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Shi X.,The Sixtieth Institute of the Headquarters of the General | Chen H.,Nanjing University of Aeronautics and Astronautics | Zhou G.,Nanjing University of Aeronautics and Astronautics | Wang X.,Nanjing University of Aeronautics and Astronautics | Feng W.,Nanjing University of Aeronautics and Astronautics
Nanjing Li Gong Daxue Xuebao/Journal of Nanjing University of Science and Technology | Year: 2014

In order to study the influence of overlap length and thickness on the bending of bilateral butt joint, the software Abaqus is used for the progressive damage analysis. The method is built based on the three-dimensional progressive damage analysis(PDA)and the cohesive zone model(CZM). The constitutive equations for composite programmed by User-defined Material Mechanical Behavior(UMAT)subroutine and Cohesive Contact method are used to simulate respectively the damage progression in composites and that in the adhesive interface. The bending strength and damage process of joints are obtained. The results show, the strength of joints can be increased with the increase of the overlap length and may change little when the length reaches a definite value. But its strength increases at the beginning and decreases with increasing the overlap thickness. The results can provide reference material for the design of joints during bending.


Jiang N.,Nanjing University of Aeronautics and Astronautics | Jiang N.,The Sixtieth Institute of the Headquarters of the General | Ni J.,Nanjing Southeast University | Zhou G.,Nanjing University of Aeronautics and Astronautics | And 3 more authors.
Transactions of Nanjing University of Aeronautics and Astronautics | Year: 2013

A high cycle fatigue reliability analysis approach to helicopter rotor hub is proposed under working load spectrum. Automatic calculation for the approach is implemented through writing the calculating programs. In the system, the modification of geometric model of rotor hub is controlled by several parameters, and finite element method and S-N curve method are then employed to solve the fatigue life by automatically assigned parameters. A database between assigned parameters and fatigue life is obtained via Latin Hypercube Sampling (LHS)on rotor hub's tolerance zone. Different data-fitting technologies are used and compared to determine a highest-precision approximation for this database. The parameters are assumed to be independent on each other and follow normal distributions. Fatigue reliability is then computed by the Monte Carlo (MC) method and the mean-value first order second moment (MFOSM) method. Results show that the approach has a high efficiency and a high precision, and is suited for engineering application.

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