Variation in Electrical Properties of Laminates with Woven Carbon Fabric and Ferroelectric or Piezoelectric Particulate Epoxy due to Tensile Loading

Abstract

Measurement of electrical properties of fiber-reinforced plastics (FRPs) is an attractive method for predicting fatigue life and recording strain in FRPs. In this study, we prepared ferroelectric specimens laminated with woven carbon fabric and BaTiO 3 particulate epoxy. We measured those specimens' electrical properties during tensile testing. Electrical resistance increased slightly and the electrical capacitance decreased as the tensile stress increased up to 500 MPa. As the tensile stress increased above 500 MPa, the electrical resistance and electrical capacitance increased. The electrical resistance and capacitance may be dependent on the applied tensile stress because of delamination between an epoxy layer and a carbon fabric layer, and fiber breakage in carbon fabric layers. Capacitance degradation from the beginning of tensile testing indicates that the addition of BaTiO 3 particles into epoxy layers induced the delamination. Subsequently, piezoelectric specimens laminated with woven carbon fabric and poled lead zirconate titanate (PZT) particulate epoxy were prepared for repeated loading tests. Thereby, we investigated the relationship between loading and piezoelectric signals. Variation in the capacitance of epoxy layers rather than that in the polarization of PZT particles may be the generation mechanism of measured signals in the piezoelectric specimens. The peak interval in the piezoelectric signal waveforms was deeply related to the applied tensile stress. The peak intensity tended to increase with loading cycles.

Flexible Textile Strain Sensor Based on Copper-Coated Lyocell Type Cellulose Fabric

“…Hansen et al showed that Poly(3,4-ethylenedioxythiophene) and aliphatic polyurethane substrate retained conductive property during stretching and relaxation [16]. Kageyama et al investigated a BaTiO 3 impregnated carbon fabric, which indicated an electrical resistance during tensile tests [17]. The resistance of carbon nanotubes coated textile capacitor was studied by Yun et al which investigated the behavior of resistance during mechanical strain in textile-based capacitors consisting of Carbon nanotubes coated fabrics [18].…”

Fabrication and electromechanical characterization of mullite ceramic fiber/thermoplastic polymer piezoelectric composites

“…Furthermore, the vibration A survey of the published literature shows that process modeling of CMCs has been studied by a number of researchers. Processes that have been modeled include RMI, 15,16 CVD, 17,18 CVI, [19][20][21][22] and Sol-Gel Infiltration. 23 Impregnation of alumina matrix in eight-harness satin Nextel 610 fabric has been studied numerically in Ref.…”

“…13 On the other hand, a piezoelectric ceramic is also expected to act as an energy-harvesting material. [14][15][16][17] Kageyama et al 18 investigated energy-harvesting performance during tensile and fatigue tests of lead zirconate titanate (PZT) particle-dispersed CFRP. Hwang et al 19 also dispersed PZT in FRP and investigated its output voltage.…”

Multifunctional cellular sandwich structures with optimised core topologies for improved mechanical properties and energy harvesting performance

“…The piezoelectric elements, such as ZnO nanowires, have been reported to be hydrothermally grown onto the aramid fabrics as a composite energy generator [16]. Alternatively, a sandwich structure was developed by embedding the piezoelectric component between two composite laminates [16][17][18]. The direct integration of macro fibre composite (MFC) with the composite laminate for harvesting energy was also experimentally [20] and numerically [21] assessed based on the various vibration inputs at different application scenarios.…”