5 research outputs found
Modelling Strategies for Predicting the Residual Strength of Impacted Composite Aircraft Fuselages
Aeronautic Certification rules established for the metallic materials are not convenient for the composite structures concerning the resistance against impact. The computerbased design is a new methodology that is thought about to replace the experimental tests. It becomes necessary for numerical methods to be robust and predictive for impact. Three
questions are addressed in this study: (i) can a numerical model be “mechanically intrinsic” to predict damage after impact, (ii) can this model be the same for a lab sample and a large structure, and (iii) can the numerical model be predictive enough to predict the Compression After Impact (CAI)? Three different computational strategies are used and compared: a Cohesive Model (CM), a Continuous Damage Model (CDM) coupling failure modes and
damage, and a Mixed Methodology (MM) using the CDM for delamination initiation and the
CM for cracks propagation. The first attempts to use the Smooth Particle Hydrodynamics
method are presented. Finally, impact on a fuselage is modelled and a numerical two-stage
strategy is developed to predict the CAI
A Novel Numerical Delamination Growth Initiation Approach for the Preliminary Design of Damage Tolerant Composite Structures
Modelling Strategies for Predicting the Residual Strength of Impacted Composite Aircraft Fuselages
A Linear Numerical Approach to Simulate the Delamination Growth Initiation in Stiffened Composite Panels
Forest plot of adjuvant radiotherapy (+/-) and overall survival and survival rate of small cell carcinoma of the cervix patients.
<p>(A) studies reporting hazard ratios; and (B) studies reporting odds ratios. SE: standard error; CI: confidence interval.</p