Cyclic behavior of unidirectional and cross-ply titanium matrix composites

Date

1996-01-01

Author

Neu, R.W.
Çöker, Demirkan
Nicholas, T.

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

173
views

0
downloads

Relatively simple and efficient micromechanical models are used to obtain the uniaxial response of SCS-6/Timetal 21S with [0](4) and [0/90](s) laminates when subjected to isothermal and thermomechanical fatigue (TMF) loadings. Features of the modeling that are required to obtain the accurate deformation behavior for this class of materials under these loadings are highlighted. To this end, a comparison is made between the concentric cylinder model and the uniaxial stress model for representing the [0] laminate. The axial stresses from the two models are very similar under mechanical loading. The greatest differences appear under thermal loading alone. The differences on the composite response between a lime-independent elastic-plastic and a viscoplastic matrix constitutive model are also examined. The latter is based on the Bodner-Partom unified constitutive model. The [0/90] laminate is treated by adding a parallel element with smeared [90] ply properties to the [0] model and invoking axial strain compatibility as well as stress equilibrium. The proposed constitutive law for the [90] ply includes both matrix viscoplasticity and fiber/matrix separation damage and is based on damage mechanics concepts. The effect of cyclic frequency on TMF behavior is examined. The in-phase TMF life is shown to be very sensitive to frequency due to the relaxation of matrix stress and the attendant increase in fiber stress.

Subject Keywords

Model, Plasticity, Damage, Residual-stresses, Inelastic deformation

URI

https://hdl.handle.net/11511/36340

Journal

International Journal of Plasticity

DOI

https://doi.org/10.1016/s0749-6419(96)00012-5

Collections

Department of Aerospace Engineering, Article

Suggestions

OpenMETU
Core

Numerical implementation of magneto-acousto-electrical tomography (MAET) using a linear phased array transducer GÖZÜ, Mehmet Soner; ZENGİN, Reyhan; Gençer, Nevzat Güneri (2018-02-01) In this study, the performance and implementation of magneto-acousto-electrical tomography (MAET) is investigated using a linear phased array (LPA) transducer. The goal of MAET is to image the conductivity distribution in biological bodies. It uses the interaction between ultrasound and a static magnetic field to generate velocity current density distribution inside the body. The resultant voltage due to velocity current density is sensed by surface electrodes attached on the body. In this study, the theory...
Steady-state modeling of a phase-shift PWM parallel resonant converter Iskender, Ires; Uctug, Yildurum; Ertan, Hulusi Bülent (2006-01-01) Purpose - To derive an analytical model for a dc-ac-dc parallel resonant converter operating in lagging power factor mode based on the steady-state operation conditions and considering the effects of a high-frequency transformer.
Verification of delay insensitivity in bit-level pipelined dual-rail threshold logic adders Ismailoglu, A. Neslin; Askar, Murat (2008-02-22) A delay-insensitivity verification method is proposed for bit-level pipelined systolic dual-rail threshold logic adders, which achieve speed-up through early and input-incomplete carry output generation and which employ bit-wise completion at pipeline registers. The proposed method simplifies the verification task significantly, regardless of the operand length of the adder, such that analysis of three adjacent systoles for the eight possible early/late carry output generation scenarios is sufficient for de...
Lattice dynamical and thermo-elastic properties of M2AlB (M = V, Nb, Ta) MAX phase borides Surucu, Gokhan; Gencer, Ayşenur; Wang, Xiaotian; Surucu, Ozge (Elsevier BV, 2020-04-05) The structural, electronic, dynamic, and thermo-elastic properties of M2AlB (X = V, Nb, Ta) MAX phase borides were investigated using first principle calculations as implemented in the Vienna Ab-initio Simulation Package (VASP) with the generalized gradient approximation (GGA). The obtained structural properties and formation energies showed the thermodynamic stability and synthesizability of M2AlB. The electronic band structures were determined and they revealed that these compounds had a metallic characte...
Accurate equivalent models of sandwich laminates with honeycomb core and composite face sheets via optimization involving modal behavior Cinar, Okan; Erdal Erdoğmuş, Merve; Kayran, Altan (2017-03-01) An approach is introduced for determining accurate two-dimensional equivalent laminated models of sandwich laminates with honeycomb core and composite facesheets by optimization involving modal behavior. The approach relies on minimizing the objective function which is defined as the sum of the square of the differences between the natural frequencies of the honeycomb sandwich laminate estimated by the finite element analysis of the 3D detailed model with the actual honeycomb core geometry and by the 2D equ...

Citation Formats

R. W. Neu, D. Çöker, and T. Nicholas, “Cyclic behavior of unidirectional and cross-ply titanium matrix composites,” International Journal of Plasticity, pp. 361–385, 1996, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/36340.