Determination of Viscoelastic Poisson’s Ratio and Creep Compliance from the Indirect Tension Test

Determining temperature and time dependent Poisson’s ratio of asphalt concrete using indirect tension test

“…The method removes the integral or differential operators to create a constitutive equation that has an algebraic form identical to elastic materials. Lee and Kim [11] expressed the m-value in space domain, mðsÞ as follows:…”

“…Lee and Kim [11] determined the complex m-value with respect to angular frequency and time by a creep test up to 100 s using IDT mode. The researchers used only a single temperature (10°C).…”

Clarifications of Certain Ambiguities and Failings of Poisson’s Ratios in Linear Viscoelasticity

“…Yet, publications continue to appear in respectable archival journals which miss the point by either assuming that viscoelastic PRs are constants or that the EVCP applies to PRs or by extending special PR concepts into general regions where they have been proven to be inapplicable or by using all of the above. References [15][16][17][18] are some representative recent examples. 1 The Class II PRs defined by ν I I 12 (x, t) def = 22 (x, t)/ 0 11 (x) for time independent strains in the 1-D loaded direction are sensitive to a number of non-material contributions.…”

Determination of Viscoelastic Poisson’s Ratio of Solid Propellants using an Accuracy‐enhanced 2D Digital Image Correlation Technique

“…Thus, to feed the numerical techniques, experimental determination of time-varying Poisson's ratio of the propellant grains is of practical importance. However,s ince solid propellant grains are very flexible and soft in nature, it is extremely challenging to use existing experimental techniques to accurate measure its time-dependent Poisson's ratio, whichi se xpected to vary from compressible (v < 0.5) to incompressible (v % 0.5) and thusd emanding very high accuracyo ns train measurements.To determine the Poisson's ratio of solid propellants, both indirect and direct measurementt echniquesc an be used [6][7][8].T he indirect measurement methods first measure other material parameters, such as tensile/compressive modulus ands hear modulus, Poisson's ratio is then numerically computed based on the transversal relationship among these material parameters. Becauset he indirect techniques involve multiple measurement and fitting of several mechanical parameters, their practical implementation is not only troublesome, but also prone to induce large measuremente rrors due to the error accumulation involved in various steps.I nc ontrast, the direct measurement …”