Three dimensional failure analysis of pin jointed composite laminates

Experimental and numerical failure analysis of advanced composite structures with holes Atar, Mehmet Bilal; Parnas, Kemal Levend; Department of Mechanical Engineering (2016) In this work, a design methodology for advanced composite structures with holes is presented. A three dimensional finite element model (FEM) is constructed to simulate such a structural application similar to weight-pockets in helicopter blades. Material properties are obtained by a material characterization study. The progressive failure method with FEM is used for the material degradation. In order to induce delamination in simulation, cohesive layers are implemented between composite layers. Results are ...
Failure analysis of thick composites Erdem, Melek Esra; Parnas, Kemal Levend; Department of Mechanical Engineering (2013) A three-dimensional finite element model is constructed to predict the failure of a hybrid and thick laminate containing bolted joints. The results of the simulation are compared with test results. The simulation comprises two main challenging steps. Firstly, for a realistic model, a 3D model is established with geometric nonlinearities and contact is takeninto account. The laminated composite model is constructed by 3D layered elements. The effect of different number of elements through the thickness is in...
Failure analysis of tapered composite structures under tensile loading Çelik, Ozan; Parnas, Kemal Levend; Department of Mechanical Engineering (2016) A three dimensional finite element modeling approach is used to evaluate the effects of preliminary design variables on the performance of tapered composite laminates under tensile loading. Hashin failure criteria combined with a progressive failure algorithm is used for in-plane failure mechanisms and cohesive zone method is used for out-of-plane failures. The modeling approach is validated by a comparison with experimental results from literature. The validated model is used to examine various design vari...
Finite element modeling of micro particle separation using ultrasonic standing waves Süleyman, Büyükkoçak; Çetin, Barbaros; Özer, Mehmet Bülent (2014-08-07) Acoustophoresis which means separation of particles and cells using acoustic waves is becoming an intensive research subject. The method is based on inducing an ultrasonic compression standing wave inside a microchannel. A finite element approach is used to model the acoustic and electro-mechanical behavior of the piezoelectric material, the micro-channel geometry as well as the fluid inside the channel. The choices of silicon and PDMS materials are investigated as the chip materials for the resonator. A se...
Comparative study of finite element analysis and geometrically exact beam analysis of a composite helicopter blade Ataç, Meryem Nisa; Kayran, Altan; Department of Aerospace Engineering (2018) In this master thesis, comparative study of the finite element analysis and geometrically exact beam analysis of a composite helicopter blade is performed. The objective of this study is to investigate the applicability of the geometrically exact beam analysis of the composite helicopter blade in predicting the structural response of the composite blade. To evaluate the structural response determined by the geometrically exact beam analysis of the composite blade, detailed finite element model of the blade ...

Citation Formats

A. Evcil, “Three dimensional failure analysis of pin jointed composite laminates,” Ph.D. - Doctoral Program, Middle East Technical University, 2000.