MSE_2610_HW_3 - MSE 2610 Introduction to the Mechanical...

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Introduction to the Mechanical Properties of Materials Fall 2008 Homework Assignment #3 Due: 26 September 2008 1.) The modulus of a lightly cross-linked elastomer is plotted against temperature. Temperature (K) Modulus (MPa) A B C D For each area A-D, explain how the polymer chains interact with one another and result in the relative modulus shown in the graph. 2.) From certain tests on a polymer at room temperature, it is found that the polymer has a coiling time of 30 s. Is the polymer below, above, or at the glass transition temperature? 3.) A compressive stress of 330 kPa is applied instantaneously at t = 0 s to the spring and dashpot model shown below. The spring constant is 100 MPa. The viscosity 2x10 5 Pa·s. a.) What are the stresses and the strains in the spring and the dashpot at t = 0 for both Model 1 and Model 2? b.) What are the stresses and the strains in the spring and the dashpot after 10 s for both Model 1 and Model 2? c.) Derive a differential expression to relate the strain to time in both models
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This note was uploaded on 12/24/2008 for the course MSE 261 taught by Professor Sass during the Fall '06 term at Cornell University (Engineering School).

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MSE_2610_HW_3 - MSE 2610 Introduction to the Mechanical...

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