An empirical model for fatigue behavior prediction of glass fibre-reinforced plastic composites for various stress ratios and test frequencies

In this work tensile and compressive properties and fatigue performances of laminated glass fibre reinforced polymer (GFRP) composite under constant amplitude sinusoidal waveform load control at frequency of 5 Hz and at room temperature were investigated for three different types of loading: tension-tension at R= 0.1 and 0.5, reverse loading tensioncompression at R= −1 and compression-compression at R= 2 and 10 in fibre and normal to fibre directions. From these series of tests, the corresponding S-N diagrams are obtained.The dynamic stiffness during fatigue loading has shown classical degradation of the GFRP laminates. It is observed that the dynamic modulus decreases with time and the hysteresis loop area changes with some distortion according to the loading condition. Finally hysteresis loops throughout fatigue testing were examined and the variation of energy dissipated per cycle throughout the specimen lifetime was quantified. It is demonstrated that the dissipated energy during the fatigue lifetime is dependent on R-ratio and fibre orientation.However, in majority of the cases, the energy dissipated per cycle near the end of the fatigue lifetime increases as a result of an increase in the area captured by hysteresis loops.

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“…The commonly used models for representing the S-N curve are exponential and power law fatigue models (Basquin 1910) [14]:…”

Section: Stress-lifetime Studiesmentioning

confidence: 99%

Experimental Studies of Stiffness Degradation and Dissipated Energy in Glass Fibre Reinforced Polymer Composite under Fatigue Loading

Cadavid

Al-Khudairi

Hadavinia

et al. 2017

Polymers and Polymer Composites

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“…Where, the time of the strain to reach the maximum strain at lower frequency is decreased due to viscoelastic behaviors of polymer matrix composite. Epaarachchi and Clausen (2003) proposed a model of the relationship between stress ratio, stress frequency, the number of cycles to failure and applied maximum stress:…”

Section: Fiber Reinforced Polymermentioning

confidence: 99%

Examination at a Material and Structural Level of the Fatigue Life of Beams Strengthened with Mineral or Epoxy Bonded FRPs: The State of the Art

Mahal

Blanksvärd

Täljsten

2013

Advances in Structural Engineering

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This paper presents a state of the art review of different material combinations and applications of mineral-based and epoxy-based bonded Fiber Reinforced Polymers (FRP), used for the strengthening of concrete structures subjected to fatigue loading. In this review, models of the fatigue life at the material and structural level are presented. This study examines the mechanical behavior of the FRP-material, surface bonding behavior and concrete beams strengthened under fatigue loading with different types of FRP-systems. The parameters that are investigated are applied load value, time dependent effects, type of strengthened structures (shear, flexural or combined) and the configuration of sheets or plates. The building codes and researchers' recommendations are also discussed. As a result of this review, the reader will obtains an overview of suitable materials and methods for strengthening structures subjected to fatigue loading by referring to the estimated fatigue life of material and strengthening structures at various applied stress levels.

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“…More sophisticated models, concerning fatigue of fibre -reinforced polymers, appeared in recent years [70], [71], [72], [73], [74] among others. These approaches are either empirical or semi-empirical.…”

Section: Damage Accumulation Models For Static (Creep) and Dynamic Famentioning

confidence: 99%

Time-dependent failure criteria for lifetime prediction of polymer matrix composite structures

Guedes

2011

Creep and Fatigue in Polymer Matrix Composites

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The use of fibre -reinforced polymers in civil construction applications originated structures with a high specific stiffness and strength. Although these structures usually present a high mechanical performance, their strength and stiffness may decay significantly over time. This is mainly due to the viscoelastic nature of the matrix, damage accumulation and propagation within the matrix and fibre breaking. One serious consequence, as a result of static fatigue (creep failure), is a premature failure which is usually catastrophic. However in civil engineering applications, the structural components are supposed to remain in service for 50 years or more in safety conditions.One argument used to replace steel by polymer-matrix composites is its superior corrosion resistance. Yet stress corrosion of glass fibre s takes place as soon as moisture reaches the fibre by absorption. This phenomenon accelerates fibre breaking. In most 2 civil engineering applications, glass-fibre reinforced polymers (GRP) are the most common especially because raw material is less expensive.The lack of full understanding of the fundamental parameters controlling long-term materials performance necessarily leads to over-design and, furthermore, inhibits greater utilization. In this context, lifetime prediction of these structures is an important issue to be solved before wider dissemination of civil engineering applications can take place. As an example, standards dealing with certification of GRP pipes require at least 10000 hours of testing for a high number of specimens. Even though these strong requirements may be foreseen as reasonable, concerning the safety of civil engineering applications, they severely restrict the improvement and innovation of new products.The present chapter reviews some theoretical approaches for long-term criteria. Timedependent failure criteria will be presented and developed for practical applications and illustrated with experimental cases.

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An empirical model for fatigue behavior prediction of glass fibre-reinforced plastic composites for various stress ratios and test frequencies

Cited by 172 publications

References 13 publications

Experimental Studies of Stiffness Degradation and Dissipated Energy in Glass Fibre Reinforced Polymer Composite under Fatigue Loading

Experimental Studies of Stiffness Degradation and Dissipated Energy in Glass Fibre Reinforced Polymer Composite under Fatigue Loading

Examination at a Material and Structural Level of the Fatigue Life of Beams Strengthened with Mineral or Epoxy Bonded FRPs: The State of the Art

Time-dependent failure criteria for lifetime prediction of polymer matrix composite structures

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