Englishlectures

Programs

Presented programs don’t need any particular installation after downloading. Execution of these programs can take place both from floppy disk and hard disk drive. Although they were developed for MS-DOS operating system they can be used without any restrictions both under Windows 95/98/Me, NT and Windows 2000 or XP. The programs are freeware in the whole meaning of this word. Below are shown examples of commands which should be included in system files config.sys and autoexec.bat to achieve the best functionality of presented programs.

config.sys for Windows 95/98/Me
country=046,XXX,c:\windows\command\country.sys (046 is specific for Sweden)

autoexec.bat for Windows 95/98/Me
mode con codepage prepare=((XXX) c:\windows\command\ega.cpi)
mode con codepage select=XXX

config.sys for Win NT/2000/XP
country=046,XXX,c:\winnt\system32\country.sys (046 is specific for Sweden)

autoexec.bat for Win NT/2000/XP
mode con codepage prepare=((XXX) c:\winnt\system32\ega.cpi)
mode con codepage select=XXX

there XXX should be 437, 860, 863 or 865 to see special characters in programs.

The authors of these programs are: Peter Tereszkowski and Zdzislaw Tereszkowski.

2bars.exe	Program '2bars.exe' (ver. 1.0c). Analysis of 2 bars system. With this program analysis for statically determinate system of two bars can be done. This system can be loaded by concentrated force P, which has applying point in a kinematical pair. Stiffness of bars can abruptly change. As input data it is necessary to know: - The bars’ geometry, - Value and action angle of loaded force, - Longitudinal modulus of elasticity. As a result of the analysis we get the following: - Values of internal forces in bars, - Values of stress for given cross-sections in bars, - Values of maximum of stress, - Value of displacement for given direction.
bofbeams.exe	Program 'bofbeams.exe' (ver. 1.01d), pure bending of beams. With this program analysis for pure bending of beams, for both statically determinate and statically indeterminate cases, can be done. Beams can have both pivot and fixed bearing. Stiffness of beam can abruptly change and they can be loaded by concentrated forces P(i), bending moments My(i) and continuous loads q(i) with linear variation. The above-mentioned loads can occur in any combination. As a result of the analysis we get the following: - Values of internal forces and moments for given x=xo, - Values of reactive forces for bearing, - Internal forces diagrams and bending moments diagrams, - Value of bending angle for given x=xo, - Bending angle diagram, - Value of displacement for given x=xo, - Displacement of beam diagram. All diagrams are drawn in scale, which can be changed during analysis. Scale change can be done separately along axis of beam and along value of forces or moments. By using this program the following values can be determinated: - Maximum of bending stress sigma(max), - Point’s coordinates of cross-section where maximum of bending stress occur, - Graphical position of point where sigma(max) occur.
ptrusses.exe	Program 'ptrusses.exe' (ver. 1.0c). Analysis of plane trusses. By means of this program, strength analysis of plane trusses, for both statically determinate and statically indeterminate cases, can be done. In case of statically determinate trusses, for determination of forces in truss members and reaction forces insertion of coordinates for nodes and bearings are needed. However, for statically indeterminate cases, to be able to determine nodes displacement or forces in truss members’ insertion of cross-section area and modulus of elasticity for every truss member is needed. As a result of the analysis we get the following: - Value of force in every truss member, - Value of stress in every truss member, - Factor of safety in every truss member in relation to demanded permissible stress sigma(dop), - Values of bearing reactions, - Values of displacement for interesting to us truss node, - Weight of truss, - Ability to optimize weight of truss by condition that in every truss member occurs permissible stress sigma(dop).
tofbeams.exe	Program 'tofbeams.exe' (ver. 1.0c). This program is designed for strength analysis of beams, which are subject to a load of torsional moments. This analysis concern determination of stresses and displacements as a result of free torsion for statically determinate and st atically indeterminate beams. The cross-section of beams can abruptly change. The cross-sections can be divided into: -Closed thin-walled profiles, -Open thin-walled profiles, -Circular full profiles or tubes. As a result of the analysis we get the following: -Value of torsional moment for given x=xo, -Values of angle of torsion for given x=xo, -Torsional moment diagram, -Angle of torsion diagram. All diagrams are drawn in scale, which can be changed during analysis. As a result of the analysis we also get the following: -The maximum of shearing stress tau(max), -Coordinates of the section where the tau(max) occur, -Graphical position of the section where the tau(max) occur. The program stops the analysis if the limit of elasticity is exceeded, because the theoretical basics used in the analysis are true in elastic range of material.

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