Impact on composite structures

2004 ◽  
Vol 108 (1089) ◽  
pp. 541-563 ◽  
Author(s):  
G. A. O. Davies ◽  
R. Olsson
Keyword(s):  
Composite Structures ◽  
Structural Damage ◽  
Impact Damage ◽  
Laminated Composite ◽  
Design Tools ◽  
Laminated Composite Structures ◽  
Consequent Reduction ◽  
The Subject ◽  
Research Initiatives ◽  
Damage Tolerant

The problem of impact damage in laminated composite structures, and the consequent reduction in residual strength, has been a topic of continual research for over two decades. The number of journal papers on the subject now runs into four figures and most have been conscientiously reviewed by Abrate(1991, 1994, 1998). This review is not intended to be in the academic tradition, with emphasis on acknowledging the authorship of all the various research initiatives. Instead we present our opinions so that the reader can appreciate our current understanding of the problem, our capability of predicting by analysis, and the scope of the design tools for avoiding structural damage, or at least designing damage tolerant aerospace structures.

scholarly journals A model of low-velocity impact damage assessment of laminated composite structures

2018 ◽  
Vol 188 ◽  
pp. 01012 ◽  
Author(s):  
Konstantinos P. Stamoulis ◽  
Stylianos K. Georgantzinos ◽  
Georgios I. Giannopoulos
Keyword(s):  
Composite Structures ◽  
Mechanical Performance ◽  
Impact Damage ◽  
Experimental Testing ◽  
Laminated Composite ◽  
Element Model ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Damage Initiation ◽  
Laminated Composite Structures

Laminated composites have important applications in modern aeronautical structures due to their extraordinary mechanical and environmental behaviour. Nevertheless, aircraft composite structures are highly vulnerable to impact damage, either by low-velocity sources during maintenance or high-velocity sources during in-flight events. Even barely visible impact damage induced by low-velocity loading, substantially reduces the residual mechanical performance and the safe-service life of the composites structures. Despite the extensive research already carried out, impact damage of laminated composite structures is still not well understood and it is an area of on-going research. Numerical modelling is considered as the most efficient tool as compared to the expensive and time-consuming experimental testing. In this paper, a finite element model based on explicit dynamics formulations is adopted. Hashin criterion is applied to predict the intra-laminar damage initiation and evolution. The numerical analysis is performed using the ABAQUS® programme. The employed modelling approach is validated using numerical results found in the literature and the presented results show an acceptable correlation to the available literature data. It is demonstrated that the presented model is able to capture force-time response as well as damage evolution map for a range of impact energies.

The Study on J-Integral of Composite Laminated Plate Crack Propagation Problem

2012 ◽  
Vol 166-169 ◽  
pp. 3083-3086
Author(s):  
Dong Zhao ◽  
Yang Zhao ◽  
Xiang Rong Fu ◽  
Wen Jie Wang
Keyword(s):  
Crack Propagation ◽  
Composite Structures ◽  
Structural Damage ◽  
Integral Formula ◽  
Laminated Composite ◽  
J Integral ◽  
Laminated Structure ◽  
Composite Laminated Plate ◽  
Micro Cracks ◽  
Laminated Composite Structures

The micro-cracks would occurr with the deformation in the composite materials. It would be expanded to the macro-crack in bonding surface and eventually leads to the overall damage of the structure. The initial defects will be inevitably involved in the production of the laminated composite structures. They also lead to delamination crack propagation and structural damage. This paper focuses on the application of the J-integral in the delamination of the composite laminated structure. The J-integral formula of the planar delamination problem of composite laminated structure was derived and verified in the numerical examples.

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