Fatigue behaviour of non-welded wrapped composite joints for steel hollow sections in axial load experiments

Feng, Weikang; Pavlović, Marko

doi:10.1016/j.engstruct.2021.113369

Cited by 17 publications

(7 citation statements)

References 29 publications

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“…showed to be superior vs. welded when subjected to axial tension loads which is the most critical for debonding [8]. Test at small-scale are done at two different load levels per joint type.…”

Section: Fatigue Endurance Of Wrapped Composite Jointsmentioning

confidence: 99%

Wrapped Composite Joints for Circular Hollow Section Structures

Pavlovic,

Veljkovic,

Segeren

2023

ce papers

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An innovative bonding joining technology for truss/lattice circular hollow section (CHS) supporting structures is being developed as replacement for welded joints. Wrapped Composite Joint uses bonding instead of welding to transfer the joint forces and bending moments between the chord and brace CHS members through a dedicated fibre reinforced polymer composite wrap. It is aimed to replace all welds in different types of joints such as X, K, KK and splice joints in fatigue and/or corrosion dominated designs of truss/lattice structures such as offshore wind jackets and floaters, fish farms, truss bridges, etc. Composite material is known for good fatigue performance from aerospace industry and wind turbine blades. Number of joint experiments showed superior fatigue performance of the wrapped composite joints compared to welded CHS joints. This new concept allows for huge reduction of thickness of CHS members resulting in significant truss/lattice structure weight reduction and increase of fatigue lifetime. This paper presents state of development and outlook of the wrapped composite joint technology in terms of design, production and joint performance for ultimate limit state, fatigue and influence of the environment. Framework of prediction methods and design principles based on ongoing experimental and numerical research will be presented. The scope includes material, interface, and joint level experiments from small to full scale (100‐600 mm member diameter) and finite element modeling of complex steel‐composite bonded joints. Advantage of using state‐of‐the‐art monitoring techniques such as Digital Image Correlation, Fibre Optics Strain Measurement and 3D scanning is highlighted

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Section: Fatigue Endurance Of Wrapped Composite Jointsmentioning

confidence: 99%

Wrapped Composite Joints for Circular Hollow Section Structures

Pavlovic,

Veljkovic,

Segeren

2023

ce papers

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“…A decreasing trend in fatigue lives with increasing mean stresses is observed under all weld conditions. A power law relation between the S and N f is assumed in line with Basquin equation and can be expressed as [26][27][28]:…”

Section: Mechanical Property Of the Jointmentioning

confidence: 99%

Double-Pulse Ultrasonic Welding of Carbon-Fiber-Reinforced Polyamide 66 Composite

Zhi

Shu

et al. 2022

Polymers

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Ultrasonic welding of thermoplastics is widely applied in automobile and aerospace industries. Increasing the weld area and avoiding thermal decomposition are contradictory factors in improving strength of ultrasonically welded polymers. In this study, relations among the loss modulus of carbon-fiber-reinforced polyamide 66 composite (CF/PA 66), time for obtaining stable weld area, and time for CF/PA 66 decomposition are investigated systematically. Then, a double-pulse ultrasonic welding process (DPUW) is proposed, and the temperature evolutions, morphologies and structures of fractured surfaces, and tensile and fatigue properties of the DPUWed joints are measured and assessed. Experimental results show the optimal welding parameters for DPUW include a weld time of 2.1 s for the first pulse, a cooling time of 12 s, and a weld time of 1.5 s for the second pulse. The DPUW process enlarged the weld area while avoided decomposition of CF/PA 66 under appropriate welding parameters. Compared to the single-pulse welded joint, the peak load, weld area, and endurance limit of the DPUWed joint increased by about 15%, 23% and 59%, respectively. DPUW also decreases the variance in strengths of the joints.

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“…Fatigue of composites has presented researchers and designers with considerable modelling difficulties. Different from the fatigue damage of metal structure with the nucleation and propagation of one or several cracks, composite parts get global damage fields and present distinctly different, interacting damage types (including transverse cracks, delamination, debonding, edge effects, thickness and staking sequence) increases with the number of loading cycles, which hampers modelling [78,79].…”

Section: Fatigue Reliability On Bladesmentioning

confidence: 99%