How do you understand time dependent properties of polymers. Show a graph stress vs strain behavior...

How do you understand time dependent properties of polymers. Show a graph stress vs strain behavior of typical polymers and typical steel.

Expert Solution

All materials are time-dependent, i.e., they vary with time in response to an applied load or deformation. This phenomenon is simply a consequence of the Second Law of Thermodynamics according to which a portion of the imparted energy of deformation is always dissipated as heat by viscous forces even while the rest may be stored elastically.he dissipation is neither instantaneous nor infinitely slow and is therefore a rate process. It is this that renders the physical properties time-dependent

Time-dependent behavior may be virtually purely elastic to virtually purely viscous or it may be anything in-between. The behavior may be expressed suitably by the Deborah number 'De' the ratio of the material time scale '?_mat' on which molecular rearrangements take place, to the experimental time scale 't_exp'.

purely elastic material, De=? ; purely viscous one De=0 and for viscoelastic material De=1

Amanda K answered 2 years ago

Q1. Describe mechanical properties of stress-strain behavior of a polymer and a plastic (contrast with stress-strain...

Q1. Describe mechanical properties of stress-strain behavior of a polymer and a plastic (contrast with stress-strain curves of ceramics and metals) Q2. Describe variation of elastic/relaxation modulus with temperature. Q3. Describe viscoelasticity and examples of a rubber/elastomer.

8. Describe how we use the concepts of stress and strain to understand the mechanical behavior...

8. Describe how we use the concepts of stress and strain to understand the mechanical behavior of bone tissue. Include a definition of both and how they are calculated. 9. How does a muscle cause torque? How do we calculate the net torque for two muscles with opposing actions? Give an example using math.

Define tensile strength. Explain how polymers are characterized vis-à-vis differences in tensile stress-strain behavior.

Sketch example stress strain curves for the following material properties (2 curves on each graph): Graph...

Sketch example stress strain curves for the following material properties (2 curves on each graph): Graph 1: Brittle and Ductile Graph 2: strong and weak (relative) Graph 3: Non-linear and linear material

Use the graph below to sketch curves that demonstrate anticipated stress-strain behavior for two materials. One...

Use the graph below to sketch curves that demonstrate anticipated stress-strain behavior for two materials. One curve should represent a typical metal, the other a typical ceramic. Label the curves and use them to describe anticipated differences in material properties.

Plot schematic stress strain diagram for composite material. Show each stage in the graph and explain...

Plot schematic stress strain diagram for composite material. Show each stage in the graph and explain them.

How do we understand consumer behavior and business buyer behavior?

how do you make an engineering and true stress-strain curve given the displacement (mm) and force...

how do you make an engineering and true stress-strain curve given the displacement (mm) and force (N)

Embedded system.What do you understand by the term "real-time"? How is the concept of real-time different...

Embedded system.What do you understand by the term "real-time"? How is the concept of real-time different from the traditional notion of time? Explain your answer using a suitable example. Give an example of soft real-time task and non-real-time task. Explain the key difference between the characteristics of these two types of tasks.

( Project question ) What do you understand by strain gauge, high light major principle and...

( Project question ) What do you understand by strain gauge, high light major principle and working differences between resistance transducer and piezoelectric transducer strain gauge. please make the font of writing clear and easy to read.

Question