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.