The tan delta curves of two composites are plotted as a function of frequency as shown...

  

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The tan delta curves of two composites are plotted as a function of frequency as shown in Fig. 2c. Which composite will show higher impact strength at 25 °C and why? 0.04 99 Tan 6 0.03 25°C composi composite 1 composite 2 0.02 0.01 0.001 0.01 0.1 1 10 100 Frequency (Hz) A nylon bolt of diameter 8 mm is used to join two rigid plates (Figure 2d). The nylon can be assumed to be linear viscoelastic with a tensile stress relaxation modulus approximated by E=5 exp [-(t)1/3] GPa where t is in hours. The bolt is tightened quickly so that the initial tensile force in the bolt (at t = 0) is 1 kN. i) Find the strain in the bolt, stating any assumption made. ii) Find the tensile force remaining in the bolt after 24 hours. The tan delta curves of two composites are plotted as a function of frequency as shown in Fig. 2c. Which composite will show higher impact strength at 25 °C and why? 0.04 99 Tan 6 0.03 25°C composi composite 1 composite 2 0.02 0.01 0.001 0.01 0.1 1 10 100 Frequency (Hz) A nylon bolt of diameter 8 mm is used to join two rigid plates (Figure 2d). The nylon can be assumed to be linear viscoelastic with a tensile stress relaxation modulus approximated by E=5 exp [-(t)1/3] GPa where t is in hours. The bolt is tightened quickly so that the initial tensile force in the bolt (at t = 0) is 1 kN. i) Find the strain in the bolt, stating any assumption made. ii) Find the tensile force remaining in the bolt after 24 hours.

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