Issue 49

A. En-najiet alii, Frattura ed Integrità Strutturale, 49 (2019) 748-762; DOI: 10.3221/IGF-ESIS.49.67

R ESULTS AND DISCUSSION

Temperature Effect on mechanical Behavior for ABS o take into account the influence of the temperature on the ABS mechanical properties, several series of tests were carried out on dumbbell specimens in a temperature range from 25°C (laboratory temperature) to 170°C, through the glass transition temperature Tg = 110°C. The variations in the ultimate stress, elastic modulus, and elongation according to the temperature are presented in Figs. 5, 6, and 7, respectively. Several features of these figures are worth noting: for example, increasing the temperature produces a decrease in the elastic modulus, a reduction in the tensile strength, and an enhancement in the elongation. T

Figure 5: Loss of ultimate stress according to temperature.

Figure 6: Loss of Young's modulus according to temperature.

We can observe the existence of two zones: zone I corresponds to a temperature that lies between the laboratory temperature Ta = 25°C and glass transition temperature Tg = 110°C. Corresponding to a rigid (glass) state, the molecules of the amorphous part are deformed (industrial zone). Zone II is above the glass temperature and corresponds to a transition state in which chain movements become possible, allowing for greater and easier deformations. The mechanical properties

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