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Analysis of operation of arch frictional joint loaded with the impact of freely falling mass

Brodny J.

Studia Geotechnica et Mechanica

2013

Vol. 35, nr 1

59--72

Yielding support, commonly applied to secure dog headings, is made of carrying elements in the form of steel frames and friction props. Yielding capacity of this support is realized in frictional joints, which due to their geometry can be divided to straight and arch joints. Occurring in steel frames arch frictional joints are characterized with more complex loading state than straight joints used in friction props. In the article, there is presented an analysis of the state of stress and deformation of the arch frictional joint, which was carried out on the model of these joints using finite element method. The scope of the analysis included two methods of loading of arch frictional joint, namely its axial compression and bending. In both cases, joints were loaded dynamically with the impact of freely falling mass. Arch joints with and without passive pressure were submitted to an axial compression. Physical model of the frictional joint was developed on the basis of a system applied during the stand tests. To solve mathematical model an explicit integration method was used. As a result of analyses carried out, temporal courses of force transmitted through the frictional joint, and displacements of section sliding down were determined. On the basis of the temporal courses, dependences between maximum value of force transmitted through the frictional joint and the height from which the impact mass falls down were determined. Distributions of reduced stresses in elements of frictional joint were also determined and the state of deformation was described. In order to emphasize the difference between straight and arch frictional joints, also an analysis of internal forces in arch frictional joint depending on its geometrical parameters without and with passive pressure was presented.

Analiza obciążenia łukowego złącza ciernego

Brodny J.

Mechanizacja i Automatyzacja Górnictwa

2011

R. 49, nr 12

13-19

W odrzwiach obudowy podatnej stosowanej w wyrobiskach korytarzowych występują łukowe złącza cierne. Złącza te mają decydujący wpływ na parametry pracy odrzwi i całej obudowy. Ze względu na powszechność stosowania odrzwiowej obudowy podatnej do wyrobisk korytarzowych bardzo istotne znaczenie ma analiza pracy tych złączy. W artykule przedstawiono analizę sił wewnętrznych w łukowym złączu ciernym w zależności od jego parametrów geometrycznych. Wyznaczono geometryczny współczynnik złącza łukowego charakteryzujący zależność pomiędzy cięciwą łuku a jego strzałką, który ma bardzo istotny wpływ na wartości sił wewnętrznych. Analizę przeprowadzono dla łukowych złączy ciernych bez odporu i z odporem biernym. Przedstawione wyniki świadczą o istotnym znaczeniu odporu biernego oraz geometrii łuku na rozkład sił wewnętrznych w łukowym złączu ciernym, co ma istotny wpływ na jego pracę.

In the doors of yielding supports used in dog headings there are arched friction connections. The connections have a decisive impact on the working parameters of frames and the whole support. Due to the common use of frame yielding supports in dog headings, it is vital to analyze the work of the connections. The article presents the analysis of internal forces in the arched friction connection depending on its geometric parameters. A geometric coefficient of an arched connection was calculated. The coefficient presents the dependency between the chord of the arch and its arrow and has a significant impact on the values of internal forces. The analysis was conducted for arched friction connections with no loading and with passive loading. The achieved results confirm the impact of passive loading and arch geometrics on the distribution of internal forces in the arched friction connection, which significantly influence its work.