In this paper we propose mathematical methodology which completely removes ambiguity related to the manual shifting procedures. Paper presents the derivation of the shifting algorithm and its validation using several simulated- and real- experimental data. The advantage of the proposed methodology is that it is based on the closed form solution, and is therefore, independent of the person who executes it. This importantly contributes to the accuracy of the obtained results of the characterization of time-dependent materials.
COBISS.SI-ID: 12193563
This paper presents a brief overview on experimental approaches accompanied with corresponding numerical procedures for characterization of time-dependent properties of viscoelastic materials. Upgraded experimental procedure is proposed for characterization of material creep and relaxation properties from a single experiment, which are usually measured separately. In addition, newly developed numerical approaches for the construction of unique master curves, and for the analysis of time-dependent materials fatigue properties are presented. The newly developed experimental-numerical methodologies are aimed to optimize process of characterization, and give complete information on time-dependent material behaviour.
COBISS.SI-ID: 12336923
This paper examines the possibility of using bimodal polyoxymethylene (POM) as the main component of the binding agent used in powder injection moulding technologies by presenting its time-dependent and thermal properties and comparing them to monomodal POM. In addition, possible optimization of the binder formulation was investigated by adding short molecular weight polymeric chains (wax) to bimodal POM. A new formulation of bimodal POM plus 8 wt.% of added wax concentration seems to provide the most appropriate results, lowest viscosity without significantly changing creep compliance values and thermal properties.
COBISS.SI-ID: 12193819