Initiation and Accumulation of Damage in Composite Laminates

2009 ◽  
pp. 163-163-20 ◽  
Author(s):  
RS Sandhu ◽  
RL Gallo ◽  
GP Sendeckyj
Keyword(s):  
Composite Laminates ◽  
Accumulation Of Damage

Control of Damage in Composite Laminates by Ply-Stacking Designs: Characteristic Failure Signatures and Safety Criteria

2003 ◽  
Vol 125 (4) ◽  
pp. 385-393
Author(s):  
Vasyl Michael Harik
Keyword(s):  
Composite Laminates ◽  
Damage Mechanics ◽  
Three Dimensional ◽  
Cumulative Damage ◽  
Failure Behavior ◽  
Safety Criterion ◽  
Damage And Failure ◽  
Incremental Formulation ◽  
Accumulation Of Damage ◽  
Safety Features

Structural designs for composite laminated systems can be optimized for a fail-safe in-service performance by introducing the built-in cumulative-damage-indicators for the progressive degradation of material properties. This design methodology is based on the concepts of the characteristic failure signature (CFS), cumulative-damage states and a load-drop sequence that characterize the stress-strain response and progressive accumulation of damage. The cumulative damage mechanics is based on the three-dimensional laminate analysis that is used to predict nonlinear response of composites, accumulation of damage and failure behavior. An earlier-developed nonlinear analysis involves an incremental formulation that couples the three-dimensional laminate analysis with a progressive ply-failure methodology, which has been tested in the World-Wide Exercise on Composites Failure Theories. The failure signatures are shown to have unique “safety features” that depend on the ply stacking sequence and predominant loading. To refine the analysis of micromechanical damage a model for the macro-to-micro coupling is introduced. Various examples of failure envelopes, characteristic failure signatures, a safety criterion and the “safe” CFSs that lead to the desired controlled failures are discussed for symmetric balanced laminates.

Failure Prediction of Graphite/Epoxy Laminates With Induced Intermittent Surge in Applied Load During Fatigue

2001 ◽  
Author(s):  
Diwakar N. Kedlaya ◽  
Assimina A. Pelegri
Keyword(s):  
Numerical Simulation ◽  
Energy Release Rate ◽  
Energy Release ◽  
Release Rate ◽  
Composite Laminates ◽  
Damage Accumulation ◽  
Applied Load ◽  
Damage Growth ◽  
Mode Mixity ◽  
Accumulation Of Damage

Abstract An analytical model, backed by numerical simulation, describing the behavior of the energy release rate of composite laminates subjected to fatigue overloads is presented. The model establishes that accumulation of damage due to intermittent surge in applied load reduces the energy release rate, G, of the material. Thus, in the case of cyclic loading with overloads, it is essential to model the failure using a damage growth law that incorporates the damage accumulation due to the overloads. The results obtained in this study, have no restrictive assumptions regarding the specimen or the delamination thickness, T and h respectively, and are presented over varying mode-mixity and h/T ratios.

Reliable Bonding of Composite Laminates Using Reflowable Epoxy Resins

2019 ◽  
Author(s):  
Frank Palmieri ◽  
Tyler Hudson ◽  
Roberto Cano ◽  
Erik Tastepe ◽  
Dean Rufeisen ◽  
...  
Keyword(s):  
Composite Laminates ◽  
Epoxy Resins

Micromechanics-based predictive model for compressively loaded angle-ply composite laminates

AIAA Journal ◽  
2000 ◽  
Vol 38 ◽  
pp. 2299-2304
Author(s):  
Jung Hyun Ahn ◽  
Anthony M. Waas
Keyword(s):  
Predictive Model ◽  
Composite Laminates
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