PSI - Issue 48

Milan Travica et al. / Procedia Structural Integrity 48 (2023) 280–287 Travica et al / Structural Integrity Procedia 00 (2019) 000 – 000

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Table 1. Geometries and dimensions of PRTS specimens found in the literature for characterizing tubular materials. Literature PRTS dimensions Geometry Material [9] 105.15x4.19 mm Single Zircaloy2 [7] 60x3 mm Single AA 6061-T4 [11] 9.62x0.36 mm Double Zircaloy2 [14] 70x4 mm Single AM30-AZ31 [15] 44x1.8 mm Single AZ31B [16] 44x1.8 mm Single AZ31B [17] 60x3 mm Single AA 6061-T5 [19] 50.8x3.15 mm Single PP [20] 50.022 mm Ring plate GEP-108 glass [21] 88.9x5.5 mm Single SA-106 Gr.B [22] 148x0.7/1.5/1.7 mm Ring Toray T700s [23] 90x10 mm Double/ Ring High denisity polyethylene [24] 50x2 mm Single AA6063-O

The publication discusses the application of the Digital Image Correlation (DIC) method in testing Pipe Ring Tensile Specimens (PRTS) [7, 17, 20, 22, 24]. DIC is an optical, non-contact method that provides a comprehen-sive 3D strain and displacement field [25]. The versatility of the DIC method allows it to be used in various sec-tors, including biomedicine, biomaterials, and polymers, as it is independent of the material being studied and the item's shape [25-32]. 2. Methods The dimensions of the Pipe Ring Tensile Specimens (PRTS) were determined for a DN32 pipe (Ø42.4 x 2.8 mm), and the standard specimen's dimensions and appearance were based on the ASTM A370 standard [33]. Single PRTS types were created for the test following the recommendations [1]. A total of 5 Single PRTS were pre-pared. In preparation for the DIC method, all PRTS specimens were coated with white paint as a base color, and a stochastic pattern of black dots was sprayed onto them prior to the experiment (Fig.1).

Fig. 1. The PRTS specimens were painted with white paint as a base color, and then a stochastic pattern of black dots.

The steel PRTS was subjected to testing using a specific testing tool described in [1]. A PRTS testing tool with D blocks was designed for this purpose. Figure 2 illustrates the PRTS testing tool, which is made of X20CrMoV12-1 steel. It consists of two forks positioned in the tensile testing equipment (Fig. 2, positions 1 and 2). Two D blocks (Fig. 2, positions 3 and 4) are placed inside the PRTS (position 5) and assembled onto the tool. The D blocks represent the internal pressure in the PRTS, which is the primary load experienced by pipelines. The PRTS specimens underwent tensile testing using a Shimadzu Autograph AGS-X Series tensile testing machine (Shimadzu, Japan) with a maximum