Scale effects on the response of composite structures under impact loading
Scale effects on the response of composite structures under impact loading
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DOI：
10.1016/j.engfracmech.2007.03.001
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发表时间：
2008-06-01
影响因子：
5.4
通讯作者：
Lataillade, Jean-Luc
中科院分区：
文献类型：
--
作者：
Viot, Philippe;Ballere, Ludovic;Lataillade, Jean-Luc
近年来，复合材料在交通运输（航空、航海、汽车等）结构设计中发挥了重要作用。为了确定这类结构的性能，必须进行初步的验证试验。这些特定的测试通常非常昂贵且难以设置Lip，特别是当文件结构尺寸较大时（机身或飞机，船体…）。另一种方法是采用小规模模型。使用这些缩小比例的结构需要识别相似模型，允许将小尺度模型的行为外推到实际结构。虽然在均匀材料的情况下，这种相似技术得到了很大的发展，但考虑到撞击过程中的损伤演变，这种相似技术还没有明确地应用于复合材料。本文的目的是首先介绍现有的相似技术，使得从小尺度模型响应的知识来预测复合结构的行为成为可能。其次，在两种尺度的样品上进行了单向碳/环氧层分层实验。最后将这些结果与目前使用的相似定律的分析预测进行了比较。本文的目的是促进相似律的发展适用于组合结构。这些规律使我们能够将小尺度模型的行为外推到实际的尺度上。现有的方法是根据两种不同的方法建立的。本文对这些方法进行了总结，并将其应用于两种层合板尺度上的冲击载荷。为了完成“传统”仪器（力传感器、位移传感器、加速度计等）收集的数据，使用了高速CCD相机等光学设备，并结合光学技术监测标记物。这些技术使得比较每个尺度对应的位移线成为可能。结果表明，现有的弹性材料的相似规律不能很好地模拟该材料被破坏时的真实尺度行为。(c) 2007 Elsevier Ltd.版权所有。
For several years, composite materials have taken a significant part in the realization of structures designed for transport (acronautical, nautical, automotive...). In order to qualify the behavior of such structures, preliminary validation tests have to be done. These specific tests are often very expensive and difficult to set Lip, especially when file structure dimensions are large (fuselages or aircraft, ship hulls...). An alternative way is then to employ small-scale models.The use of these reduced scale structures requires the identification of similitude models allowing the extrapolation of the small-scale model behavior to the real structure. Although largely developed in the case of homogeneous materials, such similitude techniques arc not clearly identified for composite materials taking Into account the damage evolution during an impact.The purpose of this article is firstly to present existing similitude techniques making it possible to predict the composite structure behaviour from the knowledge of small-scale model response. Secondly, experiments were done on two scale of samples carried out by stratification Of Unidirectional carbon/epoxy plies. These results were finally compared with the analytical predictions of similitude laws currently used.The aim of this paper is to contribute to similitude laws development applied to composite structures. These laws permit to extrapolate the small-scale model behavior to the real scale one. Existing approaches have been established following two different methods. They are summarized in this paper and applied to impact loadings on two laminated plate scales. In order to complete data collected by "conventional" instrumentation (force transducer, displacement sensor, accelerometer...), optical device such as an high-velocity CCD camera, associated with optical techniques for the monitoring of markers, Were Used. These techniques make possible to compare displacement lines corresponding to each scale. It is shown that existing similitude laws, used for elastic materials, do not allow to simulate the behavior of the real scale when this one is damaged. (c) 2007 Elsevier Ltd. All rights reserved.