Date of Award
Doctor of Philosophy (PhD)
Dr. Sangarappillai Sivaloganathan
Dr. Tariq Darabseh
Dr. Bilal El-Ariss
This dissertation describes an investigation on the behavior of the overlap area in telescopic cantilevers under tip loads. The main aim of this research is to address the question of ‘how the overlap region of a telescopic beam behaves under a tip load’ and to develop a new generic approach to the design of telescopic beams based on parametric studies using FEA and statistical optimization. Experimental investigations and exploratory analyses were carried out to study the behavior of RHS (Rectangular Hollow Section) rings and RHS pieces. Based on these observations, theoretical explanations were developed and a methodology for the design of the inner beam assembly based on FEA and design of experiments was recommended.
The recommended methodology was also implemented on a case study. Results showed that the overlap area can be treated as an assembly of RHS rings and a middle section or an assembly of RHS pieces and a middle section. Further, the region near the bottom wear pads of the overlap area of the inner beam is identified as most vulnerable. RHS rings are treated as an assemblage of horizontal beams and vertical columns whereas RHS pieces are treated as an assemblage of vertical and horizontal plates. When compressed transversely between platens, the constituent beams, columns, and plates in both RHS rings and pieces, are subjected to corner moments. Further, when compressed between wear pads, an additional corner moment is introduced which in effect reduces the maximum load carrying capacity further.
Because of the nature of the assembly, the end conditions of the constituent members of the RHS ring and pieces are unknown and hence complete theoretical solutions are not derived. Therefore, FEA and experimental designs were used to establish a design methodology for telescopic beams. Significant contributions from this study involve the explanation of the behavior of RHS rings and RHS pieces when compressed transversely and the development of a new generic approach to the design of telescopic beams based on parametric studies using FEA and statistical optimization.
Jacob, Neha Arieckal, "Design of Telescopic Beams Based On Parametric Studies Using FEA and Statistical Optimization" (2017). Philosophy Dissertations. 7.