scholarly journals A computational model for analysing interactive buckling and delamination growth in composite structures

Sadhana ◽  
1996 ◽  
Vol 21 (5) ◽  
pp. 547-575 ◽  
Author(s):  
B P Naganarayana ◽  
S N Atluri
Keyword(s):  
Computational Model ◽  
Composite Structures ◽  
Delamination Growth ◽  
Interactive Buckling

scholarly journals Influence of Gradual Damage on the Structural Dynamic Behaviour of Composite Rotors: Experimental Investigations

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2421 ◽  
Author(s):  
Angelos Filippatos ◽  
Maik Gude
Keyword(s):  
Mechanical Properties ◽  
Composite Structures ◽  
Dynamic Behaviour ◽  
Experimental Investigations ◽  
Catastrophic Failure ◽  
Structural Dynamic ◽  
Delamination Growth ◽  
Reinforced Composite ◽  
Out Of Plane ◽  
Effective Mechanical Properties

Fibre-reinforced composite structures subjected to complex loads exhibit gradual damage behaviour with the degradation of the effective mechanical properties and changes in their structural dynamic behaviour. Damage manifests itself as a spatial increase in inter-fibre failure and delamination growth, resulting in local changes in stiffness. These changes affect not only the residual strength but, more importantly, the structural dynamic behaviour. In the case of composite rotors, this can lead to catastrophic failure if an eigenfrequency coincides with the rotational speed. The description and analysis of the gradual damage behaviour of composite rotors, therefore, provide the fundamentals for a better understanding of unpredicted structural phenomena. The gradual damage behaviour of the example composite rotors and the resulting damage-dependent dynamic behaviour were experimentally investigated under propagating damage caused by a combination of out-of-plane and in-plane loads. A novel observation is the finding that a monotonic increase in damage results in a non-monotonic frequency shift of a significant number of eigenfrequencies.

Damage diagnosis and prognosis in composite double cantilever beam coupons by particle filtering and surrogate modelling

2020 ◽  
pp. 147592172096006
Author(s):  
Demetrio Cristiani ◽  
Claudio Sbarufatti ◽  
Marco Giglio
Keyword(s):  
Probability Density Function ◽  
Probability Density ◽  
Density Function ◽  
Composite Structures ◽  
Double Cantilever Beam ◽  
Remaining Useful Life ◽  
Delamination Growth ◽  
Reinforced Plastics ◽  
Diagnosis And Prognosis ◽  
Useful Life

Delamination is a failure mechanism which is intrinsic of laminated fibre-reinforced plastics and possibly one of the major concerns of laminated composite structures, since, under certain conditions, delaminations can grow up to an hazardous extent without visible traces. In order to keep pace with recent condition-based maintenance requirements, proper validated diagnostic and prognostic methods which should be capable of operating on-line and in real time are required. In this respect, particle filters provide a consistent Bayesian framework, where the posterior distribution of the system degradation status is recursively approximated based on a time-growing stream of observations measuring the system response. However, the real-time operation capability of such methods is hindered by their requirements in terms of analysis time, which is mainly due to the complexity of the models they rely upon. Within this work, a particle filter framework, able to deal with the inherent stochasticity of fatigue delamination growth – while simultaneously relieving the computational burden associated with the evaluation of the trajectory likelihoods – is provided, leveraging on surrogate modelling strategies. Simultaneous diagnosis and prognosis of a simulated carbon fibre-reinforced plastics double cantilever beam specimen subject to fatigue delamination growth are performed, based on the observation of the strain field pattern acquired at some specific locations. The posterior probability density function of the delamination extent during propagation is updated at each inspection time as well as the probability density function of the remaining useful life. Ultimately, the adoption of the augmented state formulation allows for the estimation and updating of the joint probability density function of the parameters driving the stochastic delamination propagation model. Results demonstrate the feasibility and potential of the proposed approach as a tool able to monitor the progressing delamination while simultaneously providing estimates about the remaining useful life of composite structures.

Finite Element Interface Technology for Modeling Delamination Growth in Composite Structures

AIAA Journal ◽  
2004 ◽  
Vol 42 (6) ◽  
pp. 1252-1260 ◽  
Author(s):  
Antonio Pantano ◽  
Ronald C. Averill
Keyword(s):  
Finite Element ◽  
Composite Structures ◽  
Delamination Growth

Modeling Delamination Growth in Composite Panels Subjected to Fatigue Load

2014 ◽  
Vol 627 ◽  
pp. 21-24 ◽  
Author(s):  
Aniello Riccio ◽  
F. Ronza ◽  
Andrea Sellitto ◽  
Francesco Scaramuzzino
Keyword(s):  
Composite Structures ◽  
Fatigue Behavior ◽  
Fatigue Loading ◽  
Numerical Approach ◽  
Delamination Growth ◽  
Paris Law ◽  
Load Carrying ◽  
Number Of Cycles ◽  
Delamination Front ◽  
Critical Aspects

One of the most critical aspects of composite structures is indeed associated to delamination phenomenon, especially with reference to their fatigue behavior. As a matter of facts, delaminations are strongly influenced by the fatigue induced degradation phenomena which can lead to a significant increase of delaminated area with the number of cycles, reducing the structural load carrying capability. In the present paper, an advanced numerical approach, very similar to the Paris Law formulation and based on the Energy Release Rate, is presented. The proposed formulation, in the frame of a geometrical non-linear analysis, is able to take into account the local damage accumulation along the delamination front in order to evaluate the delamination growth under fatigue loading conditions. In order to test the effectiveness of the proposed numerical approach, the fatigue behavior of a delaminated panel with a central hole has been simulated and the obtained numerical results have been compared with literature experimental results.

scholarly journals Computational Model for Delamination Growth at SMA-GFRP Interface of Hybrid Composite

2016 ◽  
Vol 2 ◽  
pp. 1538-1545 ◽  
Author(s):  
A. Lo Conte ◽  
C.A. Biffi ◽  
A. Tuissi ◽  
A. Ali
Keyword(s):  
Computational Model ◽  
Hybrid Composite ◽  
Delamination Growth
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