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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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Influential factors of loess liquefaction and pore pressure development

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Acta Mechanica Sinica 2005年第2期21卷 129-132页

作者： ChenggangZhao ZhenmaoYang FupingGao YunaZhang SchoolofCivilEngineering BeijingJiaotongUniversityBeijing100044China InstituteofMechanics ChineseAcademyofSciencesBeijing100080China

The liquefaction of loess under dynamic loading is studied experimentally with a dynamic triaxial test system. The effects of over-consolidation ratio (OCR), saturation degree and the frequency of dynamic loading upon loess liquefaction are investigated. The development of pore pressure within loess samples is also discussed. Based on the experimental results, the empirical relationship between pore pressure ratio and loading cycle number ratio is established for normal consolidated saturated loess.

关键词： Loess liquefaction Over-consolidation ratio loading frequency Saturation degree Pore pressure

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Finite element modeling of pavement responses based on stress-dependent properties of asphalt layer

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Journal of Southeast University(English Edition) 2015年第3期31卷 401-406页

作者：董尼娅李昶倪富健东南大学交通学院南京210096 东南大学江苏省道路养护工程技术研究中心南京210096

In order to investigate the stress-dependent properties of hot-mix asphalt （HMA）,a dynamic modulus test was conducted on a group of AC-20 specimens at various stress states and loading frequencies,respectively.A user-defined material （UMAT ）subroutine incorporating stress-dependent constitutive model was developed and finite element （FE）simulation was utilized to confirm the validity of the UMAT.A three-dimensional （3D ）FE model for typical pavement structure was established,considering the HMA layer as a stress-dependent material and other layers as linear elastic *** load was applied to the pavement model and the pavement responses were calculated,including dynamic modulus distributions,surface deflection,shear stress and tensile strain in the HMA layer,*** test results and FE model predictions indicate that the dynamic modulus of asphalt concrete is sensitive to stress state and loading *** the nonlinear stress-dependent model results in greater predicted pavement responses compared with the linear elastic *** is also found that the effects of stress-dependency on pavement responses become more significant as loading frequency decreases.

关键词： dynamic modulus test loading frequency stress-dependent model user-defined material (UMAT)subroutine pavement responses

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