Combined DIC and FEA method for analysing debonding crack propagation in fatigue experiments on wrapped composite joints

Feng, Weikang; He, Pei; Pavlović, Marko

doi:10.1016/j.compstruct.2022.115977

Cited by 11 publications

(3 citation statements)

References 36 publications

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“…to have infinite fatigue life. This is attributed to to favourable fatigue crack retardation that is found in wrapped composite joints on smaller scale as presented in [6]. Further estimation of the fatigue life at the design FLS load level, with help of literature published on wrapped composite joints so far, is given in chapter 4.2.…”

Section: Interpretation Of Full-scale Wrapped Composite Joint Fls Tes...mentioning

confidence: 96%

Full scale testing of fatigue resistant composite joints for offshore wind Jacket and Floating structures

Pavlovic,

Koetsier,

Yang

et al. 2024

J. Phys.: Conf. Ser.

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Complex welds in the joint region reduce the fatigue resistance of structural joints of circular hollow sections with factors that results in increased wall thicknesses of the tubes and overspending of steel in the multi-membered part of the jacket and floating support structures for offshore wind turbines. The wrapped composite joint is a breakthrough technology utilising bonding and fatigue resistant composite material to connect steel tubular members instead of welding. The main technical advantage is that the superior fatigue life of wrapped composite joints. Full-scale wrapped composite joint is tested by cyclic out-of-plane bending loading in resonance-based Cronos testing rig at OCAS N.V. in Belgium. Results reveal exceptional fatigue life of wrapped joints to combined loading when compared to welded joints, showcasing a potential that can radically reduce steel use for offshore structures.

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Section: Interpretation Of Full-scale Wrapped Composite Joint Fls Tes...mentioning

confidence: 96%

Full scale testing of fatigue resistant composite joints for offshore wind Jacket and Floating structures

Pavlovic,

Koetsier,

Yang

et al. 2024

J. Phys.: Conf. Ser.

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show abstract

“…Digital image correlation (DIC), as a non destructive testing technique, 30,31 is widely used for monitoring the deformation characteristics of structures. Feng et al 32 analyzed the crack extension of the wrapped composite joints under fatigue by a combination of finite element analysis (FEA) and DIC techniques. Xin et al 33 used FE method and DIC tests to analyze and identify buckling of cylindrical thinwalled structures with defects.…”

Section: Introductionmentioning

confidence: 99%

Experimental validation study on snap through and coiling up of deployable composite shells

Chang,

Zhao,

et al. 2023

Polymer Composites

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Bistable reeled composite shells (BRCS) have been widely used in deployable space structures due to advanced properties of light weight and large volume reduction. A finite element simulation and experimental validation to study the transition of BRCS between their two stable states are performed. In this article, multiscale representative volume element (RVE) modeling is used to compute the equivalent mechanical properties of carbon/epoxy plain woven fabrics that were utilized to construct the deployable composite laminates, followed by experimental verification. The deformation characteristics and strain energy distribution of the deployable composite shell (DCS) during snap through and coiling up are investigated using finite element analysis (FEA) and verified by strain‐gauge and digital image correlation (DIC) tests. The results show that the strain energy distribution in the snap through and coiling up of the carbon/epoxy plain woven BRCS with laminate stacking sequence of [+45/−45] is approximately symmetric. Additionally, an offset phenomena is observed during the coiling up of the BRCS in the finite element modeling. A parametric analysis is complemented to investigate effects of fiber angles on the deformation characteristics and strain energy distribution of the shell structures during snap through and coiling up.Highlights Shell deformation during snap through and coiling up was investigated. DIC test was performed to capture the shell deformation. Strain energy distribution of the deployable composite shell was discussed. Offset phenomena are observed during the coiling up.

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“…The composite joint is the key technology of the integrated structure of these materials. This technology, which can significantly reduce the number and weight of the connection parts and improve the connection efficiency, is applied to the main components of the composite materials [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Investigations on the Mechanical Properties of Composite T-Joints with Defects under Bending Loading

et al. 2022

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The composite T-joint, a typical structural element, is widely used in the fields of aerospace due to their excellent mechanical properties. However, several defects might occur in this material during manufacturing because of the application of co-curing and co-bonding technologies. The existence of the defects results in the reduction in the load bearing capacity, which negatively affects the safety of the structure. In this study, a finite element (FE) model of composite T-joints is established, which is verified by quasi-static tests to investigate the load bearing capacity and failure modes of composite T-joints under bending loadings with different types of defects, including core material defects, radius floating of the fillet, and debonding defects. It is indicated that the failure modes of T-joints with different kinds of defects under bending loadings are similar, i.e., the delamination occurs firstly at the interface between the filling area and the L-rib before expanding to both sides. Meanwhile, the types of defects exert great effects on the load bearing capacity of T-joints, and the debonding defects in the arc area represent the most dangerous one. Furthermore, the orthogonal test method was adopted to analyze the influence of combined defects on the load bearing capacity of T-joints, and the findings reveal that the most sensitive type of defect is the debonding defects, followed by the radius floating of the fillet, and then core material defects. This result indicates that combined defects have a coupling effect on the load bearing capacity of composite T-joints. This study provides theoretical guidance and technical support for the repair of the defects of composite T-joints.

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Combined DIC and FEA method for analysing debonding crack propagation in fatigue experiments on wrapped composite joints

Cited by 11 publications

References 36 publications

Full scale testing of fatigue resistant composite joints for offshore wind Jacket and Floating structures

Full scale testing of fatigue resistant composite joints for offshore wind Jacket and Floating structures

Experimental validation study on snap through and coiling up of deployable composite shells

Investigations on the Mechanical Properties of Composite T-Joints with Defects under Bending Loading

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