ahmad gerami

The study is to identify consequences and providing solutions to social responsibility development of famous athlete. The research was descriptive and applied which utilized a thematic analysis. The population included all of the experts in the field of social responsibility in sport, in three scientific, executive and sports groups. The researchers interviewed 16 subjects by a purposive sampling method.  In the section of providing solutions, 50 open codes were obtained which put in 9 categories. Finally, we obtained seven categories of advertising-media, policy making, research, motivation, culture making, individual development, and communication. In the section of the consequences of social responsibility development, 52 open codes were obtained in 13 categories which ranked in 13 categories. Finally, five categories were obtained: sustainable development, sports development, political development, cultural development, and individual-organizational development. According to the valuable consequences of athletes' social responsibilities for society, it is recommended to form a social responsibility association in all sports organizations.

In this research, the behavior of the initial strength of a composite lattice cylinder structure under axial compressive force in the first loading and its residual strength in the second loading stages have been studied. For this purpose, in the experimental method, first, the composite cylindrical structure, with a hexagonal lattice pattern, is made using a silicone mold and filament winding process. In the first experimental loading test, the structure is subjected to axial compressive force and its initial strength at the beginning of collapse (first damage) is obtained. Then, in order to study the residual strength, the damaged structure is subjected to the second loading stage after complete unloading and recovers its initial length. Validation of force-displacement results obtained from ABAQUS finite element software has been done in comparison with the results of experimental loading tests. Next, the numerical analysis of the effect of various rhombic and triangular lattice patterns on the initial strength and residual strength of the structure is performed. The results show that the highest ratio of bearing force to weight on the collapse threshold of the structure in first loading stage is related to the triangular, hexagonal and rhombic, lattice patterns and hexagonal, triangular and rhombic lattice patterns, respectively in the second loading stage. After the second loading stage, hexagonal, triangular and rhombic lattice patterns retained 80.5%, 69.11% and 54.01% of their original strength, respectively. Also, hexagonal, triangular and rhombic lattice patterns have the highest specific absorbed energy up to the collapse threshold, respectively.

Composite materials became a great interest of researchers on light weight structures during the last decades due to their high specific strength and high specific stiffness. Lattice and grid stiffened structures are one of these efficient composite structures especially for axial compressive loads. In this research, the following main objectives are followed: (1) The buckling strength analysis of the lattice cylinders subjected to axial compressive force, (2) The impact response and damage analysis of the lattice cylinders subjected to the transverse impact of a falling object, (3) The buckling strength analysis of the lattice cylinders subjected to axial compressive force after applying transverse impact to the structure. In order to achieve the above purposes, the finite element and the experimental methods are used. In the finite element method, ABAQUS software is used to find maximum axial strength of the structure and the impact results of the structure due to its energy absorption and damage properties. In the experimental method, first, two samples of the lattice composite cylinders are made of Kevlar/Epoxy material and then they are subjected to impact test and also buckling strength tests before and after applying transverse impact when damage occurs in the lattice structure. Finally, the results of these two methods, including impact force, impact time and damage area have been compared. Results show that the damage of the structure due to the impact test, do not causes the maximum buckling strength of the structure to be reduced significantly.