Publication

Fracture of adhesively-bonded pultruded GFRP joints under constant amplitude fatigue loading

Thomas Keller, Anastasios Vassilopoulos, Yi Zhang
2010
Journal Articles

Abstract

The fracture behavior of adhesively-bonded structural joints under tensile constant amplitude fatigue has been investigated. Double-lap joints (DLJs) and stepped-lap joints (SLJs) composed of pultruded GFRP laminates and an epoxy adhesive were examined. Both joint types exhibited a fiber-tear failure with cracks that initiated at the joint edges in the adhesive-laminate interface and then propagated in the laminates' mat layers. A linear trend of crack growth and compliance was observed for the DLJs whereas a sigmoid trend was found for SLJs. The experimental compliance method was used for the calculation of the maximum strain energy release rate, Gmax, and the incremental polynomial method for the calculation of the crack propagation rate, da/dN. Fatigue crack growth (FCG) curves established for both joint types showed that empirical constants are dependent on the joint configuration. Based on this fatigue life modeling, design allowables that correlate the developed damage with fatigue life were derived. © 2009 Elsevier Ltd. All rights reserved.

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https://infoscience.epfl.ch/entities/publication/d13cf54a-0587-4d56-a5bc-72a5d6c43ce1

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Thomas Keller, Anastasios Vassilopoulos, Yi Zhang
2010
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/d13cf54a-0587-4d56-a5bc-72a5d6c43ce1

About this result

Related concepts (11)

Fatigue (material)

In materials science, fatigue is the initiation and propagation of cracks in a material due to cyclic loading. Once a fatigue crack has initiated, it grows a small amount with each loading cycle, typically producing striations on some parts of the fracture surface. The crack will continue to grow until it reaches a critical size, which occurs when the stress intensity factor of the crack exceeds the fracture toughness of the material, producing rapid propagation and typically complete fracture of the structure.

Fracture mechanics

Fracture mechanics is the field of mechanics concerned with the study of the propagation of cracks in materials. It uses methods of analytical solid mechanics to calculate the driving force on a crack and those of experimental solid mechanics to characterize the material's resistance to fracture. Theoretically, the stress ahead of a sharp crack tip becomes infinite and cannot be used to describe the state around a crack. Fracture mechanics is used to characterise the loads on a crack, typically using a single parameter to describe the complete loading state at the crack tip.

Adhesive

Adhesive, also known as glue, cement, mucilage, or paste, is any non-metallic substance applied to one or both surfaces of two separate items that binds them together and resists their separation. The use of adhesives offers certain advantages over other binding techniques such as sewing, mechanical fastenings, or welding. These include the ability to bind different materials together, the more efficient distribution of stress across a joint, the cost-effectiveness of an easily mechanized process, and greater flexibility in design.

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