PSI - Issue 19

Aissa Ouballouch et al. / Procedia Structural Integrity 19 (2019) 433–441 Aissa Ouballouch et al./ Structural Integrity Procedia 00 (2019) 000 – 000

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Fig. 2. Created specimens, CAD model, dimensions in mm

2.3. Dimensional accuracy and repeatability All the 3D printed samples for both materials were meseasured and compared to created 3D model. In this study, 11 measurements for each specimen were conducted; they included the total length (TL) of the specimen, the width (W), the reduced section width (RSW) and the thickness (T). Figure 3 depicts these dimensions in detail.

Fig. 3. Dimensions specimen and locations

The measuring is ensured by means of a micrometer. The values of each dimension were averaged.

2.4. Characterization equipment , fatigue analysis and total cost Tensile tests were performed by means of a universal testing machine Zwick/Roell Z050. The specimens were held in place utilizing two grids one fixed and the other one moveable and tested at a crosshead speed of 50mm/minute within a room temperature (  23°C) as per ISO 527 standard. The machine is shown in Figure 4. For total cost, the measuring of specimen’s weight was done by means of a balance. For each specimen number (run), three samples were prepared to obtain an average value of the measured properties and characteristics such as the ultime tensile strength, real built up time and weight. In our case, the total cost equation is mainly composed by the material cost per g, fabrication cost per minute. The detailed components are illustrated in Equation 1. Total cost [MAD] = (material[g] x material cost per g [MAD]) + (built up time [min] x machine cost [MAD]) (1)

Fig. 4. View of the of the tensile machine used in this study