Applied Mathematics and Mechanics (English Edition) ›› 1987, Vol. 8 ›› Issue (11): 1019-1026.

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PHOTO VISCOELASTICITY-AN EXPERIMENTAL METHOD IN VISCOELASTIC STRESS ANALYSIS

Karl-Hans Laermann   

  1. Bergische Universitat-Gesamthochschule Wuppertal, West Germany
  • Received:1986-05-11 Online:1987-11-18 Published:1987-11-18

Abstract: In this paper, the photoviscoelasticity method of viscoelastic stress analysis has been discussed in detail.lt is shown that,in order to avoid the effects of shrinkage andaging in the test specimens, it is suggested that the specimens should be tempered for three days at a temperature of 60℃ before starting the experiments, and the temperature filtering arrangement is recommended in the experimental setups to keep the temperature absolutely constant. Besides the axi-symmetrical time-dependent stress state, the determination of the principle axes of the refraction tensor experimentally remains an unsufficiently solved problem. To avoid dynamic effect in the step wise loading, the time of measurement in every step should be limited in about one secend.

Key words: alpine meadow, land-atmosphere coupling model, turbulence transfer, numerical simulation, field obervation

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