Thanks for posting, Jorgen. This series has been super helpful, and it is much appreciated that is to the point and in small clear snippets. Once the bulk relaxation was identical to the shear relaxation, the Poisson's ratio was for all practical purposes fix at almost 0.3. The plot is a tad deceiving since the values are changing from 0.293 to 0.296 or thereabouts and seems very steep. Although measuring the bulk is not easy, checking the assumption by measuring the Poisson's ratio and see if it stays constant in the range of strain rates of interest is trivial. One question, how does changing the bulk relaxation affects the results when there is multiaxial loading? Say a biaxial or a confined compression test. I wonder if having a relatively fix Poisson ratio could be throwing something else out of quilt. I guess that the chemistry of the polymer will ultimately dictate the bulk decay, but would the bulk spectrum change much compared to the shear one in general?
Another pinpoint video that will drop a bombshell in the mind of many.
Thanks for posting, Jorgen. This series has been super helpful, and it is much appreciated that is to the point and in small clear snippets.
Once the bulk relaxation was identical to the shear relaxation, the Poisson's ratio was for all practical purposes fix at almost 0.3. The plot is a tad deceiving since the values are changing from 0.293 to 0.296 or thereabouts and seems very steep. Although measuring the bulk is not easy, checking the assumption by measuring the Poisson's ratio and see if it stays constant in the range of strain rates of interest is trivial.
One question, how does changing the bulk relaxation affects the results when there is multiaxial loading? Say a biaxial or a confined compression test. I wonder if having a relatively fix Poisson ratio could be throwing something else out of quilt. I guess that the chemistry of the polymer will ultimately dictate the bulk decay, but would the bulk spectrum change much compared to the shear one in general?