Effect of Delamination on the Nonlinear Behavior of Composite Laminated Beams

1990 ◽  
Vol 112 (4) ◽  
pp. 393-397 ◽  
Author(s):  
I. Sheinman ◽  
M. Soffer
Keyword(s):  
Nonlinear Analysis ◽  
Laminated Composite ◽  
Nonlinear Behavior ◽  
Initial Imperfection ◽  
Load Carrying Capacity ◽  
Buckling Behavior ◽  
Load Carrying ◽  
Geometrical Nonlinear ◽  
Laminated Composite Beams ◽  
Kinematic Approach

This paper presents a parametric study of the effect of delamination, and of initial imperfection, on the overall nonlinear behavior of laminated composite beams. The study is based on geometrical nonlinear analysis with the Von-Karman kinematic approach. It is shown that the bifurcation point provides not more than an indication of the buckling behavior, and that the full nonlinear analysis is needed for predicting the load-carrying capacity. It was also found that the delaminated beam is sensitive to initial imperfection.

scholarly journals Free Vibration and Buckling Analysis of the Laminated Composite Beams by Using GDQM

2009 ◽  
Vol 18 (2) ◽  
pp. 096369350901800
Author(s):  
Gökmen Atlıhan ◽  
Ersin Demir ◽  
Zekeriya Girgin ◽  
Hasan Çallıoğlu
Keyword(s):  
Free Vibration ◽  
Natural Frequencies ◽  
Differential Quadrature Method ◽  
Laminated Composite ◽  
Mode Shapes ◽  
Load Carrying Capacity ◽  
Load Carrying ◽  
Generalized Differential ◽  
Laminated Composite Beam ◽  
Laminated Composite Beams

In this study, effects of stacking sequences of composite laminated beams on natural frequencies and buckling behaviour have been analyzed by Generalized Differential Quadrature Method (GDQM) and Finite Element Method (FEM). Mode shapes were also investigated for one mode of buckling and three modes of free vibration analyses. In addition, variations of mode shapes for different boundary conditions were presented in details. Numerical results show that the effective stiffness of the laminated composite beam can be altered through an adjustment in the stacking sequence. Thus, such an adjustment in stacking sequences allows operations in desired natural frequencies and load carrying capacity without changing its geometry drastically or without changing its weight.

Post-buckling Behavior of Stiffened Cross-Ply Cylindrical Shells

1994 ◽  
Vol 61 (4) ◽  
pp. 998-1000 ◽  
Author(s):  
M. Savoia ◽  
J. N. Reddy
Keyword(s):  
Axial Compression ◽  
Carrying Capacity ◽  
Shell Theory ◽  
Load Carrying Capacity ◽  
Imperfection Sensitivity ◽  
Buckling Modes ◽  
Geometric Imperfection ◽  
Buckling Behavior ◽  
Load Carrying ◽  
Post Buckling

The post-buckling of stiffened, cross-ply laminated, circular determine the effects of shell lamination scheme and stiffeners on the reduced load-carrying capacity. The effect of geometric imperfection is also included. The analysis is based on the layerwise shell theory of Reddy, and the “smeared stiffener” technique is used to account for the stiffener stiffness. Nu cylinders under uniform axial compression is investigated to merical results for stiffened and unstiffened cylinders are presented, showing that imperfection-sensitivity is strictly related to the number of nearly simultaneous buckling modes.

Geometric Imperfection Sensitivity and Effect of Constraint Conditions of H-Section Columns under Compression

2010 ◽  
Vol 102-104 ◽  
pp. 140-144
Author(s):  
Yi Ping Wang ◽  
Yong Zang ◽  
Di Ping Wu
Keyword(s):  
Carrying Capacity ◽  
Steel Structures ◽  
Load Carrying Capacity ◽  
Imperfection Sensitivity ◽  
Geometric Imperfection ◽  
Manufacture Process ◽  
Buckling Behavior ◽  
Load Carrying ◽  
Thin Walled ◽  
Tolerance Control

The buckling behavior of thin-walled steel structures under load is still imperfectly understood, in spite of much research over the past 50 years. In this paper, the buckling behaviors of H-section columns under compression have been simulated with ANSYS. In the analysis, contact pairs between column ends and end blocks have been introduced into the model, and the load carrying capacity of the columns with four kinds of end constraint conditions and various typical initial geometric imperfections has been calculated and discussed. The results indicate that the load carrying capacity is most sensitive to the flexural imperfection, and the constraint condition cannot change the imperfection sensitivity of a column under compression, but improving restrain condition can heighten the load carrying capacity. They are helpful to the use and the tolerance control in the manufacture process of thin-walled H-section steel structures.

scholarly journals Geometrically nonlinear analysis of thin-walled laminated composite beams

2015 ◽  
Vol 12 (11) ◽  
pp. 2094-2117 ◽  
Author(s):  
Luiz Antônio Taumaturgo Mororó ◽  
Antônio Macário Cartaxo de Melo ◽  
Evandro Parente Junior
Keyword(s):  
Nonlinear Analysis ◽  
Laminated Composite ◽  
Composite Beams ◽  
Geometrically Nonlinear ◽  
Geometrically Nonlinear Analysis ◽  
Thin Walled ◽  
Laminated Composite Beams

Comparative Research on Mechanical Behavior of Column-Bracing System between Fixed-Ended and Pin-Ended Column Base

