The design of multi-sample flexural fatigue device and fatigue behavior of glass/epoxy laminated composites

Balcıoğlu, H. Ersen; Sakin, Raif; Gün, Halit

doi:10.17515/resm2018.67me0917

Cited by 7 publications

(6 citation statements)

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“…By substituting Equation 2 into Equation 1 and integrating it, we can determine the total number of extrusions allowed before reaching the end of the fatigue life. The fatigue life (Nf) was determined by the number of cycles until fracture failure [19].…”

Section: Lifetime Determinationmentioning

confidence: 99%

Reliability approach for lifetime prediction of the aluminum extrusion dies

Hadji,

Benamira,

Khelif

2024

Res. Eng. Struct. Mat.

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This paper introduces a probabilistic approach for predicting the lifetime of extrusion dies using a structural reliability method known as stress-strength interference. In our investigation, we have integrated the assessment of the die's cycle life by following behavioral and rheological law. The approach relies on estimating the reliability index through a combination of a behavioral model and a reliability analysis of the hot extrusion process. Subsequently, the reliability analysis is conducted using a mechanical model to depict the most likely failure conditions. In this regard, the rheological law of Hansel & Spittel emerges as the most suitable choice, as it incorporates the mechanical properties of the materials employed in the fabrication of hot tools. The proposed mechano-reliability approach enables us to estimate reliability and its sensitivity by adjusting the parameters controlling the input process in die formation. Numerous scenarios involving extrusion dies were considered. The results demonstrate that temperature's impact on the die during the extrusion process is manifested through fatigue and damage parameters, as well as the first equivalent strain, which affect the evolution of the reliability index β and subsequently enhance the number of billets extruded.

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Section: Lifetime Determinationmentioning

confidence: 99%

Reliability approach for lifetime prediction of the aluminum extrusion dies

Hadji,

Benamira,

Khelif

2024

Res. Eng. Struct. Mat.

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“…On the other hand, during cyclic loading damage is more slow progress under different damage mechanisms. 10 Fatigue is the main failure mechanism for structures under cyclic loading. The fatigue behavior of fiber-reinforced composite materials depends on many factors such as manufacturing process, constituent materials, fiber volume fraction, fiber orientation, interface properties, type of loading, mean stress, frequency, and environment.…”

Section: Introductionmentioning

confidence: 99%

Effects of hostile solutions on the static and dynamic behavior of carbon/epoxy composites

Balcıoğlu

Sakin

Gün

2021

Journal of Composite Materials

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Fiber-reinforced laminated composite is often used in harsh environments that may affect their static stability and long-term durability as well as residual strength. In this study, the effect of heavy chemical environments such as acid and alkaline and retaining time for these environments on flexural strength and flexural fatigue behavior of carbon/epoxy laminated composites were investigated. In this context, carbon/epoxy was retained into an acidic and alkaline solution having 5%, 15%, and 25% concentration by weight for 1–4 months. Fatigue behavior of carbon/epoxy was determined under dynamic flexural load, which corresponds to 80%, 70%, 60%, 50%, and 40% of static three-point bending strength of the test sample. SEM image of damaged specimens was taken to describe the failure mechanism of damage which occurs after fatigue. Also, to better understand environmental condition on the fatigue life, results were compared with results of carbon/epoxy laminated composites, which were not retained into any environments (unretained). The test results showed that the solution type, solution concentration, and retaining time caused noticeable changes in the static and dynamic strengths of carbon/epoxy laminated composites.

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“…In some of these machines, pure bending or torsion loads are applied, while in other machines, a combination of these two types of loading (torsion and bending) is applied. In some machines, repeated (cyclic) loading is achieved by the use of a motor (whose rotary motion is converted to pulsed motion), while in others by the use of a hydraulic or air piston that performs pulsed motion (thrust or traction) [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Estimation of Fatigue Strength of Reinforced Complete Upper Denture Using a Newly Designed Testing Machine: A Laboratory Research Project

Prombonas¹,

Poulis²,

Prombonas³

2021

JBiSE

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In the present study, an aero pneumatic fatigue testing machine for complete dentures was designed, fabricated, and tested for the evaluation of the fatigue life of reinforced complete upper denture (CUD). On completion and testing, it was observed that the machine has the potential of generating reliable number of cyclic data. The machine's performance was evaluated using test specimens of identical CUDs that were machined in conformity with standard procedures. The fatigue machine compressed the lower dental arch over the upper denture-specimen in centric occlusion, in the same way that the two masticatory muscles pull the lower jaw over the upper jaw during chewing. The incorporation of glass fibres into the CUD using a sandwich technique quadruples the lifespan of the denture (P = 0.004). The low standard deviation, along with the low coefficient of variation (CV) of the group of unreinforced dentures shows the repeatability of the results and the reliability of the machine. The high standard deviation and coefficient of variation of reinforced dentures was expected, since a high variation of results is usually recorded in fibre reinforcement cases. This research confirmed the view that the crack during denture fracture initiates in the anterior palatal area and propagates to the posterior.

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The design of multi-sample flexural fatigue device and fatigue behavior of glass/epoxy laminated composites

Cited by 7 publications

References 0 publications

Reliability approach for lifetime prediction of the aluminum extrusion dies

Reliability approach for lifetime prediction of the aluminum extrusion dies

Effects of hostile solutions on the static and dynamic behavior of carbon/epoxy composites

Estimation of Fatigue Strength of Reinforced Complete Upper Denture Using a Newly Designed Testing Machine: A Laboratory Research Project

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