Assessment of alternative joining techniques for Ti–6Al–4V/CFRP hybrid joints regarding tensile and fatigue strength

Kashaev, Nikolai; Ventzke, Volker; Riekehr, Stefan; Dorn, Falk; Horstmann, Μ.

doi:10.1016/j.matdes.2015.04.051

Cited by 54 publications

(20 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A solution to avoid galvanic corrosion is to use fasteners or shields made of a metal with less difference in the galvanic potential compared to carbon-reinforced composite. Titanium alloys are a good example of such materials [ 122 ], but the fasteners made of them are expensive and heavy compared to fasteners made of aluminum alloys [ 16 , 121 ]. Since thousands of fasteners are usually used to join the aircraft structure, it results also in a severe cost and weight penalty [ 123 ].…”

Section: Fastener Typesmentioning

confidence: 99%

Mechanical Joining of Fibre Reinforced Polymer Composites to Metals—A Review. Part I: Bolted Joining

Galińska

2020

Polymers

View full text Add to dashboard Cite

As the fibre reinforced plastic composites gain larger and larger share in industry, the problem of joining them with metal elements becomes significant. The current paper is the first part of the literature review, which gathers and evaluates knowledge about methods suitable for mechanical joining of composite and metal elements. This paper concerns bolted joining, because this method of mechanical joining is widely used for joining composite materials. The paper describes failure modes of bolted joints in composite materials, the influence of the bolt clamping torque, the clearance between the bolt and the hole and aging on the performance of the joint, drilling techniques used in composite materials in order to minimize damages, different fastener types, inspection techniques, and finally, the techniques that have been developed in order to improve the strength of the bolted joints in composites. Since the hole drilled in a composite material in order to perform bolted joining is a weak point of the structure, those techniques: bonded inserts, titanium foil internal inserts, fibre steering, additional reinforcement, and moulded holes, mainly aim to improve the strength of the hole in the composite. The techniques have been discussed in details and compared with each other in the summary section.

show abstract

Section: Fastener Typesmentioning

confidence: 99%

Mechanical Joining of Fibre Reinforced Polymer Composites to Metals—A Review. Part I: Bolted Joining

Galińska

2020

Polymers

View full text Add to dashboard Cite

show abstract

“…Due to the high assembly and repair efficiency, low requirements for surface treatment and good compatibility between CFRPI materials and Ti alloys, mechanically fastened CFRPI-Ti alloy joints are more favorable as compared with the corresponding bonded joints in aircraft engine structures. 1 Meanwhile, the screws are often used to tighten the fastener from only accessible one side of the structure with a smoother surface. 2 Thus, the high-temperature performances of the screwed CFRPI-Ti alloy joints are of great concern in the design and repair of aircraft engine structures.…”

Section: Introductionmentioning

confidence: 99%

High-temperature effect on the mechanical performance of screwed CFRPI–TC4 alloy joints repaired with metal inserts

Zhu

Xiong

2019

Journal of Composite Materials

View full text Add to dashboard Cite

This paper seeks to study high-temperature effect on mechanical performance of screwed single-lap carbon fiber-reinforced polyimide–TC4 titanium alloy joints repaired with metal inserts. Quasi-static tension tests were conducted at room temperature (RT) and 250℃ to determine the joint strength and stiffness of repaired joints with metal inserts. Based on the experimental results, high-temperature effect on joint strength and stiffness and insert repair efficiency were analyzed and discussed. A new analytical model was established to evaluate the effect of high temperature on joint stiffness. It is concluded that (1) joint strength and stiffness for all configurations are lower at 250℃ than that at RT, showing the expected detrimental effect of high temperature on joint strength and stiffness. The reductions in joint strength and stiffness depend on the joint configuration; (2) the repair efficiencies of embedded conical nut for joint strengths of protruding and countersunk head screw joints decrease, but those for joint stiffness increase at 250℃ as against at RT. Unlike the repair efficiencies of embedded conical nut, the repair efficiency of bushing for joint strength is slightly greater, but that for joint stiffness is less at 250℃ than at RT; and (3) the developed analytical model is capable of predicting the displacement of screwed single-lap carbon fiber-reinforced polyimide–TC4 joints at RT and high temperature, and there is good agreement between the experimental data and the predicted curves.

show abstract

“…Wang et al [5] studied hybrid joints between carbon fibre reinforced polymers (CFRP) and titanium Ti-6Al-4V, using the Comeld ™ electron beam machining technology [6] to sculpt surface protrusions which enhanced bond strength considerably. Working with a similar material combination, Kashaev et al [7] investigated 'laser rivetted' hybrid joints, observing mechanical properties which were comparable to those of traditional riveted joints. Ko et al [8] characterised hybrid joints made of stainless steel 'z-pins' under fatigue and environmental conditions, with pins being worked mechanically prior to insertion for increased surface roughness and hence improved crack bridging performance.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical studies on the braiding of carbon fibres over structured end-fittings for the design and manufacture of high performance hybrid shafts

Sun

Kawashita

Wollmann

et al. 2018

Prod. Eng. Res. Devel.

View full text Add to dashboard Cite

Braiding is an attractive manufacturing method for tubular elements such as hollow shafts and struts. One of the main challenges however is the integration of suitably performing end-fittings. Recent advances in additive layer manufacture have enabled the fabrication of end-fittings which can be 'co-impregnated' or 'co-cured' with the fibre preform in a single step, i.e. without the need for secondary adhesive bonding. This requires the introduction of protrusions onto the surface of the end-fitting to promote mechanical interlocking with the fibres. However, the lack of accurate modelling tools for the simulation of this manufacturing process means that much empiricism is currently used in the design of such structures. A novel numerical framework is presented here for the full-scale simulation of the braiding process over structured end-fittings. Nonlinear finite element analysis is applied at the meso-scale, with strands of beam elements representing individual yarns and meshed surfaces modelling the mandrel and tooling. Penalty-based contact formulations are then used to simulate all inter-yarn and yarn-metal interactions, enabling detailed predictions of fibre paths around surface protrusions. In order to verify and validate this numerical framework, a series of full-scale braiding experiments was conducted using additivelymanufactured thermoplastic mandrels. Final braid patterns as well as the occurrence of braid imperfections were investigated and compared to model predictions. It is shown that the proposed modelling strategy reproduces well the trends observed experimentally in terms of final braid quality. A parametric study was then conducted on the effects of initial end-fitting alignment with respect to oncoming yarns, suggesting that better control over this parameter could reduce considerably the occurrence of braid imperfections.

show abstract

Assessment of alternative joining techniques for Ti–6Al–4V/CFRP hybrid joints regarding tensile and fatigue strength

Cited by 54 publications

References 10 publications

Mechanical Joining of Fibre Reinforced Polymer Composites to Metals—A Review. Part I: Bolted Joining

Mechanical Joining of Fibre Reinforced Polymer Composites to Metals—A Review. Part I: Bolted Joining

High-temperature effect on the mechanical performance of screwed CFRPI–TC4 alloy joints repaired with metal inserts

Experimental and numerical studies on the braiding of carbon fibres over structured end-fittings for the design and manufacture of high performance hybrid shafts

Contact Info

Product

Resources

About