The program calculates the time dependent radial belling and the axial longitudinal alteration of a thin walled cylinder which is incriminated with an inside pressure and an axial strength.
In the BASIC-Version the influence is considered. It would only determine the dicrease of the wall thickness on the basic of the volume constance.
The PRO(fessional)-Version considers the increase of the nominal stress with waning cylinder wall thickness.The results are consequently more realistic. However, the wall thickness decrease leads to progressively climbing stresses with increasing time and consequently to accelerated creeping. This causes a faster wall thickness reduction. The iterative charge is finished, as soon as no solution is possible. The last convergent time is passed out.
Decisive the creeping length is determined of course by the election of the constants of the Nortonschen Creeping law. Here, we are always gratefully for datas. If you therefore can make corresponding data available, with literature-source, please send us these per e-mail. Then we want to make it accessible for all users.
The datas which are deposited in the example lead to relatively low creeps in the Basic-version in the calculation with up to 10.000h, the influence of the wall-thickness decrease is neglected
The PRO-Version of the calculation already leads the crawl to strong decrease of the wall thickness very quickly. The results of BASIC- and PRO-Version therefore can deviate (in dependence on the calculated crawling time) strongly from each other.