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Evaluation of stress-strain state of vehicles’ metal structures elements

Hrevtsev O., Selivanova N., Popovych P., Poberezhny L., Rudyak Yu., Shevchuk O., Poberezhna L., Ivanova A., Skyba O., Shashkevych O., Hrytsanchuk A.

Archives of Materials Science and Engineering

2022

Vol. 113, nr 2

77--85

Purpose: Develop a method for determining and evaluating the stress-strain state, in particular the distribution of thermomechanical stresses in the materials of individual rotating parts of vehicles. Design/methodology/approach: The proposed method is based on the principle of gradual approximations of the solution when the boundary conditions are satisfied on the curvilinear limiting surfaces of the disk body. Findings: The proposed method of determining and estimating the distribution of thermomechanical stresses in the disk material makes it possible to take into account the variable geometry: thickness and presence of a hole in the central part of the disk, also correctly determine stress strain state at any point of unevenly heated rotating axial body. Research limitations/implications: The work uses generally accepted assumptions and limitations for thermomechanical calculations. Originality/value: It is proved that in real disks the stress-strain state is spatial, and the well-known method based on the hypotheses of the plane-stress state does not provide the possibility of calculating the values of stresses in the thickness of the disk. The obtained results can be used as a basis for improving the methodology of auto technical examination of road accidents. In addition, they can be taken into account by design engineers of car brake systems.

Analysis of Mechanical and Thermal Stresses in a Pressure Casting Machine Plunger

Jankowski Jacek, Kołakowski Dariusz, Pisarek Bogusław Piotr

Advances in Science and Technology. Research Journal

2020

Vol. 14, no 1

209--223

The study discusses the thermo‑mechanical stress distribution in the plunger of a cold chamber casting machine with a horizontal casting chamber in the stationary aspect. The main stresses as well as the reduced stresses were determined for four different strength hypotheses, two of which took into account different acceptable maximal tensile and compressive stresses. For comparative purposes, the calculations were performed for three different construction materials used for cold chamber pressure machine plungers: grey pearlitic cast iron, high silicon bronze and beryllium bronze, as well as one more type of bronze, which has not been used for plungers so far, i.e. aluminium‑iron‑nickel bronze, constituting the initial alloy for the newly‑developed complex bronzes with high wear resistance and elevated strength.

Analiza numeryczna wybranych elementów silnika wysokoprężnego

Derewońko A., Niezgoda T., Małachowski J.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

1999

z. 9

57-62

W pracy przedstawiono numeryczną analizę naprężeń termomechanicznych w wybranych elementach silnika wysokoprężnego. Wykorzystując możliwości systemu programów obliczeń inżynierskich MSC PATRAN i NASTRAN wyznaczono rozklady temperatur w tłoku i tulei cylindrowej pochodzące od gazów spalinowych przy założonych warunkach przewodzenia i przejmowania ciepła. Następnie wyznaczono rozkłady naprężeń pochodzące od obliczonych pól temperatur, obciążenia ciśnieniem gazów spalinowych wewnątrz komory spalania oraz siłami bezwładności.

In this paper a numerical analysis of thermomechanical stress/strain in a selected elements model of the Diesel engine has been presented. By using MSC/NASTRAN and PATRAN finite elements method calculating system, the temperature distributions of combustion gazes at assumed heat transfer and absorptia conditions were fixed. Then, the stress distributions from fixed temperature fields, inertial forces and pressure loads caused combustion gases inside the combustion chamber were determined.