caa a22 4500 465813968 CHVBK 20180323112122.0 cr unu---uuuuu 170327e19901101xx s 000 0 eng 10.1007/BF01329296 doi (NATIONALLICENCE)springer-10.1007/BF01329296 Malkin A. Research Institute of Plastics, NPO Plastmassy, Perovskii Proezd 35, 111112, Moscow, USSR aut Some inverse problems in rheology leading to integral equations [Elektronische Daten] [A. Malkin] Two inverse problems of the integral type, which are of the general importance to rheology, are discussed. The first of them is the possibility of calculating the molecular weight distribution (MWD) from the flow curve and the second one is the interrelation between creep and relaxation functions. It was shown that the first problem is incorrect and any solution is unstable in respect to minor experimental errors. It means that the general solution of this problem is impossible in principle and only estimations of the width of unimodal MWD can be received from the curvature of the flow curve. The possibility of the correct calculation of the creep function exists in case the relaxation curve being approximated by the sum of exponential members. But the approximation of the relaxation curve within the experimental accuracy is the necessary, but not sufficient condition for the correct solution of this integral inverse problem, because not every mode of approximation leads to the satisfactory prediction of creep function. Steinkopff, 1990 M olecular weight distribution nationallicence f low curve nationallicence c reep nationallicence r elaxation nationallicence Rheologica Acta Steinkopff-Verlag 29/6(1990-11-01), 512-518 0035-4511 29:6<512 1990 29 397 https://doi.org/10.1007/BF01329296 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01329296 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Malkin A. Research Institute of Plastics, NPO Plastmassy, Perovskii Proezd 35, 111112, Moscow, USSR aut NATIONALLICENCE 773 0- Rheologica Acta Steinkopff-Verlag 29/6(1990-11-01), 512-518 0035-4511 29:6<512 1990 29 397 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer