Damage mechanisms characterisation of carbon fibre/epoxy composite laminates by both electrical resistance measurements and acoustic emission analysis
Damage mechanisms characterisation of carbon fibre/epoxy composite laminates by both electrical resistance measurements and acoustic emission analysis
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DOI：
10.1016/1359-6462(95)00638-9
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发表时间：
1996-04-15
影响因子：
6
通讯作者：
Vincent, L
中科院分区：
文献类型：
--
作者：
Ceysson, O;Salvia, M;Vincent, L
碳纤维增强塑料（CFRP）提供高的特定机械性能（性能与重量比）。由于碳纤维是电导体（ρ = 2.10 Ω·m），因此电阻变化的测量似乎是用于损伤检测的有价值的技术。在CFRP样品的情况下，导电性不是各向同性的，而是取决于碳纤维的取向。平行于纤维的（0{degree}）单向（UD）CFRP的导电是由于电流沿纤维沿着流动。这可以使用并联电阻方法来建模。在目前的工作中，电导率的变化可以作为一个指标，在经典的纵向UD的各种类型的损伤的演变，但也在（{+-} 45{degree}）CFRP层压板。通过比较与一个更经典的非破坏性技术，如声发射，它已被证明，它是可能的，电阻测量允许一个监测在现场的演变的各种内部损伤的成核和生长的CFRP，如纤维断裂，层内基体裂纹和层间分层。
Carbon fiber reinforced plastics (CFRP) offer high specific mechanical properties (performance vs weight ratio). Since carbon fibers are electrical conductors ({rho} = 2.10{sup {minus}5} {Omega}.m), the measurement of the variations of electrical resistance appears to be a valuable technique for damage detection. In the case of CFRP samples, conductivity is not isotropic but depends on the orientation of the carbon fibers. The electrical conduction of (0{degree}) unidirectional (UD) CFRP parallel to the fibers is due to the current flow along the fibers. This can be modeled using the parallel resistance approach. In this present work, the variation of the electrical conductivity can be taken as an indicator of the evolution of various types of damage in classical longitudinal UD but also in ({+-} 45{degree}) CFRP laminates. By comparison with a more classical non-destructive technique such as Acoustic Emission, it has been shown that it is possible that the electrical resistance measurement allows one to monitor in-situ the evolution of various internal damage nucleation and growth in CFRP such as fiber fractures, intraply matrix cracks and interply delaminations.