STABILITY THEORY METHODS IN MECHANICS PROBLEMS
Published In: 9TH INTERNATIONAL CONFERENCE ON ADVANCES IN CIVIL, STRUCTURAL AND MECHANICAL ENGINEERING
Author(s): LYUDMILA K.KUZMINA
Abstract: The research is concerned with various aspects of qualitative analysis in Complex systems dynamics, including fundamental problems of modelling in Mechanics. Generalized approch, based on Lyapunov's stability theory and Chetayev's idea, is developed. Besides the investigated objects are treated for unified view point on formed basic postulates (stability and singularity) as singularly perturbed ones. It offers ample scope to obtain the reduction principle analogue, valid for general qualitative analysis and synthesis problems; to establish the effective technique for problems of decomposition in Mechanics. The concepts and methods of classical stability theory are developed for problems of singularly perturbed systems; the statements of N.G.Chetayev and P.A.Kuzmin are extended for stability problems with parametric perturbations in non-regular case. It enables to investigate the critical and transcendental cases, inherent to mechanics systems. The non-trivial cases are considered here:
- Publication Date: 08-Dec-2019
- DOI: 10.15224/978-1-63248-182-5-16
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THE UTILISATION OF LATHE STEEL WASTE FIBERS TO IMPROVE PLAIN CONCRETE
Published In: 9TH INTERNATIONAL CONFERENCE ON ADVANCES IN CIVIL, STRUCTURAL AND MECHANICAL ENGINEERING
Author(s): AHMED HAMDI MANSI , OSAMA HUSSEIN GALAL , MUTLAQ LAFI
Abstract: We studied the effects of using industrial steel solid wastes resulted from lathes to enhance the compressive strength of concrete. In average, 3-4 Kg/lathe of steel waste fibers are produced on daily basis. Such steel waste can be recycled in order to mitigate its environmental hazards. Moreover, using it to reinforce concrete is a feasible and sustainable solution. Six (6) concrete cube specimens were casted with (1% and 2%, in terms of concrete weight) and without steel waste then tested under compression. Also, the workability of the casted fresh concrete with different ratios of steel waste (0%, 1%, and 2%) was estimated utilizing the slump test. The results shows that adding lathes steel waste fibers to plain concrete enhances its compressive strength while the workability of the fresh concrete containing the steel waste fibers decreases.
- Publication Date: 08-Dec-2019
- DOI: 10.15224/978-1-63248-182-5-05
- Views: 0
- Downloads: 0