Creep characterization of gels and nonlinear viscoelastic material model

Abstract

In this paper, we examine gel creep behavior and develop a material model for useful and simple numerical simulation of this behavior. This study has three stages and aims: (1) gel creep behavior is examined; (2) the material model is determined and the material constants are identified; and (3) the versatility of the material model and the constants are evaluated. The creep behavior is found to be independent of the initial stress level in the present experiment. Thus, the viscoelastic model proposed by Simo is selected, and its material constants are identified using the results of creep tests. Moreover, from the results of numerical calculations and experiments, it is found that the chosen material model has good reproducibility, predictive performance and high versatility.

Momentum dependence of pion-induced ϕ meson production on nuclei near threshold

“…8. These values are motivated by the results from the φ production experiments [17][18][19][20]. It is seen that these cross sections reveal some sensitivity to the above shifts in the momentum range of 0.6-1.1 GeV/c (where they are the greatest) studied in the HADES experiment.…”

“…We adopt σ tot π − N = 35 mb for the incident pion momentum of 1.7 GeV/c [49]. For the cross section σ φN we also adopt the values σ φN = 10, 20, 30, and 40 mb motivated by the results from the φ photoproduction experiments at SPring-8/Osaka [17], JLab [18,50], from the proton-nucleus ANKE-at-COSY experiment [19,20], from the analysis [32] of the data [17] within the GiBUU transport model, from the Vector Dominance Model analysis [51] of the forward γp → φp differential cross section, from the analysis in this work of coherent and incoherent φ meson photoproduction on nuclei in terms of single and coupled-channel photoproduction, as well as from the estimates [52] for σ φN in vacuum and in matter. In Eqs.…”

“…φ production in nuclei has also been studied experimentally by the LEPS [17], CLAS [18] and ANKE [19,20] Collaborations at the SPring-8, JLab and COSY facilities. Large in-medium φN absorption cross sections σ φN of about 35 mb and of 16-70 mb were extracted by Glauber-type analysis from the φ photoproduction data collected by the LEPS and CLAS Collaborations [17,18] for average φ momenta ≈ 1.8 and 2 GeV/c, respectively. This cross section in the range of 14-21 mb at φ momenta of 0.6-1.6 GeV/c has been inferred by the ANKE Collaboration [19,20] from the comparison of the measured transparency ratio normalized to carbon with the respective model calculations.…”

Absorption of $\omega$ and $\phi$ mesons in the inclusive photonuclear reaction

“…It should be mentioned that the (semi)hadronic decay products of the ω and φ mesons are not absorped in the nucleus, as these mesons (as mentioned above) dominantly decay outside the nucleus. Therefore, the (semi)hadronic decay channels are also partinent probes for studyng the nuclear transparency of the ω and φ mesons [13,18].…”

Elastic modulus of thermoplastic elastomers investigated with the instantaneous volumetric strain method

“…Because of their simple preparation method, modifiability, and recyclability, TPEs have garnered significant academic and industrial attention for a wide range of applications, such as those in the automotive industry, medical instruments, and bionics materials . Compared with other soft materials, the stress–strain relationship of TPEs is complicated, and the elastic modulus [ K ( t )] is widely used to assess their mechanical performance . The spherical indentation method is commonly used to measure the K ( t ) values of elastoplastic materials .…”