2011 ◽  
Vol 250-253 ◽  
pp. 2519-2523
Author(s):  
Jin You Zhao ◽  
Yao Chun Zhang ◽  
Xun Guo
Keyword(s):  
Mechanical Behavior ◽  
Carrying Capacity ◽  
Ultimate Load ◽  
Initial Imperfection ◽  
Load Carrying Capacity ◽  
The Monte Carlo Method ◽  
Load Carrying ◽  
Ultimate Load Carrying Capacity ◽  
Bracing System ◽  
Column Base

In order to investigate the different mechanical behavior of column-bracing system between fixed-ended and pin-ended column base, a large number of column-bracing systems with fixed-ended and pin-ended column base were studied using the ANSYS program, in which random combination of the initial imperfections between columns and braces was well considered by the Monte Carlo method. Based on the above comparative study, probability density function of the bracing force was found through probability statistics and the design bracing force is obtained. The results show that the ultimate load-carrying capacity and the bracing forces of the mid-height horizontal braces of column-bracing systems with pin-ended column base are higher than that of column-bracing systems with fixed-ended column base, and the higher ultimate load-carrying capacity of the former more significantly increases the bracing forces of the mid-height horizontal braces; that the bracing forces of the mid-height horizontal braces in compression or in tension have also randomness because of the randomness of the initial imperfection of both columns and braces.

Steel and Steel-Concrete Composite Columns of HEA-Cross-Sections with Member Imperfections, Subjected to Buckling Compression

2013 ◽  
Vol 743 ◽  
pp. 164-169
Author(s):  
Marcela Karmazínová
Keyword(s):  
Cross Sections ◽  
Initial Imperfection ◽  
High Strength ◽  
Load Carrying Capacity ◽  
Test Results ◽  
Composite Columns ◽  
Geometrical Imperfection ◽  
Load Carrying ◽  
Buckling Resistance ◽  
Normal Strength

The paper deals with the problems of the load-carrying capacity of steel and steel-concrete composite members composed of high-strength materials, subjected to compression. The attention is mainly paid to the buckling resistance in the connection with member imperfections, which are usually covered by the equivalent initial geometrical imperfection expressed as the maximal initial member curving in the mid-length of the buckled member subjected to compression. The paper is oriented to the analytical solution of the initial eccentricity based on the conception of the buckling strength and to the possibilities how to verify the initial imperfection experimentally. The analysis of this problem is shown on the examples of steel and steel-concrete composite columns represented by open HEA cross-section and by the same cross-sections partially encased by normal-strength and high-strength concrete. Using test results of the specimens subjected to compression the comparison of actual values of initial imperfections with the corresponding theoretical values is presented here.

scholarly journals Inelastic Ultimate Load Analysis of Steel Frames Considering Lateral Torsional Buckling Under Distributed Loads

2019 ◽  
Author(s):  
Mutlu Secer ◽  
Ertugrul Turker Uzun
Keyword(s):  
Carrying Capacity ◽  
Ultimate Load ◽  
Steel Frames ◽  
Load Carrying Capacity ◽  
Lateral Torsional Buckling ◽  
Torsional Buckling ◽  
Numerical Examples ◽  
Buckling Behavior ◽  
Load Carrying ◽  
Load Analysis

Contemporary structural design approaches necessitates ways to determine realistic behavior of structures. For this purpose, inelastic ultimate load analysis methods are used widely since strength and stability of whole structure can be represented. In this study, a numerical method is proposed for determining inelastic ultimate load capacity of steel frames considering lateral torsional buckling behavior under distributed loads. In the analyses, inelastic material behavior, second-order effects and residual stresses of the structural frame system and its members are taken into account. Additionally, lateral torsional buckling behavior is considered in the analysis using finite difference method and it is used for determining the structural load carrying capacity of steel frames. Consequently, the problem associated with flexural capacity decreases due to lateral torsional buckling is precisely considered in the load increment steps of inelastic ultimate load analysis. In order to validate the proposed method, numerical examples from the literature are calculated considering the proposed method, AISC 360-16 design specification equations and approaches from the literature. Results of the numerical examples show that lateral torsional buckling is a key issue in determining structural load carrying capacity. Thus, proposed analysis method is shown to be an efficient and consistent tool for inelastic ultimate load analysis.

Nonlinear Bending and Collapse Analyses of a Poked Cylinder and Other Point-Loaded Cylinders

1983 ◽  
Vol 105 (4) ◽  
pp. 347-355 ◽  
Author(s):  
L. H. Sobel
Keyword(s):  
Carrying Capacity ◽  
Elastic Shell ◽  
Nonlinear Behavior ◽  
Displacement Curve ◽  
Geometrically Nonlinear ◽  
Load Carrying Capacity ◽  
Primary Interest ◽  
Nonlinear Bending ◽  
Load Carrying ◽  
Displacement Effects

Numerical results based on the STAGSC-1 finite element computer program are presented for the geometrically nonlinear behavior of cylindrical shells subjected to inward-directed radial point loads. Three elastic shell problems are considered: the poked cylinder (single load at midlength), which is the problem of primary interest, and the venetian blind and pinched cylinder, which are check cases. Load versus displacement curves obtained for the three problems reveal that geometric nonlinear (large displacement) effects are important. For the poked cylinder it is concluded that the maximum at the limit point of the load-displacement curve corresponds to a small local snapping of the cylinder that does not result in a loss of load-carrying capacity. The paper also discusses certain features of STAGSC-1 that should be helpful to users of the program.

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