PSI - Issue 64

Valentina Tomei et al. / Procedia Structural Integrity 64 (2024) 901–907 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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All the samples were printed following a linear path for the edge, while the inner part was printed by subsequent layers inclined to ± 45° (Figure 1). In summary, the following samples were realized: • N. 5 H_dog-bone samples ( Figure 2 a), with the sample thickness oriented orthogonally to the printing plane (Figure 1a); • N. 5 V_dog-bone sample ( Figure 2 a), with the sample thickness aligned parallel to the printing plane (Figure 1b); • N. 5 H_Ag_dog-bone samples ( Figure 2 a),, printed similarly to the H_dog-bone specimens but subjected to an Accelerated Aging test following the ISO 4892-3 (2016) standard; • N.3 H_Fh_dog-bone sample ( Figure 2 b), s , printed in the same manner as the H_dog-bone samples but using a multi-phase procedure. This process involved pausing the printing process halfway through the thickness to embed the optical fiber (without the FBG sensor) horizontally, followed by resuming the printing process (Figure 1c); • N.3 H_Fd_dog-bone specimen ( Figure 2 c), printed like the H_Fh_dog-bone samples (Figure 1c), but with the optical fiber arranged diagonally to the length of the specimen, without the FBG sensor ( Figure 2 ); • N.2 H_Fh(s)_dog-bone specimen ( Figure 2 b), printed similarly to the H_Fh_dog-bone samples, but with the optical fiber equipped with the FBG sensor positioned at the center of the specimen ( Figure 2 ). The geometry and dimensions of the samples are illustrated in Figure 2 and Table 1 , respectively. All samples were subjected to tensile test using a Universal Testing Machine, at displacement control until failure.

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b 1 b 2

(a)

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b 1 b 2

(b)

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(c) Figure 2. Geometry of the dog-bone samples: (a) dog-bone sample with (b) horizontal optical fiber and (c) diagonal optical fiber.