Effect of permanent indentation on the delamination threshold for small mass impact on plates

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:44

Article

Zheng, D.¹  Binienda, W. K.¹ 

[1] Univ Akron, Dept Civil Engn, Akron, OH 44325 USA

关键词: contact law;    impact damage;    analytical modeling;    delamination;    threshold;    laminated composites;   

DOI  :  10.1016/j.ijsolstr.2007.06.005

来源: Elsevier

【 摘 要 】

Small mass impacts on composite structures are common cases caused by hailstones and runway debris. Small mass impactors usually result in a wave controlled local response, which is independent of boundary conditions. This response occurs before the reflection of waves from the boundaries and cannot be modeled by large mass drop weight tests. An elasto-plastic contact law, which accounts for permanent indentation and damage effects, was used here to study small mass impact on laminated composite plates. By comparing with results from the Hertzian contact law, it was found that damage can change the dynamic response of the structure significantly with increasing impact velocity. Due to smaller contact force generated for the case of using elasto-plastic contact, the central displacement of the plate is also less than the one using Hertzian contact law. The linearized version of the contact law was then used to derive the closed-form approximations of the contact force, indentation and plate central displacement for the impact loading of composite laminates. The threshold velocity for delamination onset under small mass impact was predicted analytically based on the obtained peak contact forces by combining with an existing quasi-static delamination threshold load criterion. A good agreement was found between the predicted threshold values and published experimental results. (c) 2007 Elsevier Ltd. All rights reserved.

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