COMPARATIVE ULTRASONIC ANALYSIS OF DAMAGE IN CFRP UNDER STATIC INDENTATION AND LOW-VELOCITY IMPACT
COMPARATIVE ULTRASONIC ANALYSIS OF DAMAGE IN CFRP UNDER STATIC INDENTATION AND LOW-VELOCITY IMPACT
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DOI：
10.1016/0266-3538(94)90152-x
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发表时间：
1994-01-01
影响因子：
9.1
通讯作者：
MAISON, S
中科院分区：
文献类型：
--
作者：
KACZMAREK, H;MAISON, S
无损检测通过提供损伤起始和扩展的有用信息，在分析复合材料损伤中起着重要作用。然而，对于科学家来说，要解决的主要问题是选择如何最好地检测损坏。对于碳/环氧树脂板的冲击损伤，诸如X射线检查的广泛方法不容易使用，因为损伤并不总是完全穿透厚度。因此，有必要选择一种超声波设备，以便正确确定损伤尺寸，并检查界面分层。本文采用超声方法对比分析了准各向同性铺层复合材料在静态压入和低速冲击后的损伤情况，以及T300/914材料在两种不同铺层（准各向同性铺层和正交铺层）下的静态压入损伤情况，揭示了复合材料的损伤过程。观察到裂纹萌生门槛值、裂纹扩展、分层萌生门槛值和分层扩展。分层区域的扩展对于静态和冲击损伤与最大载荷是相似的。类似地，对于所分析的两个铺层，在穿透传输模式中获得的分层区域的传播是相似的。通过使用逐层超声分析，作者观察到一个略有不同的内部分层过程比较正交铺设和准各向同性层压板在静态压痕。另外两种方法，即断裂学和加速度测量法，与超声波结合使用来完成结果。在局部弯曲载荷下，还评估了压头直径、加载速度和加载形式等参数的影响。
Non-destructive testing plays an important role in analyzing composite damage by supplying useful information on damage initiation and propagation. However, for the scientist, the main problem to be solved is the choice of how best to detect the damage. For impact damage to carbon/epoxy plates, widespread methods such as X-ray inspection are not easy to use because the damage does not always penetrate completely through the thickness. The choice of an ultrasonic facility designed to dimension the damage correctly and give access to interface delaminations has thus proved to be necessary. The ultrasonic method has been applied here for a comparative analysis of the damage detected after static indentation and after low-velocity impact on a composite with quasi-isotropic lay-up and a comparative analysis of the damage caused by static indentation for two different lay-ups (quasi-isotropic and cross-ply) on T300/914 material.The results show the damage process. A crack initiation threshold, crack propagation, delamination initiation threshold and delamination propagation are observed. The propagation of the delaminated area is similar for static and impact damage versus the maxi-mum load. Similarly, propagation of the delaminated areas obtained in through-transmission mode is similar for the two lay-ups analyzed. By using a ply-by-ply ultrasonic analysis the authors observed a slightly different internal delamination process comparing cross-ply and quasi-isotropic laminates under static indentations. Two other methods, fractography and accelerometry, were used in association with the ultrasonics to complete the results. The influence of parameters, such as the indenter diameter and the velocity and form of loading, was also evaluated under local bending loads.