A Joint Numerical-Experimental Study on Impact Induced Intra-laminar and Inter-laminar Damage in Laminated Composites
A Joint Numerical-Experimental Study on Impact Induced Intra-laminar and Inter-laminar Damage in Laminated Composites
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DOI：
10.1007/s10443-015-9457-0
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发表时间：
2016-06
影响因子：
2.3
通讯作者：
A. Riccio;F. Caputo;G. Felice;S. Saputo;C. Toscano;V. Lopresto
中科院分区：
文献类型：
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作者：
A. Riccio;F. Caputo;G. Felice;S. Saputo;C. Toscano;V. Lopresto
由于同时发生破坏现象，研究纤维增强复合材料层合板在冲击载荷下的力学响应可能是非常困难的。的确，由于低速冲击的结果，纤维和基质破裂等层内损伤和分层等层间损伤可能会同时发生。这些损伤机制会导致复合材料结构的强度和稳定性显著降低。本文提出了一种数值与实验相结合的研究方法，旨在通过无损检测技术(超声和热成像)和非线性显式有限元分析，来完整地描述低速冲击下复合材料层合板的冲击损伤。事实上，拟议的数值工具已被用于提高对通过非破坏性技术获得的实验数据的理解。根据AECMA(欧洲航空航天制造商协会)prEn6038标准，给出了三种不同冲击能量下测试样品的应用。数值研究和实验研究的相互作用使我们能够详尽地了解碰撞事件的不同阶段，包括层间损伤的形成和演化。
The investigation of the mechanical response of fibre-reinforced composite laminates under impact loads can be very difficult due to the occurrence of simultaneous failure phenomena. Indeed, as a consequence of low velocity impacts, intra-laminar damages, like fibre and matrix cracking, and inter-laminar damages, such as delaminations, can take place simultaneously. These damage mechanisms can lead to significant reductions in strength and stability of the composite structure. In this paper a joint numerical-experimental study is proposed which, by means of non-destructive testing techniques (Ultra-sound and thermography) and non-linear explicit FEM analyses, aims to completely characterise the impact induced damage in composite laminates under low velocity impacts. Indeed the proposed numerical tool has been used to improve the understanding of the experimental data obtained by Non-Destructive Techniques. Applications on samples tested according to the AECMA (European Association of Aerospace Manufacturers) prEn6038 standard at three different impact energies are presented. The interaction between numerical and experimental investigation allowed to obtain an exhaustive insight on the different phases of the impact event considering the inter-laminar damage formation and evolution.