Experimental and finite element analysis of fatigue performance of copper power conductors

Nasution, Fachri P.; Sævik, Svein; Gjøsteen, Janne K.Ø.; Berge, Stig

doi:10.1016/j.ijfatigue.2012.09.006

Cited by 14 publications

(8 citation statements)

References 15 publications

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“…where n i is the number of stress cycles with the stress range S i , which is calculated using the RFC method, and a and m are material parameters in the S-N diagram, which were set to 6.098 9 10 19 and 6.238, respectively, in this study [22]. No fatigue limit was considered; thus, all of the stress ranges contributed to the total fatigue damage.…”

Section: Fatigue Damage Analysismentioning

confidence: 99%

“…Additional studies have also addressed the same issue: Nasution et al [20][21][22] conducted a series of experiments and FE analyses to study the fatigue life of copper power conductors. Their research provided insight into the failure mechanisms of power conductors, and the fatigue properties of the conductors were presented in S-N diagrams.…”

Section: Introductionmentioning

confidence: 99%

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Parametric study of the dynamic motions and mechanical characteristics of power cables for wave energy converters

2017

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A case study of a point-absorber wave energy converter (WEC) system is presented. The WEC system forms an array, with several WECs located around a central hub to which they are each connected by a short, freehanging power cable. The objective of the study is to analyse the dynamic characteristics and estimate the fatigue life of the power cable which is not yet in use or available on the commercial market. Hence, a novel approach is adopted in the study considering that the power cable's length is restricted by several factors (e.g., the clearances between the service vessel and seabed and the cable), and the cable is subject to motion and loading from the WEC and to environmental loads from waves and currents (i.e., dynamic cable). The power cable's characteristics are assessed using a numerical model subjected to a parametric analysis, in which the environmental parameters and the cable's design parameters are varied. The results of the numerical simulations are compared and discussed regarding the responses of the power cables, including dynamic motion, curvature, cross-sectional forces, and accumulated fatigue damage. The effects of environmental conditions on the long-term mechanical life spans of the power cables are also investigated. Important cable design parameters that result in a long power cable (fatigue) service life are identified, and the cable service life is predicted. This study contributes a methodology for the first-principle design of WEC cables that enables the prediction of cable fatigue life by considering environmental conditions and variations in cable design parameters.

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Section: Fatigue Damage Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Parametric study of the dynamic motions and mechanical characteristics of power cables for wave energy converters

2017

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“…For the power cable, the experimental data from Nasution et al [35] are adopted. These data are based on the assumption that the copper wires in a power cable carry the load of the entire cable structure.…”

Section: Fatigue Damage Analysismentioning

confidence: 99%

“…These data are based on the assumption that the copper wires in a power cable carry the load of the entire cable structure. Consequently, the material parameters ˛ and m in the S-N curve are assigned values of 6.0 × 10 10 and 3, respectively, for the moorings [22] and 6.098 × 10 19 and 6.238, respectively, for the cable [35].…”

Section: Fatigue Damage Analysismentioning

confidence: 99%

Biofouling on mooring lines and power cables used in wave energy converter systems—Analysis of fatigue life and energy performance

Yang

Ringsberg

Johnson

et al. 2017

Applied Ocean Research

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a b s t r a c tThis study presents an analysis of a wave energy converter (WEC) system consisting of a buoy, a mooring system, and a power cable connected to a hub. The investigated WEC system is currently under full-scale testing near Runde in Norway. The purpose of the study was to investigate the characteristics of the entire system, primarily with regard to energy performance and the fatigue life of the mooring lines and power cable, considering the effects of marine biofouling and its growth on the system's components. By means of parametric study, the energy performance and fatigue life of the mooring lines and power cable were investigated considering two mooring configurations, three biofouling conditions, four sea states in a scatter diagram, and three wave and current directions. Hydrodynamic and structural response simulations were conducted in a coupled response analysis using the DNV-GL software SESAM. Energy performance analyses and stress-based rainflow counting fatigue calculations were performed separately using an in-house code. The results show that, for a WEC system which has been deployed for 25 years, biofouling can reduce the total power absorption by up to 10% and decrease the fatigue life of the mooring lines by approximately 20%.

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“…As an excellent conductive and model material, copper has drawn more and more interests from engineers and scientists in recent decades. With the fast development of economy, the demand for electricity consumption increases; the fatigue failure of the rotor parts made of copper in wind, steam, and water turbines inevitably appears and begins to draw the attentions from some engineers . Compared with them, scientists have preferred choosing copper as a typical model material with face‐centered cubic (FCC), made them into single‐, bi‐, poly‐crystals, and ultrafine, nano, even nano‐twinned (NT) crystals and studied their surface slip characteristics, dislocation patterns, cyclic deformation mechanisms, and so on .…”

Section: Introductionmentioning

confidence: 99%

Low‐Cycle Fatigue Behavior and Life Prediction of Copper Busbar

et al. 2016

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Copper has many applications especially in rotor parts subjected to fatigue loading. From them, a typical copper busbar is chosen to mainly investigate the low-cycle fatigue (LCF) behaviors, fracture morphologies, dislocation patterns and crack initiation mechanism. It is found that with total strain amplitude increasing, cyclic softening appears in all the samples; the fatigue crack initiation sites transform mainly from slip bands to grain boundaries; the dislocation spacing of the post-fatigue samples decreases; by comparison, the Basquin-Manson-Coffin and the simplified hysteresis energy relations are relatively simple and accurate methods to predict fatigue life. Finally, the LCF properties of the coppers with different grain sizes prepared by different technologies are compared and optimized.

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Experimental and finite element analysis of fatigue performance of copper power conductors

Cited by 14 publications

References 15 publications

Parametric study of the dynamic motions and mechanical characteristics of power cables for wave energy converters

Parametric study of the dynamic motions and mechanical characteristics of power cables for wave energy converters

Biofouling on mooring lines and power cables used in wave energy converter systems—Analysis of fatigue life and energy performance

Low‐Cycle Fatigue Behavior and Life Prediction of Copper Busbar

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