Study of dynamic behavior of trapped charge in the insulating materials by using a new experimental approach

Elsafi, B.

doi:10.1016/j.elstat.2013.11.009

Cited by 1 publication

(2 citation statements)

References 12 publications

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“…Other SEMME investigations have utilised small parallelepiped samples, typically ~10 × 10 × 1-5 mm thick [22][23][24][25][26][27]32]. High injection voltages (30 kV) were used for a short duration, up to 200 ms [23][24][25][26][27][28], though longer injection times (10-20 s), at lower voltages (<19 kV) have also been employed [32]. Thus for the relatively large beam-shaped samples used in our study, a number of preliminary trials were undertaken to determine the most appropriate procedures and settings.…”

Section: Semme Testsmentioning

confidence: 99%

“…The duration between irradiation and completing the nine readings was within five minutes. All samples were irradiated only once for these measurements, to avoid the risk of any influence caused by remaining charge effects from previous irradiation, including possible material degradation [28,32]. Thus for repeatability, at each voltage setting, a mean value of d could be determined from five similar samples, to provide plots for test and control samples at 2% and 15% Vf and the resin-only samples.…”

Section: Semme Testsmentioning

confidence: 99%

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An evaluation of the scanning electron microscope mirror effect to study viscoelastically prestressed polymeric matrix composites

Wang

Fancey

2017

Materials Today Communications

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A viscoelastically prestressed polymeric matrix composite (VPPMC) is produced by applying tensile creep to polymeric fibres, the creep load being removed before the fibres are moulded into a resin matrix. Following matrix curing, the viscoelastically strained fibres impart compressive stresses to the surrounding matrix, counterbalanced by residual tension in the fibres. VPPMCs based on nylon 6,6 fibres in polyester resin have previously demonstrated improvements in mechanical properties of up to 50% compared with control (unstressed) counterparts. Although the associated viscoelastic recovery forces are understood, little is known of the fibre-matrix interactions relating to prestress within VPPMCs. This is addressed by investigating composite samples with the scanning electron microscope mirror effect (SEMME). By comparing results from VPPMC samples with their control counterparts, the findings suggest that there are ~30% fewer trapped negative charges in the former, implying that the VPPMCs possess higher fibre-matrix interfacial strengths. Tensile test results on similar composite samples support these findings. The effects of resin porosity in SEMME data are also evaluated and our findings suggest that porosity can significantly increase charge trapping.

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