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首页> 外文期刊>Journal of acoustic emission >ACOUSTIC EMISSION DETECTION OF DAMAGE INITIATION IN ID CFRP NCF COMPOSITES SUBJECTED TO BENDING
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ACOUSTIC EMISSION DETECTION OF DAMAGE INITIATION IN ID CFRP NCF COMPOSITES SUBJECTED TO BENDING

机译：ID CFRP NCF复合材料受弯破坏的声发射检测

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摘要

Acoustic Emission was applied to detect microcrack initiation in unidirectional (1D) carbon fiber reinforced composites (CFRP) subjected to 4-point bending. Materials were prepared from polyester (PES) bonded 1D carbon fiber fabric and epoxy resin using the RTM technology. Fiber volume content of composites varied from small (35%) through medium (51%) to high (68%). Samples were cut from 1D composite plates to the size of 120x20x2mm in two orthogonal directions - along fibers [0] and across fibers [90]. Selected samples had part of their tensile surface (in bending) pre-polished to enable microscopic (SEM) observations. Samples were subjected to monotonic and step-loading tests in 4-point bending while Acoustic Emission (AE) sensors attached to samples' surfaces monitored the damage initiation. The AE Historic Index proved to be the most reliable AE parameter indicating damage initiation, which allowed to interrupt loading sequence before failure. Details of microcracks were observed under the SEM on polished composite tensile surfaces loaded in bending. Fiber debonding and breakage occurred simultaneously and were the first defects to initiate damage in the examined materials.
机译：应用声发射来检测单向（1D）碳纤维增强复合材料（CFRP）进行4点弯曲的微裂纹萌生。材料是使用RTM技术由聚酯（PES）粘合的一维碳纤维织物和环氧树脂制成的。复合材料的纤维体积含量从小（35％）到中（51％）到高（68％）不等。将样品从一维复合板沿两个正交方向切成120x20x2mm的尺寸-沿纤维[0]穿过纤维[90]。所选样品的部分拉伸表面（弯曲时）已预先抛光，以便进行显微镜（SEM）观察。对样品进行4点弯曲的单调和阶跃载荷测试，同时连接到样品表面的声发射（AE）传感器监视损伤的开始。 AE历史指数被证明是最可靠的AE参数，它指示破坏的开始，从而允许在破坏之前中断加载顺序。在SEM下在弯曲加载的抛光复合拉伸表面上观察到微裂纹的细节。纤维的脱粘和断裂同时发生，并且是引起被检查材料损坏的首个缺陷。

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