Increasing Strength of Graphite/Epoxy Bolted Joints by Introducing an Adhesively Bonded Metallic Insert

Nilsson, Sören

doi:10.1177/002199838902300701

Cited by 17 publications

(17 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is clearly observed from the table that the metal inserts have increased the failure load for each joint configuration. Similar trends have been reported for the bolt joint in previous study 1,18 . Figure 6 shows the effect of E/D and W/D ratios on the ultimate failure loads for the specimens with and without the metal inserts.…”

Section: Resultssupporting

confidence: 91%

“…Table 4 summarises the failure modes for different pin joint configurations, where S, N and B signifies the shear-out, net-tension and bearing type of failure modes. Introducing the metal inserts in the composite joint change the failure modes of the joints 1 . Table 4 shows that for the lower values of W/D ratios, different failure mode i.e., net-tension is observed for the specimens with the metal inserts as compared to the specimens without the metal inserts.…”

Section: Resultsmentioning

confidence: 99%

“…Nilsson 1 proposed a method to increase the failure load in graphite-epoxy bolted joints by bonding a metallic insert in the hole. Herrera-Franco 2 , et al determined stress and strain distributions in single-pin lap joints prepared from glass epoxy laminate.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Metallic Inserts on the Strength of Pin Joints Prepared from Glass Fiber Reinforced Composites

2017

View full text Add to dashboard Cite

The present study deals with the failure analysis of pin joints by varying different geometric parameters i.e., edge distance to hole diameter (E/D) ratio and width to hole diameter (W/D) ratio. Pin joints were prepared from the glass fiber reinforced laminates incorporating the metal inserts. A range of 2 to 5 and 3 to 6 was considered for E/D and W/D ratios, respectively. The stress around the hole was redistributed by incorporating the metal inserts in the hole to increase the load carrying capacity. To predict the failure loads and failure modes numerically, progressive damage analysis along with Hashin failure criteria was used in the pin joints. Strength of the pin joints increased in the range of 65 per cent to 92 per cent with metal insert due to the redistribution of the stresses around the hole. Progressive damage analysis gave a good correlation with experimental findings. Thereafter, the strength of the joint was predicted by varying the thickness of the metal inserts.

show abstract

Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Metallic Inserts on the Strength of Pin Joints Prepared from Glass Fiber Reinforced Composites

2017

View full text Add to dashboard Cite

show abstract

“…The complete test procedures and results are presented in the thesis from which this paper is extracted [5,20]. This concept of reinforcement by introduction of an adhesively bonded metallic insert in graphite/epoxy joints was also discussed in a recent paper by Nilsson [21]. He used finite element techniques to demonstrate how the high compressive stresses in the laminate could be reduced by bonding a stiff metallic insert into the hole.…”

Section: Stress and Strain Relief By The Use Of Isotropic Materials Inmentioning

confidence: 99%

Strain-Relief Inserts for Composite Fasteners -An Experimental Study

Herrera‐Franco

Cloud

1992

Journal of Composite Materials

View full text Add to dashboard Cite

The stress and strain distributions in the vicinity of single-pin lap joints in a glass-epoxy laminate were studied in a combined experimental-theoretical program. One objective was to evaluate the possibility of obtaining significant stress concentration relief through the use of isotropic material inserts. This paper concentrates on some experimental results. High sensitivity Moire interferometry was employed to measure surface strains in three directions within the insert ring and in the adjacent composite laminate. Strain rosette equations were then used to obtain maximum shear strains. Measurements were performed for no insert, a hard insert (aluminum), and a soft insert (epoxy) in an isotropic material and in a composite. Stress reductions were observed at bearing and ligament areas for both types of inserts, with the stiffer insert giving the greatest advantage.

show abstract

“…A theoretical and experimental investigation by Nilsson (1989) on increasing the bearing strength of composite bolted joints showed that by bonding a 2 mm circular metallic insert in the hole, the compressive stresses at the hole boundary were reduced by 50% and the failure load was increased by up to 55%. The purpose of this example is to optimize the shape of the insert by an optimized material distribution using ITD algorithm.…”

Section: Metallic Insertmentioning

confidence: 99%

Layout optimization of multi-material continuum structures with the isolines topology design method

Querin

Victoria

Díaz

et al. 2014

Engineering Optimization

View full text Add to dashboard Cite

ReuseUnless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. A heterogeneous or multi-material object is one made from different materials which are distributed continuously or discontinuously and where its properties can be adjusted by controlling the material composition, microstructure and geometry of the object. The development of manufacturing technologies such as rapid prototyping can eliminate the high cost of tooling and can offer the possibility to make multi-materials structures. However the ability to design them is not a trivial task and requires the development or modifications of optimization algorithms to take into consideration the different aspects of these problems. This article presents an enhancement to the ITD Osvaldo M. Querin, Mariano Victoria, Concepción Díaz, and Pascual Martí 2 algorithm which allows it to obtain multi-material designs. Four examples of the topology design of 2D continuum structures are presented to demonstrate that the ITD algorithm is an efficient and reliable method to carry out the layout optimization of multimaterial continuum structures.

show abstract

Increasing Strength of Graphite/Epoxy Bolted Joints by Introducing an Adhesively Bonded Metallic Insert

Cited by 17 publications

References 2 publications

Effect of Metallic Inserts on the Strength of Pin Joints Prepared from Glass Fiber Reinforced Composites

Effect of Metallic Inserts on the Strength of Pin Joints Prepared from Glass Fiber Reinforced Composites

Strain-Relief Inserts for Composite Fasteners -An Experimental Study

Layout optimization of multi-material continuum structures with the isolines topology design method

Contact Info

Product

Resources

About