Finite Element Analysis of 2.5D Woven Composites, Part II: Damage Behavior Simulation and Strength Prediction
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Finite Element Analysis of 2.5D Woven Composites, Part II: Damage Behavior Simulation and Strength Prediction Jian Song 1,2 & Weidong Wen 1 & Haitao Cui 1 & Hongjian Zhang 1 & Ying Xu 1
Received: 30 April 2015 / Accepted: 13 May 2015 # Springer Science+Business Media Dordrecht 2015
Abstract In the first part of the work, a new 2.5D woven composites finite element model (2.5D WCFEM) which took into consideration the impact of face structures and can accurately predict the main elastic performances has been established. In this part, the stress–strain behavior and the damage characteristic of this material under uniaxial tension are simulated using nonlinear progressive damage analysis based on damage mechanics. Meanwhile, experimental investigation and fracture analysis are conducted to evaluate the validity of the proposed method. Finally, the influence of woven parameters on the mechanical behavior is discussed. Compared with the test results, a good agreement between the computational and experimental results has been obtained. The progressive damage characteristic and main failure modes are also revealed. Keywords 2.5D woven composites . Damage characteristic . Finite element analysis . Damage characteristic . Experiment
1 Introduction 2.5D angle-interlock woven composites as a new class of textile composites have a great deal of advantages over the conventional laminated composites, including nearnet-shape, better out-of-plane stiffness and strength etc. However, owing to their high anisotropic nature, it is difficult to fully predict their mechanical characteristic and damage mechanism. Compared to 3D woven or braided composites, the technology of
* Jian Song [email protected] 1
Nanjing University of Aeronautics and Astronautics Jiangsu Province Key Laboratory of Aerospace Power System, State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Jiangsu 210016, China
2
College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, People’s Republic of China
Appl Compos Mater
2.5D woven composites is more simply, and the engineering productions fabricated by this material have own of higher twisting degree. Up to now, although 2.5D woven composite material has been successfully applied in the structure of aero-engine fan blade, the studies on mechanical behavior of material are focus on the elastic property [1–3], but the reports about damage behavior and strength prediction are still limited. Some experimental researches and numerical simulations have been conducted to study on the mechanical property of material [4–6]. The test results show that the stress–strain curve has an obvious nonlinear and the fracture surfaces exist amount of fiber breaking and delaminated damage modes in the warps. Additionally, the initial cracks occur at the crossing point in outermost layer wefts, but the extension degree of damage is not obvious until just prior to failure. Masaru [7] simulated the damage
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