PSI - Issue 47

3

Abderrahim Khtibari et al./ Structural Integrity Procedia 00 (2023) 000–000

A. Khtibari et al. / Procedia Structural Integrity 47 (2023) 855–862

857

Fig. 1. Dimensions of CPVC tensile specimens

Table 1. The dimension of CPVC specimens.

Symbol

Size (mm)

Lo (total length)

75 25 8

L (length of the calibrated part) R (small radius of curvature) D (initial distance between jaws) W (width of the calibrated part)

4

60 14

W0 (widths at the ends)

B (thickness)

9.40

3. Results and discussion 3.1. Temperature sensitivity on mechanical behavior

To understand the effect of temperature on the mechanical behaviour of chlorinated polyvinyl chloride (CPVC) specimens, we performed tensile tests on specimens at Temperatures ranging from -10 to 90°C and at 6.10 -4 s -1 strain rate the results obtained presented in Fig.2. From this plot bellow we can observe that the stress-strain properties of CPVC are sensitive to temperature. At lower temperatures -10,10 and 10°C, the plasticity of the material is reduced, meaning that it is less able to deform before breaking. At 25°C, the plastic deformation is significant, as it is the temperature at which the material is best able to be deformed. At higher temperatures 50, 70 and 90°C, the ductile fracture increases the breaking strain Amjadi and Fatemi (2008). From these results, some of the most important tensile properties such as yield stress and Yong’s modulus can be determined. The analysis of the effect of temperature on these parameters be presented as shown in Fig.2. The variation of yield stress with various temperature is illustrated in Fig.3. The figure shows that yield strength decreases with increasing the temperature. At low temperatures -10, 0, and 10°C, yield stress is relatively high. At room temperature, the yield stress continues to decrease as the temperature increases. At high temperatures 50, 70 and 90°C, the yield stress is lower than at lower temperatures. The values of the yield strength decrease from 59.18 to 18.5MPa (Nearby 50%) under the temperature ranging from the -10 to 90°C. This reduction can be justified by the positive impact of molecular mobility at higher temperatures, the molecules of the material become more mobile, allowing them to flow more easily under stress Heidarnezhad et al. (2020). Additionally, plastic deformation of the