Fatigue analysis of a composite ring: Experimental and theoretical investigations

Abstract

The behavior of composite rings against fatigue loading is analyzed. Experimental study is performed to evaluate the ultimate hoop strength of the composite ring as a requirement before fatigue testing. Then, fatigue tests are performed at three different load levels. Afterward, progressive damage modeling in the context of continuum damage mechanics is utilized to theoretically estimate fatigue lifetimes of the investigated rings. The modeling consists of three parts as stress analysis, damage estimation and degradation of mechanical properties. It is mainly aimed to reduce the required runtime for the accomplishment of fatigue analysis while the accuracy is at least compromised. Therefore, a manual technique is adapted for extracting stress components on the ring. Degradation of mechanical properties takes place either through gradual procedure or sets of sudden laws. The gradual degradation of mechanical properties is performed based on the damage progression as a function of cycle numbers and stress state. Sudden degradation is done after occurrence of failure. After reduction of mechanical properties, the model is updated and whole procedure repeats till the whole layers fail. Finally, the results of fatigue modeling are compared with performed experimental study and a very good agreement is observed.

Study on Composite Material Failure of Reinforced Thermoplastic Pipes under External Pressure

“…Overestimating this capacity can lead to catastrophic failures of pipes, whereas underestimating the amount of product that can be transported lowers production and increases cost [3]. A number of studies have examined the mechanical performance and failure criterion of glass fiber-reinforced plastic pipes [6][7][8][9][10][11][12][13][14][15].…”

Experimental study on the effect of graphene nanoplatelets on the low‐velocity impact response of prestressed filament wound basalt‐based composite pressure vessels

“…Rafiee and Abbasi [35] carried out numeric and experimental studies using the split-disk test method to estimate the burst pressure of GFRP pipes. The ultimate hoop strength of the filament wound composite ring utilizing this method against fatigue cycles was analyzed by Rafiee et al [36] Another work led by Rafiee [37] includes theoretical analyses for predicting the failure of composite cylinders subjected to LVI. Moreover, Rafiee et al developed a theoretical solution to predict failure in CPVs subjected to LVI under internal pressure.…”