Md Zahirul Islam, Chad A. Ulven^*

Journal of Renewable Materials, Vol.10, No.5, pp. 1185-1200, 2022, DOI:10.32604/jrm.2022.018018

Abstract Among natural fibers, flax fiber reinforced polymer matrix composites show excellent dynamic/fatigue properties due to its excellent damping properties. Knowledge about fatigue limit and effect of loading frequency on fatigue limit is very crucial to know before being used a member as a structural component. Fatigue 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 approaches. Specimens of unidirectional flax fiber reinforced thermoset composites were tested under… More >

L. Susmel^1,2, D. Taylor², R. Tovo¹

Structural Durability & Health Monitoring, Vol.4, No.1, pp. 1-18, 2008, DOI:10.3970/sdhm.2008.004.001

Abstract This paper investigates some theoretical aspects related to the use of the Theory of Critical Distances (TCD) when employed to estimate notch fatigue limits. The linear-elastic TCD takes as a starting point the hypothesis that notched components are in their fatigue limit condition when an effective stress, whose value depends on a characteristic length, equals the material plain fatigue limit. Such an idea can be formalised by following different strategies: either assuming that the effective stress depends only on the profile of the stress field damaging the fatigue process zone and the reference distance is a material property or assuming… More >

L. Susmel^1,2, D. Taylor², R. Tovo¹

The International Conference on Computational & Experimental Engineering and Sciences, Vol.1, No.2, pp. 81-86, 2007, DOI:10.3970/icces.2007.001.081

Abstract This paper investigates some practical aspects related to the use of the Theory of Critical Distances (TCD) when employed to estimate notch fatigue limits. The accuracy of different formalisations of the theory was checked by using experimental data taken from the literature. This exercise allowed us to confirm that the simplest formalisation of the TCD, in which both critical distance and critical stress are material constants [1], is also the most accurate one, giving predictions falling within an error interval of about ±20%. The TCD is also accurate when applied to notches having large opening angles. More >

S. Nishida¹, N. Hattori¹

The International Conference on Computational & Experimental Engineering and Sciences, Vol.4, No.3, pp. 179-186, 2007, DOI:10.3970/icces.2007.004.179

Abstract The authors have experimentally confirmed that the non-propagating microcracks are observed in the low carbon plain specimens subjected to the stress of fatigue limit by 1×107 cycles and not observed in those of pure copper and aluminum alloys etc.. In addition, there exists clear fatigue limit in typical austenitic stainless steel SUS304 but not exist the non-propagating micro-cracks subjected to the stress of fatigue limit by 1×107 cycles. On the other hand, there exist not only clear fatigue limit but also non-propagating micro-cracks in the high manganese austenitic steel (HMA 0.20%C steel). Then, the authors have focused to the existence… More >