Theoretical formulation, Navier’s solutions of rectangular plates based on a new higher order shear deformation model are presented for the static response of functionally graded plates. This theory enforces traction-free boundary conditions at plate surfaces. Shear correction factors are not required because a correct representation of transverse shearing strain is given. Unlike any other theory, the number of unknown functions involved is only four, as against five in case of other shear deformation theories. The mechanical properties of the plate are assumed to vary continuously in the thickness direction by a simple power-law distribution in terms of the volume fractions of the constituents. Numerical illustrations concern flexural behavior of FG plates with metal-ceramic composition. Parametric studies are performed for varying ceramic volume fraction, volume fractions profiles, aspect ratios, and length to thickness ratios. Results are verified with available results in the literature. It can be concluded that the proposed theory is accurate and simple in solving the static bending behavior of functionally graded plates.
This paper uses a new refined beam theory based on neutral surface position for the static and free vibration analysis of functionally graded material beams. The theory accounts for parabolic distribution of the transverse shear strains and satisfies the zero traction boundary conditions on the surfaces of the beam without using shear correction factors. The neutral surface position for a functionally graded beam with its material properties varying in the thickness direction is determined. Based on the present refined shear deformation beam theory and the neutral surface concept, the equations of motion are derived from Hamilton's principle. A static and free vibration frequency is given for different material properties. The accuracy of the present solutions is verified by comparing the obtained results with the existing solutions.
IntroductionThe power line workers have a heavy physical workload. It is essential to know the impact of this perceived exertion on their satisfaction with life to improve their mental health.ObjectivesWe aimed to evaluate the associations between perceived exertion at work and satisfaction with life among power line workers.MethodsWe conducted a study among a group of power line workers from January to June 2022 using a self-administered questionnaire. We evaluated socio-professional characteristics, physical exertion with the Borg CR-10, and the satisfaction with life scale (SWLS).ResultsSeventy-four male line workers participated in the study. They were married in 67.6% of cases. The mean age was 39.3 ± 10.5 years. The average job tenure was 15.5 ± 11.2 years. The mean of perceived exertion was 6.1±1.9. High to very high exertion was found in 73% of participants. The mean score of satisfaction with life was 26.8 ±6.5. Five (12.6%) participants were dissatisfied to extremely dissatisfied. Fifty-six (75.9%) participants were satisfied to extremely satisfied. High perceived exertion was correlated with higher satisfaction with the lives of line workers (p = 0.03, r = 0.24).ConclusionsPower line workers with high perceived exertion were more satisfied with their lives. This can be explained by the positive impact of work on the lives of workers. The work environment is paramount to ensuring good mental health.Disclosure of InterestNone Declared
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