Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 86 for “"STIFFENERS"”.
-
Behaviours of steel connections with unfitted stiffeners
… A critical issue arises when gaps exist between stiffeners and connected elements, referred to as unfitted stiffeners, which introduce uncertainties in the load-bearing capacity and deformation behaviour of these vital connections. This problem potentially compromises structural safety and leads …
-
Vibro-acoustic optimization of panel with curvilinear stiffeners
… complex shapes such as panels with curvilinear stiffeners. Designing and optimizing stiffened panels with predefined structural and acoustic response is the focus of this dissertation. Researchers have dealt with sizing optimization of panels with straight/curvilinear stiffeners for many years …
-
Assessing possible economic or operational benefits of class 3 webs without stiffeners vs class 4 webs with stiffeners in steel plate girders
… stresses with thick web plates and no web stiffeners has economical or operational benefits than adoption of plate girder cross-sections with slender web plates reinforced with intermediate transverse stiffeners. The research focuses mainly on optimisation for bending moment resistance. …
-
Variable complexity modeling of postbuckled stiffeners for delamination initiation
… components. Analyses are performed for I-section stiffeners and for a dropped-ply laminate, all of which failed due to free edge delamination in earlier experimental studies. These specimens were made of AS4/3502 graphite-epoxy unidirectional tape. The nonlinear response of the specimens is …
-
Failure and crippling of graphite-epoxy stiffeners loaded in compression
Results of an experimental study of the failure and crippling of thin-walled open section prismatic compression members are presented. Twenty-four specimens were tested, 13 of which were channel sections and the other 11 were zee sections. Three specimens were made of 2024-T3 aluminum. The …
-
Scale effects in buckling, postbuckling and crippling of graphite-epoxy Z-section stiffeners
… of graphite-epoxy laminated composite Z-section stiffeners subjected to uniaxial, compressive loading has been evaluated. The response regimes investigated are prebuckling, initial local buckling, postbuckling and crippling. A mechanistic approach to scaling has been used, in which the …
-
Influence of ring stiffeners and prebuckling deformations on the buckling of eccentrically stiffened orthotropic cylinders
… homogeneous orthotropic material with eccentric stiffeners on its surface. The rings, or circumferential stiffeners, are considered to be located discretely on circumferential lines along the length of the cylinder and the stringers, or longitudinal stiffeners, are considered to be closely spaced …
-
Analysis of the Behavior of Steel Silos Under Wind Loading (Buckling, Stiffeners, Corrugated Shell, Anchor Bolts)
This study deals with the linear elastic analysis and the linearized buckling analysis of steel silos under wind loading. In the first part, the wind loading pattern is established and the equivalent orthotropic rigidities of standard corrugated sheets are reviewed and, in some cases, new improved …
-
Optimizing the arrangement of truss members or the stiffeners of plated plane panels under inplane loads.
Massachusetts Institute of Technology. Dept. of Ocean Engineering. Thesis. 1971. M.S.
-
Optimally stiffened thin shell structures in 3D printing.
… shell contribution. The advantages of attaching stiffeners seamlessly to skin surface are: • Stiffeners can alleviate interior space compared to insertion of struts or Voronoi structure; • Stiffeners are less likely to cause stress concentration compared to skin- frame structure which connects …
-
Control of Radiated Noise from Fluid-Loaded Stiffened Structures
… structure and flexural/torsional waves in the stiffeners. These waves are a primary source of undesirable noise and vibrations when a stiffened structure is excited by a force. Hence, this work aims to understand the propagation of BF waves and their contribution to the radiated sound power by …
-
Buckling Analysis of Composite Stiffened Panels and Shells in Aerospace Structure
Stiffeners attached to composite panels and shells may significantly increase the overall buckling load of the resultant stiffened structure. Initially, an extensive literature review was conducted over the past ten years of published work wherein research was conducted on grid stiffened composite …
-
Stiffener Design for Beam-to-Column Connections
Stiffeners are used as a means of providing additional support to columns at beam connection locations. They are added when the strength of the column is exceeded but full moment strength of the beam section is desired. In determining the design of column stiffeners, there are no specifications for …
-
Estabilidade local de painéis cilíndricos enrijecidos
… compression are presented. The effects due to stiffeners spacing and slenderness as well as modal interaction and inicial geometric imperfections are investigated. It is shown that the use of slender stiffeners as suggested by the orthotropic theory, can lead to interaction between local and …
-
Structural analysis of geodesically stiffened composite panels with variable stiffener distribution
… and out-of-plane bending stiffnesses of the stiffeners through the use of Lagrange multipliers in an energy method solution. The analysis is used to isolate the effect of various stiffener deformation modes on the buckling load and skin deformation patterns of geodesically stiffened panels …
-
Finite element analysis of geodesically stiffened cylindrical composite shells using a layerwise theory
… geodesically stiffened shells with discrete stiffeners. This method utilizes a Lagrange multiplier technique to attach the stiffeners to the shell. The development of the layerwise shells couples a one-dimensional finite element through the thickness with a Navier solution that satisfies the …
-
Multidisciplinary Optimization and Damage Tolerance of Stiffened Structures
… wing with curvilinear spars and ribs and stiffeners is described. The design concept of reinforcing the wing structure using curvilinear stiffening members has been explored due to the development of novel manufacturing technologies like electron-beam-free-form-fabrication (EBF3). For the …
-
Um modelo matemático para estabilidade elástica de cascas cilíndricas enrijecidas
… for an isotropic thin cylindrical shell. The stiffeners are assumed to be widely spaced discret slender elements and their torsional stiffness are taken into account. The modelling considers, in a consistent way, the coupling between all essential displacements modes - from shell and …
-
Passive Damping in Stiffened Structures Using Viscoelastic Polymers
… in a thick stiffened panel with plate-strip stiffeners, to enhance the damping characteristics of the structure. First, we investigated complex damped modes in beams in the presence of a viscoelastic layer sandwiched between two elastic layers. The problem was solved using two approaches, (1) …
-
Array processing and forward modeling methods for the analysis of stiffened, fluid-loaded cylindrical shells
… shell stiffened with four unequally spaced ring-stiffeners and a duplicate ribbed shell augmented by resiliently-mounted, wave-bearing, internal structural elements. Array and signal processing techniques, including source deconvolution, array weighting, conventional focusing and the removal of …
Page 1 of 5