Compare the ways in which solid, liquids and viscoelastic materials respond to an applied stress. Sketch the strain time

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Compare The Ways In Which Solid Liquids And Viscoelastic Materials Respond To An Applied Stress Sketch The Strain Time 1 (50.99 KiB) Viewed 11 times

Compare the ways in which solid, liquids and viscoelastic materials respond to an applied stress. Sketch the strain time relations for both of the Maxwell and Voigt models under a constant stress, and the stress time relations under a constant strain. (7 marks) WWW. Maxwell model Voigt model For some viscoelastic polymers that are subjected to stress relaxation tests, the stress decays with time according to o(t) = OCD)exp(-5 where o(t) and (0) represent the time-dependent and initial (i.e. time = 0) stresses, respectively, and t and t denote elapsed time and the relaxation time; t is a time-independent constant characteristic of the material. A specimen of a viscoelastic polymer whose stress relaxation obeys the above equation was suddenly pulled in tension to a measured strain of 0.6; the stress necessary to maintain this constant was measured as function of time. Determine the relaxation modulus Er(10 s) for this material if the initial stress level was 2.8 MPa, which dropped to 1.75 MPa after 60 s. (4 marks)