5. The Dodo clones are very thankful after your amazing rescue a few weeks ago. A sizable part of the group came out of the experience feeling like they are invincible and would now like to conquer the Earth. The Dodos (somehow) took hostage scientists and engineers including yourself and are now demanding to your group to fabricate wings for them to facilitate their world dodomination. You think of a clever ruse to incorporate a polymer that would slowly soften under stress so the wings would break down over time. a. To explain your plan to the rest of your group, draw a generalized stress strain curve for a polymer at room temperature, a cold temperature and a warm temperature. Explain why the polymer behaves differently at these temperatures and why you don't see this behaviour as much in metals and ceramics? b. Draw a strain vs time and stress vs time graphs of a polymer at room temperature. Comment on how stress and strain behave as time passes. c. The viscoelastic polymer is pulled in tension and held at a constant strain of 0.6 the moment a Dodo puts on the wings. The relaxation modulus at time zero Er(0) is 16.4MPA. The mechanism collapses once the stress through the polymer reaches 1MPA. Calculate the relaxation time required for the wings to break down
5. The Dodo clones are very thankful after your amazing rescue a few weeks ago. A sizable part of the group came out of the experience feeling like they are invincible and would now like to conquer the Earth. The Dodos (somehow) took hostage scientists and engineers including yourself and are now demanding to your group to fabricate wings for them to facilitate their world dodomination. You think of a clever ruse to incorporate a polymer that would slowly soften under stress so the wings would break down over time. a. To explain your plan to the rest of your group, draw a generalized stress strain curve for a polymer at room temperature, a cold temperature and a warm temperature. Explain why the polymer behaves differently at these temperatures and why you don't see this behaviour as much in metals and ceramics? b. Draw a strain vs time and stress vs time graphs of a polymer at room temperature. Comment on how stress and strain behave as time passes. c. The viscoelastic polymer is pulled in tension and held at a constant strain of 0.6 the moment a Dodo puts on the wings. The relaxation modulus at time zero Er(0) is 16.4MPA. The mechanism collapses once the stress through the polymer reaches 1MPA. Calculate the relaxation time required for the wings to break down
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:5. The Dodo clones are very thankful after your amazing rescue a few weeks ago. A sizable part of
the group came out of the experience feeling like they are invincible and would now like to
conquer the Earth. The Dodos (somehow) took hostage scientists and engineers including yourself
and are now demanding to your group to fabricate wings for them to facilitate their world
dodomination. You think of a clever ruse to incorporate a polymer that would slowly soften under
stress so the wings would break down over time.
a. To explain your plan to the rest of your group, draw a generalized stress strain curve for
a polymer at room temperature, a cold temperature and a warm temperature. Explain
why the polymer behaves differently at these temperatures and why you don't see this
behaviour as much in metals and ceramics?
b. Draw a strain vs time and stress vs time graphs of a polymer at room temperature.
Comment on how stress and strain behave as time passes.
c. The viscoelastic polymer is pulled in tension and held at a constant strain of 0.6 the
moment a Dodo puts on the wings. The relaxation modulus at time zero Er(0) is
16.4MPA. The mechanism collapses once the stress through the polymer reaches 1MPA.
Calculate the relaxation time required for the wings to break down after an hour
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