Journal ArticleDOI
Probabilistic multiconstraints optimization of cooling channels in ceramic matrix composites
TLDR
In this paper, the authors presented a computational reliable optimization approach for internal cooling channels in CMC under thermal and mechanical loadings using the Reliability Based Design Optimization (RBDO) approach.Abstract:
This paper presents a computational reliable optimization approach for internal cooling channels in Ceramic Matrix Composite (CMC) under thermal and mechanical loadings. The algorithm finds the optimal cooling capacity of all channels (which directly minimizes the amount of coolant needed). In the first step, available uncertainties in the constituent material properties, the applied mechanical load, the heat flux and the heat convection coefficient are considered. Using the Reliability Based Design Optimization (RBDO) approach, the probabilistic constraints ensure the failure due to excessive temperature and deflection will not happen. The deterministic constraints restrict the capacity of any arbitrary cooling channel between two extreme limits. A “series system” reliability concept is adopted as a union of mechanical and thermal failure subsets. Having the results of the first step for CMC with uniformly distributed carbon (C-) fibers, the algorithm presents the optimal layout for distribution of the C-fibers inside the ceramic matrix in order to enhance the target reliability of the component. A sequential approach and B-spline finite elements have overcome the cumbersome computational burden. Numerical results demonstrate that if the mechanical loading dominates the thermal loading, C-fibers distribution can play a considerable role towards increasing the reliability of the design.read more
Citations
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A review on optimization of composite structures Part I: Laminated composites
TL;DR: In this paper, the authors reviewed most of the studies carried out from 2000 on optimizing composite structures by representing a classification based on the type of structures and highlighted important parameters of these optimization approaches namely objective functions, design variables, constraints and the applied algorithms.
Journal ArticleDOI
An improved differential evolution based on roulette wheel selection for shape and size optimization of truss structures with frequency constraints
TL;DR: A novel differential evolution (DE) is proposed to solve the shape and size optimization problems for truss structures with frequency constraints withumerical results reveal that the proposed algorithm outperforms many optimization methods in the literature.
Journal ArticleDOI
Performance optimization of complicated structural SiC/Si composite ceramics prepared by selective laser sintering
TL;DR: In this article, the performance and microstructure of SiC/Si composites prepared by reaction-bonded (RB) process and selective laser sintering (SLS) method is investigated.
Journal ArticleDOI
Effect of matrix voids, fibre misalignment and thickness variation on multi-objective robust optimization of carbon/glass fibre-reinforced hybrid composites under flexural loading
TL;DR: In this article, the robust and optimal design of carbon/glass fiber-reinforced epoxy hybrid composite laminates under the constraint of a specified minimum flexural strength was investigated.
Journal ArticleDOI
A response surface approach for reliability analysis of 2.5D C/SiC composites turbine blade
TL;DR: In this paper, the performance of a 2.5D/SiC composites turbine blade is evaluated using Support Vector Machines (SVM) and new sample strategies are proposed to assess the failure domain and probability as well as reliability index with less computational cost and higher accuracy.
References
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Exact and Invariant Second-Moment Code Format
A. M. Hasofer,Niels C. Lind +1 more
TL;DR: In this article, a fundamental analysis of the meaning of second-moment reliability in multivariate problems is presented, and the format described is entirely derived from one basic assumption concerning the measurement of reliability.
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The COC algorithm, Part II: Topological, geometrical and generalized shape optimization
Ming Zhou,George I. N. Rozvany +1 more
TL;DR: In this paper, the COC algorithm is applied to the simultaneous optimization of the topology and geometry of trusses with many thousand potential members, and numerical results obtained are shown to be in close agreement with analytical results.
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A First Course in the Finite Element Method
TL;DR: In this paper, Galerkin's Stiffness matrix is used to measure the stiffness of a bar in a 3D-dimensional space using a 3-dimensional truss transformation matrix.
Journal ArticleDOI
Rotation free isogeometric thin shell analysis using PHT-splines
Nhon Nguyen-Thanh,Josef Kiendl,Hung Nguyen-Xuan,Roland Wüchner,Kai-Uwe Bletzinger,Yuri Bazilevs,Timon Rabczuk +6 more
TL;DR: A novel approach for isogeometric analysis of thin shells using polynomial splines over hierarchical T-meshes (PHT-splines) that achieves C1 continuity, so the Kirchhoff–Love theory can be used in pristine form.