... demonstrated. The use of an FE-based plate model to simulate delamination growth due to sublaminate buckling and panel skin buckling in stiffened panels after impact is described. Skin buckling causes a steep increase in delamination strain energy release rate and should be prevented. buckling carbon...

.... Residual strength analyses made on 2024-T3 alloy (1.6-mm thick) riveted-lap-splice joints with a lead crack and various-size MSD cracks were compared with test data from Boeing. Analyses were conducted for both restrained and unrestrained against buckling conditions. Comparison of these analyses with lap...

... The purpose of this paper was to verify the capability of the STAGS (general shell, geometric and material nonlinear) code and the critical crack-tip-opening angle (CTOA) fracture criterion to predict stable tearing in cracked panels that fail with severe out-of-plane buckling. Materials...

... This paper examines the creep buckling response of asymmetric composite beam columns under general loading conditions. The material properties of the laminates are defined by the constitutive equations of the linear viscoelastic theory. The problem is formulated in terms of convolution integral...

... method composite materials finite-element analysis buckling stress concentrations compressive failure compression testing Seng C. Tan Land M. Knight2 An Extrapolation Method for the Evaluation of Compression Strength of Laminated Composites REFERENCE: Tan, S. C. and Knight, M., "An Extrapolation...

... presents a design methodology that may be used for such applications. The design methodology considers both the ring-directed and the axial-directed effects of the applied earth pressure. Ring loads subject the manhole wall to compressive strains which, if not limited, can cause buckling. These loadings...

... Compressive buckling of hollow cylinders due to internal pressure is a little-known phenomenon that can affect pressure testing of plastic pipe. High strength pipe materials with large dimension ratios particularly exhibit the phenomenon, but it can also occur in pipe with low dimension ratios...

... This research studied the effects of an inserted circular delamination on the strength of an eight-ply, quasi-isotropic composite laminate. Cylindrical panels were loaded compressively, and the global buckling load of the delaminated plies were examined. It was found that, for the level...

... Local buckling of a delaminated group of plies can lead to high interlaminar stresses and delamination growth. The mechanics of instability-related delamination growth (IRDG) had been described previously for the through-width delamination. This paper uses the results of finite-element analyses...

... the different types of loading and support conditions. Finally it is stated where the weak parts are and what should be done to modify it for flexible gravity and pressure pipes. flexible pipe static calculation load condition design buckling Hubert Schneider ATV A 127 -- AS IT RELATES TO PLASTIC...

... of these properties for analyzing pipe deflection, wall thrust and buckling strength are indicated. soil properties stress-strain behavior strength compaction flexible pipe plastic pipe Young's modulus Poisson's ratio bulk modulus constrained modulus deflection buckling wall thrust Ernest T...

... A buckling theory for design of buried plastic pipes is described, which combines linear shell stability theory for the structure with elastic continuum analysis for the assessment of ground support. The theory provides stability estimates which are superior to those generated using ‘spring...

... A unique dynamic delamination buckling and delamination propagation analysis capability has been developed and incorporated into a finite-element computer program. This capability consists of (1) a modification of the direct time integration solution sequence which provides a new analysis...

... closure resulted in predicted rates being too high in some cases. delamination fatigue growth rate mixed mode compression buckling graphite/epoxy interlaminar Alan J. Russell t and Ken N. Street t Predicting Interlaminar Fatigue Crack Growth Rates in Compressively Loaded Laminates...

... When using slender beams as compression load-carrying members, one has to consider the risk of buckling failure. Apart from cross-sectional properties, length of the beam, and elastic properties, the initial lateral deflection and the boundary conditions will be important in determining...

..., data on delamination depth are rarely available. However, it was found that by assuming a delamination interface that results in the lowest failure strain, correlation with test data was obtained. composite materials impact delamination defects buckling fracture mechanics laminates Gerry...

... growth rates, even at identical stress intensity factor ranges. This result is explained in terms of the difference in the nonsingular component of stress, parallel to the crack faces, which influences both the plastic zone size, and, in the case of very thin specimens, the buckling behavior...

... Elastic buckling loads for laminated composite circular cylindrical shells subject to combined compression and torsion are determined experimentally. Test specimens include both boron/epoxy and graphite/epoxy laminates with symmetric layups of [∓45] s , [−45 2 /45 2 ] s , and [0/±45/90] s...

... This paper is concerned with developing empirical crippling curves for A-S/3501 graphite/epoxy laminated plates to use in analyzing the buckling behavior of stiffened plates. The cross sections of the stiffeners are restricted to flat plate elements, where either both unloaded edges are simply...

... The elastic torsional buckling strength has been determined experimentally for thin-walled cylinders fabricated with glass/epoxy, boron/epoxy, and graphite/epoxy composite materials and composite-reinforced aluminum and titanium. Cylinders have been tested with several unidirectional-ply...