Studies of relaxation phenomena in polymers. I. The use of periodic square and triangular stress functions
✍ Scribed by Jan-Fredrik Jansson
- Publisher
- John Wiley and Sons
- Year
- 1973
- Tongue
- English
- Weight
- 467 KB
- Volume
- 17
- Category
- Article
- ISSN
- 0021-8995
No coin nor oath required. For personal study only.
✦ Synopsis
In order to evolve the methods of mechanical spectroscopy and find new methods of studying the rise of nonlinear viscoelasticity, periodic square and triangular stress functions have been used. A "new" viscoelastic function is defined, log JZ = g { log J1 1, where J1 and JZ are the compliances a t the time (5/2 + 2 n ~) ~-, . , , for an odd, periodic, square function and an even, periodic, triangular function, respectively, with periods of 25. The function shows characteristic shapes for viscoelastic spring and dashpot models.
The interrelations between the complex compliance and J1 and JZ are developed; and since the sum of J , and JZ at the time 5/2 agrees very well with the creep compliance a t the same time, J1 and JZ can be used as an interrelation between complex compliance and creep compliance. Special equipment for measuring t.he compliances J1 nd J Z is described.