Experimental study of non conventional interfaces with trapezoidal patterns.

Abstract

In the present investigation, double cantilever beam (DCB) specimens manufactured using 3D printing (ALM) are investigated from an experimental point of view. The influence of the aspect ratio A/λ (A = amplitude, λ = wavelength) in the fracture toughness of non-conventional interfaces is analysed, specifically for trapezoidal profiles. The particular geometry of the interface herein considered corresponds to that with the greatest ratio A/λ using the current technical capabilities of ALM (Additive Layer Manufacturing) devices. In the first part of the investigation, a preliminary analysis comprising the assessment of the applicability of different materials, which are supported by the 3D printer (nailon and glass-fiber-reinforced polymer composites), are shown in the manufacturing section. This first part of the study is analysed from different points of view: from non-conventional interfaces manufacturing of different typologies (to determine the printer accuracy) to the actual specimen manufacturing. In the laboratory test section, the set-up of the test and specimens before the laboratory test are described. The fracture toughness of conventional and structured interfaces, in particular with trapezoidal profiles, are compared.

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