Multi-stage mechanical behavior and failure mechanism analysis of CFRP/Al single-lap bolted joints with different seawater ageing conditions

Li, Hailin; Zhang, Kaifu; Cheng, Hui; Suo, Haoyuan; Cheng, Yuh Jen; Hu, Junshan

doi:10.1016/j.compstruct.2018.10.044

Cited by 43 publications

(9 citation statements)

References 40 publications

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“…4 However, the long-term durability of adhesive joints in a saline environment remains a challenge and currently limits its use in marine applications. The durability of adhesive joints is highly dependent on environmental parameters such as moisture, temperature, 4,9-11 salinity [12][13][14][15][16] and ultraviolet radiation. [17][18][19] The influence of moisture, temperature and salinity on the mechanical performance of double cantilever beam (DCB) specimens with a thin (<0.4 mm) layer of epoxy adhesive, exposed for various durations up to 150 days, has been studied.…”

Section: Introductionmentioning

confidence: 99%

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Influence of accelerated corrosion on bi-material steel-CFRP double-lap joints bonded with thick adhesive

Jaiswal

Kumar

Rooms

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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Bi-material steel-composite joints attract interest for marine applications. The marine environment imposes corrosion which is a prolonged process. This work presents a two-electrode electrochemical setup for accelerating free corrosion of the steel surfaces of bi-material joints. It is used to study the impact of accelerated corrosion on the mechanical performance of bi-material double lap specimens subjected to quasi-static tensile testing. Several test series have been conducted to evaluate the influence of overlap length and bond line thickness on shear strength and failure mode. Sixty specimens with a thick layer of methyl methacrylate adhesive have been fabricated and cured at room temperature for at least 24 h. Subsequently, 30 specimens were aged by subjecting them to electrochemical corrosion for 24 h. All specimens were tested for failure in quasi-static tensile loading while monitoring the strain fields in the joint area using digital image correlation. The measurements reveal a homogeneous shear strain field at the onset of loading, with a rapidly increasing shear strain concentration near the edges of the bond line preceding final failure. Both a decrease in the adhesive thickness and an increase in the overlap length increase the shear strength. Higher shear strength was observed for the electrochemically aged specimens than that of non-aged specimens. This is attributed to the faster residual curing of the adhesive during ageing because an increasing percentage of copper ions (released from the anode) accelerates the curing of the MMA adhesive. The electrochemically aged specimens showed mixed failure modes, i.e. cohesive failure and adhesive failure at the interface between steel and adhesive, and skin failure within the composite laminates.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of accelerated corrosion on bi-material steel-CFRP double-lap joints bonded with thick adhesive

Jaiswal

Kumar

Rooms

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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“…This induces both the matrix softening and the weakening of the fiber-matrix interface itself [ 56 , 57 ]. It is important to highlight that the shear and bearing resistances of the mechanical joints are mainly influenced by the interfacial adhesion and the matrix stiffness, respectively [ 58 , 59 ]. Nevertheless, the net-tension strength of pinned laminates is significantly affected by the tensile strength of the laminate [ 60 ].…”

Section: Resultsmentioning

confidence: 99%

Effect of Glass Fiber Hybridization on the Durability in Salt-Fog Environment of Pinned Flax Composites

Fiore

Calabrese

2021

Polymers

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The aim of the present paper is to evaluate the effect of the hybridization with external layers of glass fibers on the durability of flax fiber reinforced composites in severe aging conditions. To this scope, full glass, full flax and hybrid glass–flax pinned laminates were exposed to a salt-fog environment for up to 60 days. Double-lap pinned joint tests were performed to assess the pin-hole joints performances at varying the laminate stacking sequence. In order to better discriminate the relationship between the mechanical behavior and the fracture mechanisms of joints at increasing the aging time, different geometries (i.e., by varying both the hole diameter D and the free edge distance from the center of the hole E) were investigated after 0 (i.e., unaged samples), 30 and 60 days of salt-fog exposition. It was shown that the hybridization positively affects the mechanical performance as well as the stability of pinned composites: i.e., improvements in both strength and durability against the salt-fog environment were evidenced. Indeed, the hybrid laminate exhibited a reduction in the bearing strength of about 20% after 60 days of aging, despite to full flax laminate, for which a total reduction in the bearing strength of 29% was observed. Finally, a simplified joint failure map was assessed, which clusters the main failure mechanisms observed for pinned composites at varying aging conditions, thus assisting the joining design of flax–glass hybrid laminates.

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“…In general, the prominent failure mode of joints was bearing damage occurred on the upper surface of the holes. And the squeezing damage was found on the lower surface of the holes of composites [16]. The bolts slid and tilted, the bolt holes deformed from circular to elliptical.…”

Section: Macro Damage Mechanismsmentioning

confidence: 98%

“…To obtain the damage state of composites, various characterization techniques can be used to improve the understanding of the damage mechanisms in composites. The most widely used techniques for composite are SEM [13,16], ultrasonic C-scan [17,18], X-ray radiography [17,19,20], acoustic emission [21,22], infrared thermal imaging [23,24], DIC [25] and so on. However, the above characterization techniques have great limitations and can not directly determine the damage mechanisms and crack distribution in the 3D space of the composites.…”

Section: Introductionmentioning

confidence: 99%

Static compression testing CFRP single-lap composited joints using X-ray μCT

Zhang

Dai

et al. 2020

Composite Structures

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Multi-stage mechanical behavior and failure mechanism analysis of CFRP/Al single-lap bolted joints with different seawater ageing conditions

Cited by 43 publications

References 40 publications

Influence of accelerated corrosion on bi-material steel-CFRP double-lap joints bonded with thick adhesive

Influence of accelerated corrosion on bi-material steel-CFRP double-lap joints bonded with thick adhesive

Effect of Glass Fiber Hybridization on the Durability in Salt-Fog Environment of Pinned Flax Composites

Static compression testing CFRP single-lap composited joints using X-ray μCT

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