Analysis of thermal effect on carbon fibre reinforced polymer cable (original) (raw)
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SAP, 2020
TGA measurements have been known to provide valuable information that can be used to select materials for certain applications and to predict product performance giving way for possible improvement. Polymeric cable wires were exposed to TGA analysis (after subjecting them different preheating treatments) which leads to determining their thermal stability through comparative analysis between the fingerprints of the preheated and the non-preheated samples obtained. Very reliable and valuable information was obtained which would help in predicting the product performance giving way for possible improvement of the materials.
Estimation of thermal parameters and prediction of temperature rise in crane power cables
Thermal behaviour of cables can be predicted if their loading conditions and all the thermal parameters of the materials used in them are known. However, in practice these parameters are either difficult to obtain or can be subjected to slow variations due to aging effects. An alternative approach is proposed which involves solving an inverse problem of estimating the cable thermal parameters. A general solution procedure for the problem is developed, the principle of which is based on matching the computed thermal field to that obtained from experimental measurements. The method makes use of two basic techniques: the finite element method and a gradient-based optimisation method. To illustrate the procedure and its application, a practical case study is performed on the estimation of the thermal parameters of the 6.6 kV cables used for quayside cranes. The estimated parameters are then applied to the prediction of the temperature rise in cables.
2021
The performance of pretensioned, laminated, unidirectional (UD), carbon fiber reinforced polymer (CFRP) straps, that can potentially be used for example as bridge deck suspender cables or prestressed shear reinforcements for reinforced concrete slabs and beams, was investigated at elevated temperatures. This paper aims to elucidate the effects of elevated temperature specifically on the tensile performance of pretensioned, pin-loaded straps. Two types of tests are presented: (1) steady state thermal and (2) transient state thermal. Eight steady-state target temperatures in the range of 24 °C to 600 °C were chosen, based on results from dynamic mechanical thermal analysis (DMTA) and thermogravimetric analysis (TGA). Transient state thermal tests were performed at three sustained tensile load levels, namely 10, 15, and 20 kN, corresponding to 25%, 37%, and 50% of the ultimate tensile strength of the pin-loaded straps at ambient temperature. In general, the straps were able to retain a...
Application of DSC in the Study of Thermal History of Cable Insulation Wire
SAP, 2017
Application of Differential scanning Calorimetry (DSC) was employed to study the thermal history of cable insulation wire. Samples of pre-heated and non-pre-heated polymer sample of the cable wire were analysed. From the DSC curves plotted against temperature on both pre-heated and non-pre-heated samples there are considerable differences in the curves. Moreover, the pre-heated curves obtained for pre-heated sample at 50 K/min heating rate shows very distinct similarities, the glass transition occurs at 130°C in all the samples. Two major endothermic peaks of melting and decomposition stages at different stages of temperatures between 337.2°C and 347.7°C where observed and a decomposition transition temperatures between 446.1°C and 448.6°C. These were found to be absent in the curves of the non-pre-heated sample which has only a melting transition stage. Observing the entire DSC curves and the graphs plotted, it can be seen that DSC too showed a clear difference on the thermal history of the two different cable wire samples.
Cable Thermal Loss of Life due to Time Varying Load and Ambient Temperature: A Case Study
This paper presents a case study for estimation of difference in the life of a cable in two different climate countries due to different seasonal load cycle and ambient temperature. The case study is conducted on 10kV directly buried XLPE cables which are located in two different countries, the UK and China and operates under different seasonal daily load cycles. The methodology used to solve this case study is based on an implementation of thermal life model established on Arrhenius equation, simulation of the ageing process in each season of the year and application of Miner’s cumulative damage theory to estimate the loss of life and expected life of the cable. The results show that overall estimated life of 10kV XLPE cable in the UK is 13.99 years more than China.