Electromagnetic interference and electrical conductivity characteristics of carbon/polycyanate composite with nanostrands^TM under tensile load

Abstract

Electromagnetic interference (EMI) and electrostatic discharge (ESD) shielding effectiveness of M55/RS-3 composite (i.e., carbon fiber in a toughened polycyanate resin matrix) combined with nickel nanostrands TM was investigated when subjected to the monotonic tensile load. These were quantified in the terms of dB attenuation and sheet resistance, respectively. A baseline panel without nanostrands TM and three lay-ups with different locations of nickel nanostrands TM layers were characterized. These locations were outside surfaces, dispersed throughout the laminate thickness or the mid-plane. The nanostrands TM are capable of providing EMI and ESD shielding protection without any detrimental effects on the mechanical behavior of the composite (i.e., damage mechanisms and ultimate tensile strength) under the tensile loading condition. The placement of nanostrands TM on the exterior surfaces in the composite lay-up provided better EMI and ESD shielding effectiveness. The EMI protection capability from nanostrands TM at any location was practically constant with increasing tensile load up to the final fracture. However, sheet resistance did not change with increasing tensile load only when nanostrands TM were placed at the outside surfaces. The nanostrands TM layers were not damaged until the final composite fracture. FIG. 12. (a) Damage details of interlaminar panel near fracture region and (b) magnified view of marked area. FIG. 13. Damage details of exterior panel near fracture region.

Metal–Organic Pathways for Anisotropic Growth of a Highly Symmetrical Crystal Structure: Example of the fcc Ni

“…For example, the magnetization saturation of cubic shaped nickel nanoparticles (NPs) is 10-fold higher that of spherical nanoparticles with similar size . Nickel nanostrands (micrometer long nickel wires) are currently employed for producing electrically conductive carbon composites in advanced airplane structures . The morphology of the nanomaterials, however, depends closely on the synthetic method.…”

Electromagnetic interference and electrical conductivity behavior of carbon/polycyanate composite with nickel nanostrands™ under fatigue

“…The average value of UTS for all four configurations was 450 MPa, and it varied within ±10% over the four configurations. This can be attributed to the fact that nickel nanostrands layers were intact up to the final fracture of the specimens from all three configurations as discussed in a previous study [14]. Figure 3 shows fatigue life diagrams for all four configurations, which show the applied maximum stress, S (normalized by the corresponding UTS) versus cycles to failure, N relationships for all four cases.…”

“…Table 1 shows the UTS values for the four types of laminates tested in this study, which were measured in a previous study [14]. It is interesting to note that the addition of the nickel nanostrands in M55/RS‐3 composite did not have any adverse effect on the UTS, i.e., it was not a weak link in the laminate.…”

“…However, their EMI and ESD performances are not available when subjected to mechanical loading conditions until recently. In a recent study, EMI and ESD shielding behavior of a nanocomposite consisting of carbon fibers (M55) and nickel nanostrands in a toughened polycyanate resin matrix (RS‐3) was investigated when subjected to the monotonic tensile load [14]. Three lay‐ups with different locations of nickel nanostrands layers were characterized.…”

“…This study is an extension of the above mentioned study [14], where loading condition was changed to tension–tension fatigue instead of monotonic tensile load but keeping the same nanocomposite system (i.e., polymeric composite with nickel nanostrands). Thus, this study investigated the effects of cyclic load on EMI shielding effectiveness and electrical conductivity of a nanocomposite along with damage mechanisms.…”