damage tolerance in composite structures

... seedlings on normal Murashige and Skoog (MS) plates and in a medium containing 100 lM K+ (LK) The steady-state flux profile of K+ was examined by continuous flux recording (5–10 min) Each point indicates ... Histochemical staining indicated that AtHELPS is mainly expressed in the young seedlings and vascular tissues of leaves and roots Using both helps mutants and overexpression lines, we observed that, in the ... progress in determining the molecular mechanism of the regulation of K+ uptake in plants has been made [10,11,40] AKT1 was first reported to be expressed in roots and involved directly in the mineral

Ngày tải lên: 14/02/2014, 18:20

... method of increasing strength without increasing carbon and alloy content is controlled rolling combined with on-line accelerated cooling, i.e. thermo-mechanical controlled processing (TMCP). ... which will depend on the types of structures the individuals having in mind, the desired levels of performance and the performance of structures built according to the present practice. No attempt, ... nominal bending strength of compact girder cross-sections, indicated by the dashed line with squares; and (3) design considering strength, stability, and fatigue indicated by the solid line

Ngày tải lên: 07/07/2014, 06:20

... INTRODUCTION Until the 1960's, the teaching and practice of structural engineering consisted mainly of understanding the underlying principles, then learning hand methods and practising ... post-tensioned strands. With continued loading, yielding will develop in the tension angles, which will cause further softening of the connection. Full yielding and strain hardening of the tension angles ... against data errors and an inappropriate choice of computer program. Therefore methods previously obtained to give insight, such as the Principle of Multiples, remain valuable instruments in

Ngày tải lên: 07/07/2014, 06:20

... buckling in polygonal columns, however, are found in the literature. The local buckling of long polygonal tubes in combined bending and torsion was investigated by Wittrick and Curzon (1968) using ... spring are determined by using curve- fitting technique, based on the in-plane restoring force-displacement hysteretic relation at the top of the column obtained by FEM analysis. By properly increasing ... by FEM analysis. By properly increasing the number of springs, the homogeneity of thin-walled circular columns is maintained. Finally this model is used in three-dimensional earthquake response

Ngày tải lên: 07/07/2014, 06:20

... Cross-Sectional Analysis and Finite Strip Buckling Analysis of Thin Walled Structures: Users Manual- Version 1.2, Centre for Advanced Structural Engineering, Department of Civil Engineering, The University ... columns, flexural buckling, strengthen steel plates, ultimate load capacity INTRODUCTION Due to increasing loads or changing of service conditions sometimes members of existing structures must be ... columns with pinned ends on both sides (Figure 1). In the following only axial loading (constant axial force N) is taken into account. Additional limited bending moments can be also taken into account

Ngày tải lên: 07/07/2014, 06:20

... multinomial. The damping force in the system is nonlinear. Considering material and geometric nonlinearity, nonlinear governing equation of the system is derived. By use of nonlinear Galerkin ... CHAOTIC BELT PHENOMENA IN NONLINEAR ELASTIC BEAM" Zhang Nianmei 1 Yang Guitong 2 Xu Bingye ~ 1 Department of Engineering Mechanics, Tsinghua University, Beijing, China 2 Institute of Applied ... of influence factors. Therefore the influence of the welding process on the load capacity is estimated in an engineering manner. Following the Europian buckling curves the effect of welding

Ngày tải lên: 07/07/2014, 06:20

... Chaos of Nonlinear Elastic Beam. J. Nonlinear Dynamic 3:2, 265-274.(in Chiness) Frames and Trusses This Page Intentionally Left BlankThis Page Intentionally Left BlankThis Page Intentionally ... holding down bolts and also the bearing resistance of the foundation. The present research program is aiming at defining this moment of resistance in simple design terms so that it could be included ... in order to determine whether or not they were in contact. The holding down bolts were modelled by line elements following the stress-strain characteristic which was obtained from a separated

Ngày tải lên: 07/07/2014, 06:20

... A spring is employed for simulation of yielding and the formation of plastic hinge When no yielding occurs, the spring stiffness is infinite and, when a plastic hinge is formed, the spring stiffness ... behaviour However, it is often treated in a non-linear analysis as proportional loads for simplicity, which contains a certain degree of uncertainty in accuracy In this paper, the effects of load ... stiffness at the strain-hardening stage; a is the scaling factor; and Cj are the curve-fitting constants given in Lui and Chen (1988) NUMERICAL PROCEDURE For non-proportional loading, the Newton-Raphson

Ngày tải lên: 07/07/2014, 06:20

... KEYWORDS Rosette-joint, truss testing, light-weight steel, roof truss, cold-formed steel, steel sheet joining. INTRODUCTION The Rosette-joining system is a completely new press-joining method for ... practical in engineering design practice. In this paper, a refined-plastic-hinge model is proposed and studied. 151 152 P. P T. Chui and S L. Chan FUNCTIONS OF YIELD SURFACES In the present refined-plastic-hinge ... & Structural Engineering, The Hong Kong Polytechnic University, HONG KONG ABSTRACT A second-order refined-plastic-hinge method for determining the ultimate load-carrying capacity of steel

Ngày tải lên: 07/07/2014, 06:20

... joint perimeter. The joining process is illustrated in Figure 1 and the finished Rosette-joint is shown in Figure 2. Figure 1: Rosette-joining process Figure 2: The Rosette-joint DESCRIPTION OF ... steadily increased up to 25.16 kN, where it was held for one hour. The nonlinearities in the curve during load increase were caused by the movement in the joints due to production tolerances. Point ... slight beginning of local deformations could be seen in the chord members in the area of the most heavily loaded joints, i.e. beginning shear deformations like the ones portrayed in Figure

