In order to research the mechanical behavior of unidirectional triangle-section carbon fiber reinforced plastics (TCFRP), the composite was manufactured using the filament winding process, with a fiber volume fraction...
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The indentation-quench method for investigating surface crack propagation has been studied through both experiments and model. The influential factors for surface crack propagation such as specimen thickness, thermal ...
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The indentation-quench method for investigating surface crack propagation has been studied through both experiments and model. The influential factors for surface crack propagation such as specimen thickness, thermal fatigue property, and quench temperature difference（?T） and one single specimen being used throughout a whole test ?T were surveyed in this paper. Practical results were obtained for ZrB-20%Si C-10%Al N（ZSA） ultra-high temperature ceramic. The percentage crack growth versus ?T curves showed stable crack growth in a relative low ?T interval and unstable crack growth above a certain ?T, and these regimes were sensitive to the thickness. The total stress intensity factor（K） combining residual stress and thermal stress considering dynamical behavior during the quenching test was calculated by a surface crack theoretical model, the result of calculation was analyzed influential factors and crack propagation.
The molecular mechanism has been employed to model the structure-property relationships of auxetic material with tetrahedral framework at the atomistic level. The germania α-quartz subject uniaxial stress loading in ...
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The molecular mechanism has been employed to model the structure-property relationships of auxetic material with tetrahedral framework at the atomistic level. The germania α-quartz subject uniaxial stress loading in z direction will be investigated. The strain-dependent structure and mechiancal properties will be predicted from the force field based simulations, including the transformation from positive-to-negative Poisson's ratio behaviour and vice versa.
It is very important for gas-structure interaction between compressible ideal gas and elastic structure of space folded membrane booms during the inflatable deployment. In order to study this gas-structure interaction...
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It is very important for gas-structure interaction between compressible ideal gas and elastic structure of space folded membrane booms during the inflatable deployment. In order to study this gas-structure interaction problem, Arbitrary Lagrangian-Eulerian （ALE） finite element method was employed. Gas-structure interaction equation was built based on equilibrium integration relationship, and solved by operator split method. In addition, numerical analysis of V-shape folded membrane booms inflated by gas was given, the variation of inner pressure as well as deployment velocities of inflatable boom at different stage were simulated. Moreover, these results are consistent with the experiment of the same boom~ which shows that both ALE method and operator split method are feasible and reliable methods to study gas-structure interaction problem.
Saddle point problems have been widely applied to many engineering areas such as fluid dynamics, constrained and weighted least squares estimation, electrical circuits and networks, electromagnetics, image registratio...
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Saddle point problems have been widely applied to many engineering areas such as fluid dynamics, constrained and weighted least squares estimation, electrical circuits and networks, electromagnetics, image registration, and mesh generation for computer graphics. In this paper, we propose a nongeneric algorithm to solve a class of nonlinear saddle point problems. Under weak conditions, we obtain the global convergence results of this new algorithm, whose initial points can be chosen more easily than the locally convergent algorithms. We also analyze in detail the implementation of the algorithm in practice.
Multi-objective decision-making problems have been widely applied to business, financial investment, transportation, optimal routing design, environment protection, and military strategies. In this paper, we give a no...
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The method for calculating the displacement of the flexible skin under the air loads is developed based on the panel method and the finite element method. Numerical results show that the flexible skin on the upper sur...
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The method for calculating the displacement of the flexible skin under the air loads is developed based on the panel method and the finite element method. Numerical results show that the flexible skin on the upper surface of the trailing edge will bubble under the air loads and the bubble has a great effect on the aerodynamic pressure near the surface of the local deformation. Then, the relationships between the deformation of flexible skin and its parameters such as elastic modulus, thickness and pre-strain are discussed. It can be seen that the displacement of flexible skin firstly increases and then decreases with the increasing flap angle of trailing edge. To increase the skin thickness can reduce the minimum elastic modulus and the minimum tensile stiffness. But the skin thickness is limited by the space of wing structure. The minimum tensile stiffness based on the Jacobs rules will reduce with the increasing pre-strain acting in the flexible skin.
The lightweight inflatable solar array is a new kind of solar array deployed by its inflatable booms. The researches on solar arrays were concisely reviewed, and then a model of segmented inflatable control volume for...
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