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Effect of Loading Frequency on the High Cycle Fatigue Strength of Flax fiber reinforced Polymer Matrix Composites

Journal of Renewable materials 2022年第5期10卷 1185-1200页

作者： Md Zahirul Islam Chad A.Ulven Department of Mechanical Engineering North Dakota State UniversityFargoUSA

Among natural fibers,flax fiber reinforced polymer matrix composites show excellent dynamic/fatigue properties due to its excellent damping *** about fatigue limit and effect of loading frequency on fatigue limit is very crucial to know before being used a member as a structural *** limit of fiber reinforced composite is measured through high cycle fatigue strength(HCFS).The effect of loading frequency on the HCFS of flax fiber reinforced polymer matrix composites was investigated using stabilized specimen surface temperature based thermographic and dissipated energy per cycle-based *** of unidirectional flax fiber reinforced thermoset composites were tested under cyclic loading at different percentages of applied stresses for the loading frequencies of 5,7,10,and 15 Hz in order to determine the stabilized surface temperature of the specimen and dissipated energy per fatigue *** approaches predicted similar fatigue limits(HCFS)which showed a good agreement with experimental results from *** of flax fiber reinforced composites decrease little with increasing loading ***,effect of loading frequency on stabilized specimen temperature and dissipated energy per fatigue cycle was also *** specimen surface temperature increases with loading frequency,dissipated energy per-cycle does not change with loading *** degradation at higher loading frequencies may play a significant role in decreasing HCFS with increasing loading frequency.

关键词： fiber reinforced material fatigue limit fatigue modelling loading frequency life prediction

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Thermal Characteristics of Earth Blocks Stabilized by Rice Husks

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Open Journal of Applied Sciences 2023年第10期13卷 1796-1819页

作者： Mbairangone Samson Ntamack Guy Edgar Bianzeube Tikri Tsopmo Fabien Akana Ouanmini Bobet Civil Engineering Laboratory National High School of Public Works of N’Djamena N’Djamena Chad Laboratory of Mechanical Engineering and materials Mongo Polytechnic University Mongo Chad Group of Mechanics Materials and Acoustics (GMMA) Department of Physics Faculty of Science University of N’Gaoundéré N’Gaoundéré Cameroon Department of Industrial and Mechanical Engineering National High Polytechnic School of Yaoundé (ENSPY) Yaoundé Cameroon Department of Chemistry Higher Normal School of Bongor Bongor Chad

The objective of this study is to determine the thermal characteristics of bricks produced from clay soils in Chad using the asymmetric plane method. Indeed, in Sahelian countries like Chad, temperature variations are excessive. The study of the thermal behavior of a recyclable local material with low environmental impact could not only improve thermal comfort in homes, but also help mitigate the effects of climate change. It is in this context that this study is envisaged. Before carrying out these measurements, we first produced different formulations of soil blocks 0%, 1% 1.5%, 2% and 2.5% by mass of rice husks (1.25 mm sieve refusal). Brick specimens of dimensions 10 cm × 10 cm × 1 cm were developed at 0 day, 7 days and 14 days of maturation of the formulated pastes. After, those bricks were submitted after drying to the measurements of various thermal parameters: in particular the conductivity, the effusivity, the volumetric capacity and the diffusivity. The obtained results show that the addition of rice husks to clay soils improves conductivity by 13% to 49%, effusivity by 19% to 24%, volumetric capacity by 23% to 27%, and diffusivity by 47% to 58% for the Moundou soils, depending on the maturation period. For the N’Djamena soil, these thermal characteristics are improved from 11% to 38%, from 11% to 13%, from 40% to 47% and from 39% to 40% respectively.

关键词： Thermal Conductivity Bricks Mixtures fiber reinforced material Thermal Confort

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