Author: Stefan Stefanov
Articles
- ADDITIONS TO THE SOLUTION OF THE STATICALLY INDETERMINATE PROBLEM OF TENSION IN BANDSAW BLADE
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Summary
At the Faculty of Forest Industry, seemingly for the first time in the bandsaw studies history, the statically indeterminate problem of spring mechanism tension in bandsaw blade sections was set up and solved. The solution, transferred and generalized for a horizontal bandsaw, was defended in a Ph.D. thesis. Questions and discussions arose necessitated additions and details to the solution spared in previous papers for their limited volume. Now, the following points are detailed: the concentration of distributed loads, the subcritical friction, and the application of L'Hôpital's rule for obtaining the tension of the blade in the state of idle running (without cutting).
Keywords: bandsaw, bandsaw blade, tensioning spring mechanism, statically indeterminate problem
- INTEGRATION OF DAMAGE DIFFERENTIALS: APPLICATION FROM THE FOREST INDUSTRY INTO THE CIVIL ENGINEERING
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Summary
Integration of Damage Differentials (IDD) method was developed in Faculty of Forest Industry. It is applicable e.g. for fatigue life computation of bandsaw blade. In this regard, stress oscillograms were presented. They vary about a comparatively great mean stress: in the order of the half of the maximum stress. An analogous case in bridge construction is considered in a Ph.D. thesis developed in Sofia University of Architecture, Civil Engineering and Geodesy where IDD was adopted. The great mean stress effect is clarified regarding how IDD takes it into account in contrast to standard methods in the civil engineering.
Keywords: fatigue life, integration of damage differentials (IDD), bandsaw blade, bridge, mean stress effect