Fracture mechanics-based progressive damage modelling of adhesively bonded fibre-reinforced polymer joints

AbstractNatural fibre-reinforced composites have attracted a great deal of attention by the automotive industry mainly due to their sustainable characteristics and low cost. The use of sustainable composites is expected to continuously increase in this area as the cost and weight of vehicles could be partially reduced by replacing glass fibre composites and aluminium with natural fibre composites. Adhesive bonding is the preferred joining method for composites and is increasingly used in the automotive industry. However, the literature on natural fibre reinforced polymer composite adhesive joints is scarce and needs further investigation. The main objective of this study was to investigate experimentally adhesively bonded joints made of natural, synthetic and interlaminar hybrid fibre-reinforced polymer composites. The effect of the number of the interlaminar synthetic layers required in order to match the bonded joint efficiency of a fully synthetic GFRP bonded joint was studied. It was found that the failure load of the hybrid jute/glass adherend joints increased by increasing the number of external synthetic layers (i.e. the failure load of hybrid 3-layer joint increased by 28.6% compared to hybrid 2-layer joint) and reached the pure synthetic adherends joints efficiency due to the optimum compromise between the adherend material property (i.e. stiffness and strength) and a diminished bondline peel stress state.

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Impact of scaling on fracture strength of adhesively bonded fibre-reinforced polymer piping

Procedia Engineering ◽

10.1016/j.proeng.2011.04.077 ◽

2011 ◽

Vol 10 ◽

pp. 455-459 ◽

Cited By ~ 5

Author(s):

Avinash Parashar ◽

Pierre Mertiny

Keyword(s):

Fracture Strength ◽

Adhesively Bonded ◽

Reinforced Polymer ◽

Fibre Reinforced Polymer

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Experimental analysis of adhesively bonded joints in synthetic- and natural fibre-reinforced polymer composites

Journal of Composite Materials ◽

10.1177/0021998319876979 ◽

2019 ◽

Vol 54 (9) ◽

pp. 1245-1255 ◽

Cited By ~ 5

Author(s):

HFM de Queiroz ◽

MD Banea ◽

DKK Cavalcanti

Keyword(s):

Polymer Composites ◽

Automotive Industry ◽

Natural Fibre ◽

Lap Joints ◽

Bonded Joints ◽

Adhesively Bonded ◽

Adhesively Bonded Joints ◽

Reinforced Polymer ◽

Fibre Composites ◽

Fibre Reinforced Polymer

The application of adhesively bonded joints in automotive industry has increased significantly in recent years mainly because of the potential for lighter weight vehicles, fuel savings and reduced emissions. The use of composites in making automotive body components to achieve a reduced vehicle mass has also continuously increased. Natural fibre composites have recently attracted a great deal of attention by the automotive industry due to their many attractive benefits (e.g. high strength-to-weight ratio, sustainable characteristics and low cost). However, the literature on natural fibre-reinforced polymer composite adhesive joints is scarce and needs further investigation. The main objective of this study was to evaluate and compare the mechanical performance of adhesively bonded joints made of synthetic- and natural fibre-reinforced polymer composites. Similar and dissimilar single lap joints bonded with a modern tough structural adhesive used in the automotive industry, as well as the epoxy resin AR260 (the same resin used in composite fabrication) were tested. It was found that the average failure loads varied significantly with adhesive material strength and adherend stiffness. Furthermore, it was also observed that failure mode has a significant effect in failure load. The jute-based natural fibre composites joints, both hybrid and purely natural, were superior in strength compared to the sisal-based natural composites joints.

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Flexural behaviour of reinforced or prestressed concrete beams including strengthening with prestressed carbon fibre reinforced polymer sheets: application of a fracture mechanics approach

Canadian Journal of Civil Engineering ◽

10.1139/l06-161 ◽

2007 ◽

Vol 34 (5) ◽

pp. 664-677 ◽

Cited By ~ 11

Author(s):

Yail J Kim ◽

Mark F Green ◽

R Gordon Wight

Keyword(s):

Fracture Mechanics ◽

Size Effect ◽

Carbon Fibre ◽

Prestressed Concrete ◽

Concrete Beam ◽

Concrete Beams ◽

Mechanics Model ◽

Reinforced Polymer ◽

Carbon Fibre Reinforced Polymer ◽

Fibre Reinforced Polymer

This paper describes the application of a fracture mechanics model (Hillerborg 1990) to concrete structures, including strengthening with prestressed carbon fibre reinforced polymer (CFRP) sheets. One benefit of the proposed fracture mechanics model, consisting of a unique combined stress–strain response of concrete, is that it includes the size effect of reinforced concrete beams; however, its application and validation have not been fully investigated. The proposed model is reviewed and further developed to cover prestressed concrete beams including a beam strengthened with a prestressed CFRP sheet. To evaluate the model, various approaches such as finite element analysis, a strength-based model, a conventional design method, and experimental results are compared with the fracture mechanics model. The size-dependent parameter (ε1) significantly affects the predicted behaviour of reinforced or prestressed concrete beams, depending on the contribution of reinforcement. Based on the current assessment, ε1 = 0.005 is recommended as an upper limit for normal strength concrete.Key words: carbon fibre reinforced polymer sheet, flexure, fracture mechanics, prestressed concrete beam, reinforced concrete beam, strengthening, size effect.

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Fatigue damage modeling of fibre-reinforced composite materials: Review

Applied Mechanics Reviews ◽

10.1115/1.1381395 ◽

2001 ◽

Vol 54 (4) ◽

pp. 279-300 ◽

Cited By ~ 342

Author(s):

Joris Degrieck and ◽

Wim Van Paepegem

Keyword(s):

Life Time ◽

Review Article ◽

Progressive Damage ◽

Degradation Mechanisms ◽

Damage Models ◽

Time Prediction ◽

Matrix Cracks ◽

Reinforced Composite ◽

Reinforced Polymer ◽

Fibre Reinforced Polymer

This article presents a review of the major fatigue models and life time prediction methodologies for fibre-reinforced polymer composites, subjected to fatigue loadings. In this review, the fatigue models have been classified in three major categories: fatigue life models, which do not take into account the actual degradation mechanisms but use S-N curves or Goodman-type diagrams and introduce some sort of fatigue failure criterion; phenomenological models for residual stiffness/strength; and finally progressive damage models which use one or more damage variables related to measurable manifestations of damage (transverse matrix cracks, delamination size). Although this review does not pretend to be exhaustive, the most important models proposed during the last decades have been included, as well as the relevant equations upon which the respective models are based. This review article contains 141 references.

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