were laminated in a perpendicular direction
Fatigue tests were conducted until the stiffness of the specimen degraded below 20% of its initial value (Sini)

Summary

Introduction

Fibre metal laminates (FMLs) are attractive construction materials, especially for use in aerospace and transport facilities. The first manufactured GLARE® and CARALL® laminates became the points of reference for developing the scientific basis for designing the properties of FMLs. The first manufactured GLARE® and CARALL® laminates became the points of reference for developing the scientific basis for designing the properties of FMLs 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. In addition to typical mechanical tests, the process of designing primary and secondary structures must include corrosive, thermal and thermo-mechanical fatigue tests. The properties of fibre metal laminates depend on those of the constitutive metal and composite materials. The final properties of an FML are influenced by a

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