Ngày tải lên: 07/07/2014, 06:20

... yielding and shear buckling. Evaluate plastic and damage progress Considering strength decrease governed by local buckling, the strength function for Zone I defined in Eqn. 3 for plus and minus ... presents the nonlinear inelastic models that can be used for analysing space frame structures within the context of advanced inelastic analysis. In the proposed approach, each steel framing member ... combination of gravity loads and wind loads that act in the Y-direction. Core-walls are mainly subjected to the bending moment about the principle ~- Advanced Inelastic Analysis of Spatial Structures

Ngày tải lên: 07/07/2014, 06:20

... distributed moments along the substituting column are induced from deformation of the framework during buckling. In doing so, the framework is converted into a fixed-free column on which a distributed ... phenomenon is not shown in substituting column. Comparing actual column with substituting column, it is known that the restraint moment acting at floor level due to beam bending makes the column ... each floor level. According to preceding procedure, the substituting column is shown in Fig. 3. lb. When the framework buckles, it can be in equilibrium both in original configuration (undeformed

Ngày tải lên: 07/07/2014, 06:20

... energy for a single generator  Eint Rate of the internal work Fe Force in the elastic stage defined in Eq (2.5) Fm Force in the membrane stretching stage defined in Eq (2.7) Fp Force in the plastic ... pipe -in- pipe composite structures have recently emerged as a popular solution to enhance the structural resistance against external loadings Engineering applications of such composite structures in ... pipelines against impact loadings has become an important concern in engineering as external impact loadings are a primary threat and a frequent cause of damage in onshore and offshore pipelines...

Ngày tải lên: 09/09/2015, 11:10

... 1: Introduction and Literature Review delamination in composite laminates In the mesomodel, a laminate is modeled as a stack of homogeneous elastic layers and interlaminar interfaces The interface ... load-carrying capacity and reflect the general damage state Hence, there should be savings in computational efforts since each change in damage state is achieved by modifying modal forces of damaged ... modeling progressive damage in composite structures, International Journal of Damage Mechanics (accepted) Tay, T.E., Tan, V.B.C and Liu, G (2006), A new integrated micro-macro approach to damage...

Ngày tải lên: 12/09/2015, 08:19

... //end insertInPlace   11 Chapter ■ Sorting, Searching, and Merging Using insertInPlace, we can rewrite insertionSort (calling it insertionSort2) as follows:   void insertionSort2(int list[], int ... using the generic parameter, list:   void selectionSort(int list[], int lo, int hi) { //sort list[lo] to list[hi] in ascending order int getSmallest(int[], int, int); void swap(int[], int, int); ... lo, int hi) { //sort list[lo] to list[hi] in ascending order void insertInPlace(int, int [], int, int); for (int h = lo + 1; h

Ngày tải lên: 19/03/2014, 14:11

... with SPO11, a protein involved in inducing double-strand breaks to initiate meiotic recombination in eukaryotes [8,9] Their existence has also been shown in plants [10–14] In contrast with other ... The amino-acid sequence analysis of rice TOP6 proteins also predicted several potential putative phosphorylation sites for casein kinase II, protein kinase C, tyrosine kinase, histidine kinase, ... GAL4 DNA-binding domain, respectively The interaction of BD-53 (fusion of p53 with GAL4 DNA-binding domain) with AD-T (fusion of antigen T with activation domain) and AD-Lam (fusion of lamin C with...

Ngày tải lên: 30/03/2014, 10:20

... merge(int[] A, int m, int[] B, int n, int[] C) { int i = 0; //i points to the first (smallest) number in A int j = 0; //j points to the first (smallest) number in B int k = -1; //k will be incremented ... newItem; } //end insertInPlace   Using insertInPlace, we can rewrite insertionSort (calling it insertionSort2) as follows:   public static void insertionSort2(int list[], int lo, int hi) { //sort ... main(String[] args) { Scanner in = new Scanner(System .in) ; int[] num = new int[MaxNumbers]; System.out.printf("Type up to %d numbers followed by 0\n", MaxNumbers); int n = 0; int v = in. nextInt();...

Ngày tải lên: 07/04/2014, 15:00

... in main memory instead of residing primarily on disk (e.g [20]) Years ago, main memory capacity was the factor limiting the appeal of main memory DBMSs In high-end systems today, however, main ... errors Error checking is not usually done systematically The checking code has to be maintained as the software it checks is maintained Implementing and testing error checkers increases development ... comparing results and voting to resolve conflicts In theory, the independent programs will fail independently In practice, multiple version failures are caused by errors in common tools, errors in...

Ngày tải lên: 28/04/2014, 13:32

... Engineering Software CAD Composite Structures Computer Methods in Applied Mechanics & Engineering Computers and Structures Construction and Building Materials Engineering Failure Analysis Engineering ... Engineering Failure Analysis Engineering Fracture Mechanics Engineering Structures Finite Elements in Analysis and Design International Journal of Solids and Structures International Journal of Fatigue ... Australia Australia UK Taiwan, China France Japan Australia Czech Republic China China Singapore China China USA China USA Czech Republic Japan UK UK J.A Packer, S Pellegrino, E.P Popov, J Rhodes, J.M...

Ngày tải lên: 07/07/2014, 06:20