scholarly journals POST-BUCKLING HYSTERESIS AND CUMULATIVE DEFORMATION CAPACITY OF BUILT-UP MEMBER BRACES WITH LOCAL BUCKLING

2012 ◽  
Vol 77 (681) ◽  
pp. 1781-1790 ◽  
Author(s):  
Toru TAKEUCHI ◽  
Yuki KONDO ◽  
Ryota MATSUI ◽  
Akira IMAMURA
Keyword(s):  
Local Buckling ◽  
Deformation Capacity ◽  
Post Buckling ◽  
Cumulative Deformation

scholarly journals CUMULATIVE DEFORMATION CAPACITY AND DAMAGE EVALUATION FOR ELASTO-PLASTIC DAMPERS AT BEAM ENDS

2006 ◽  
Vol 71 (600) ◽  
pp. 115-122 ◽  
Author(s):  
Toru TAKEUCHI ◽  
Hiro SHIRABE ◽  
Satoshi YAMADA ◽  
Shoichi KISHIKI ◽  
Kazuaki SUZUKI ◽  
...  
Keyword(s):  
Deformation Capacity ◽  
Damage Evaluation ◽  
Cumulative Deformation

Design Sensitivity of Buckled Thin-Walled Composite Structural Elements

1997 ◽  
Vol 50 (11S) ◽  
pp. S3-S10 ◽  
Author(s):  
Leonel I. Alma´nzar ◽  
Luis A. Godoy
Keyword(s):  
Volume Fraction ◽  
Local Buckling ◽  
Design Sensitivity ◽  
Transverse Load ◽  
Design Parameters ◽  
Structural Elements ◽  
Perturbation Expansions ◽  
Cross Sectional ◽  
Buckling Loads ◽  
Post Buckling

This paper presents a theory and applications to account for changes in the fundamental, buckling, and post-buckling states when design parameters of a composite material are modified. The influence of micro-mechanical parameters (the volume fraction and the fiber orientation) and of cross-sectional dimensions is investigated. A numerical example for columns made of composite materials is presented. Sensitivity is studied for local buckling loads. Explicit expressions are obtained for the sensitivities in the form of perturbation expansions. A beam under transverse load is also investigated, and geometric design parameters employed to investigate sensitivity. The information from the sensitivity analysis can be used to improve a design by modification of the buckling load.

Enhancing Broadband Vibration Energy Suppression Using Local Buckling Modes in Constrained Metamaterials

2017 ◽  
Vol 139 (6) ◽  
Author(s):  
Ryan L. Harne ◽  
Daniel C. Urbanek
Keyword(s):  
Vibration Suppression ◽  
Local Buckling ◽  
Engineering Systems ◽  
Buckling Modes ◽  
Dynamic Mass ◽  
Stiffness Reduction ◽  
Elastomeric Dampers ◽  
Practical Engineering ◽  
Post Buckling ◽  
Relative Change

Studies on dissipative metamaterials have uncovered means to suppress vibration and wave energy via resonant and bandgap phenomena through such engineered media, while global post-buckling of the infinitely periodic architectures is shown to tailor the attenuation properties and potentially magnify the effective damping effects. Yet, despite the promise suggested, the practical aspects of deploying metamaterials necessitates a focus on finite, periodic architectures, and the potential to therefore only trigger local buckling features when subjected to constraints. In addition, it is likely that metamaterials may be employed as devices within existing engineering systems, so as to motivate investigation on the usefulness of metamaterials when embedded within excited distributed or multidimensional structures. To illuminate these issues, this research undertakes complementary computational and experimental efforts. An elastomeric metamaterial, ideal for embedding into a practical engineering structure for vibration control, is introduced and studied for its relative change in broadband damping ability as constraint characteristics are modified. It is found that triggering a greater number of local buckling phenomena provides a valuable balance between stiffness reduction, corresponding to effective damping magnification, and demand for dynamic mass that may otherwise be diminished in globally post-buckled metamaterials. The concept of weakly constrained metamaterials is also shown to be uniformly more effective at broadband vibration suppression of the structure than solid elastomeric dampers of the same dimensions.

Strength and Deformation Capacity of Corroded Pipes: The Joint Industry Project

2013 ◽  
Author(s):  
Erik Levold ◽  
Andrea Restelli ◽  
Lorenzo Marchionni ◽  
Caterina Molinari ◽  
Luigino Vitali
Keyword(s):  
Failure Modes ◽  
State Of The Art ◽  
Local Buckling ◽  
Bending Moment ◽  
External Pressure ◽  
Fe Model ◽  
Deformation Capacity ◽  
Offshore Pipelines ◽  
Strength And Deformation ◽  
Bending Loading

Considering the future development for offshore pipelines, moving towards difficult operating condition and deep/ultra-deep water applications, there is the need to understand the failure mechanisms and better quantify the strength and deformation capacity of corroded pipelines considering the relevant failure modes (collapse, local buckling under internal and external pressure, fracture / plastic collapse etc.). A Joint Industry Project sponsored by ENI E&P and Statoil has been launched with the objective to quantify and assess the strength and deformation capacity of corroded pipes in presence of internal overpressure and axial/bending loading. In this paper: • The State-of-the-Art on strength and deformation capacity of corroded pipes is presented; • The full-scale laboratory tests on corroded pipes under bending moment dominated load conditions, performed at C-FER facilities, are shown together with the calibrated ABAQUS FE Model; • The results of the ABAQUS FEM parametric study are presented.

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