Przedstawiono wyniki badań laboratoryjnych polegających na wyznaczeniu dla 6 odbojnic, identycznych odnośnie kształtu, ale wykonanych z innych elastomerów, sił reakcji i energii absorbowanej w trakcie ich ściskania. Dla jednego typu odbojnicy przeprowadzono symulację komputerową w programie COSMOS. Otrzymano dobrą Zgodność sity reakcji i energii pochłoniętej.

The crankshaft is liable to deformation due to inaccurate positioning of its main journals in the bearings. This article presents results of simulated tests of such deformations. The test results and methods for the verification of crankshaft mounting in the main bearings are assessed. A new method of measurement of crankweb deformations is proposed, the so called symmetric method, that allows the correct assessment of the condition of the crankshaft mounting in the bearings.

This article describes distributions of stresses and strains created by pressing a ball with 80 HRC hardness into soft 35HRC steel, which occurs in the technological process of burnishing. We present a computer model and a solution developed with the Nastran FX program, based on the finite elements method. The validity of the model has been checked using a small force applied on the ball, within the range of elastic deformations, where Hertz formulas are applicable. Then computations have been made for a pressure force of 30 000 N, which corresponds to hardness testing conditions by the Brinell method. The dimensions of plastic indentations from simulations and experiments are compared.

This paper presents the modeling and evaluation of contact stresses in gear teeth of the camshaft drive of a Sulzer RT48T-B engine. The evaluation has been done with the MSC Nastran for Windows system. The model has been verified for the Hertz problem for a contact of two cylinders. The model made it possible to determine the value of stresses in the contact zone and in the Bielaiev point.

The paper presents the results of simulation research based on static characteristics determination for the type series of cylindrical fenders. The discretization by finite ele-ments of geometrical model of cylindrical fender plane section was performed, taking into account hyperelastic elements and contact phenomena. The deformations and curves of the characteristics achieved in numerical calculations and experimental meth-od is presented.

The method and results of the simulation of the most essential rheological proper-ties of vibration mounts are presented. The simulation was carried out by means of a NASTRAN 3.0 demo version.

Odbojnice nabrzeżowe są urządzeniami poprawiającymi warunki bezpieczeństwa hamowania statku do nabrzeża. Ich celem jest absorpcja energii kinetycznej statku. Efekt ,en uzyskuje się poprzez zastosowanie odpowiedniego materiału i zaprojektowanie kształtu odbojnicy. W artykule przedstawiono fazę projektowania odbojnic nabrzeżnych, opierając się na badaniach modelowych odbojnic typu stożkowego Analizowano wpływ własności materiału (elastomeru poliuretanowego) i wymiarów (grubości nogi) odbojnic na ich parametry.

Przedstawiono wyniki badań laboratoryjnych, polegających na wyznaczeniu dla Materiału hiperelastycznego stałych materiałowych na podstawie próby jednoosiowego r°2ciqgcinia oraz próby ściskania. Stałe wyznaczone doświadczalnie posłużyły następnie do symulacji komputerowej obciążeń próbki walcowej.

Abstract This paper presents the results of modelling research concerned with the technological process of the cold bending of a pipe. Stress and plastic strain studies are carried out using the finite element method (FEM) on a thick-walled pipe and various shapes of bending form. The results of the research are benchmarked in terms of the correctness of the implementation of the bending process, including the change in the pipe outside diameter and wall thickness. The level of ovalisation of the cross-section in the bending pipe is used as the primary criterion for assessing the correctness of the bending process. The results show that the most favourable properties in terms of minimising the ovalisation of the pipe cross-section are provided by the use of a bending form with a trapezoidal shape.