2. (15 pts) You and a few others find yourselves on a remote island and you need to leave quickly. A part of the design of your escape craft involves using the glass-reinforced nylon fastener shown below to clamp together two plates; this applies a constant strain on the fastener.Service life will demand a tensile stress of at least 3,000 psi during use. Assume that the fastener can be modeled as a Maxwell solid, with E= 6x106 psi and n = 600x106 psi-min. If the maximum allowable initial stress in the fastener is 75,000 psi, how long a service life is possible? Plot the stress-time curve showing the qualitative behavior of the material.

Fig: 1

Fig: 2

Fig: 3