PSI - Issue 47

Rachid Bensaada et al. / Procedia Structural Integrity 47 (2023) 503–512 R. Bensaada et al. / Structural Integrity Procedia 00 (2019) 000 – 000

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states. This step is of paramount importance to assess the gain obtained by hybridization of the material and the results obtained could constitute a benchmark for the identification of numerical models.

2. Material and methods 2.1 Manufacturing process

Tensylon® is provided by the DuPont© research center in Switzerland as 500 mm² plates. The material is manufactured as 1.6m wide double layered bi-directional criss-cross tape with a total length of approximately 300m. These laminates resulted from pressing of several cut-to-size layers at 15.2 MPa at 120°C. Each layer consists in unidirectionally oriented filaments and about 20% adhesive matrix (Alil et al. 2018). More information concerning the manufacturing process are provided by (Russell et al. 2013). 2.2 Mechanical characterization Mechanical characterization is required in order to bring input data for modelling and to assess the relevance of key parameters of the pressing process. In the present study, only the quasi-static characterization of the interlaminar bond is assessed. The material is provided in two stacking sequences: [0/90] 20 and [±45] 20 . The results obtained under tensile testing at velocity of 0.1 mm/min are given respectively by Fig. 1a) and b) for Tensylon® [0/90] 20 and [±45] 20 .

b)

a)

Fig. 1. Stress/strain tensile response of Tensylon® under v=0.1 mm/min a) [0/90] 20 b) [±45] 20

2.3 Substrate and adhesive selection and surface treatments 2.3.1 Modified Arcan device

The Arcan device is constituted of two half-moon shaped parts of high stiffness steel. The assembly (substrate + specimen to characterize) is gipped in the two parts (Fig. 2a). The complete device is placed within hydraulic testing machine. The type of loading is chosen by fixing the angle between the machine axis and the normal axis of the assembly (Fig. 2b). To determine the envelope of the material, three different loadings were applied thanks to the angle: tensile loading with and angle of 0°, shear loading at 90° and proportional tensile shear loading with 22.5° and 45°.