scholarly journals Sensitivity analysis for frequency-based prediction of cracks in open cross-section beams

2019 ◽  
Vol 27 ◽  
pp. 7-12 ◽  
Author(s):  
Gilbert-Rainer Gillich ◽  
Constantin-Ioan Barbinta ◽  
Cristian Tufisi ◽  
Codruta Oana Hamat ◽  
Dorian Nedelcu
Keyword(s):  
Sensitivity Analysis ◽  
Cross Section ◽  
Open Cross Section

scholarly journals ADJOINT APPROACH SENSITIVITY ANALYSIS OF THIN‐WALLED BEAMS AND FRAMES

2005 ◽  
Vol 11 (1) ◽  
pp. 57-64 ◽  
Author(s):  
Ireneusz Kreja ◽  
Tomasz Mikulski ◽  
Czeslaw Szymczak
Keyword(s):  
Sensitivity Analysis ◽  
Cross Section ◽  
Fem Model ◽  
Static Loads ◽  
Shell Elements ◽  
Beam Elements ◽  
Thin Walled ◽  
The One ◽  
Adjoint Approach ◽  
Open Cross Section

Sensitivity analysis of beams and frames assembled of thin‐walled members is presented within the adjoint approach. Static loads and structures composed of thin‐walled members with the bisymmetrical open cross‐section are considered. The analysed structure is represented by the one‐dimensional model consisting of thin‐walled beam elements based on the classical assumptions of the theory of thin‐walled beams of non‐deformable cross‐section together with superelements applied in place of location of structure nodes, restraints and stiffeners. The results of sensitivity analysis, obtained for the structure model described above, are compared with the results of the detailed FEM model, where the whole structure is discretised with the use of QUAD4 shell elements of the system MSC/NASTRAN.

scholarly journals Sensitivity Analysis of Buckling Loads of Bisymmetric I-Section Columns with Bracing Elements / Analiza Wrazliwosci Siły Krytycznej Słupa Cienkosciennego Ze Stezeniami

2010 ◽  
Vol 56 (1) ◽  
pp. 69-88 ◽  
Author(s):  
P. Iwicki
Keyword(s):  
Sensitivity Analysis ◽  
Critical Load ◽  
Cross Section ◽  
Exact Relation ◽  
Buckling Loads ◽  
Numerical Examples ◽  
First Order ◽  
Order Variation ◽  
Thin Walled ◽  
Open Cross Section

Abstract The first order variation of critical loads of thin-walled columns with bisymmetric open cross-section due to some variations of the stiffness and location of bracing elements is derived. The considerations are based on the classical linear theory of thin-walled beams with non-deformable cross-section introduced by Vlasov [1]. Both lateral braces and braces that restraint warping and torsion of the cross-section have been taken into account. In the numerical examples dealing with I-column, the functions describing the influence of location of the braces with unit stiffness on the critical load of torsional and flexural buckling are derived. The linear approximation of the exact relation of the critical load due to the variation of the stiffness and location of braces is determined.

Free Vibration of Thin-Walled Open Section Beams With Unconstrained Damping Treatment

1981 ◽  
Vol 48 (1) ◽  
pp. 169-173 ◽  
Author(s):  
S. Narayanan ◽  
J. P. Verma ◽  
A. K. Mallik
Keyword(s):  
Free Vibration ◽  
Cross Section ◽  
Transverse Vibration ◽  
Natural Frequencies ◽  
Vibration Characteristics ◽  
Numerical Results ◽  
Simply Supported ◽  
Clamped Beams ◽  
Thin Walled ◽  
Open Cross Section

Free-vibration characteristics of a thin-walled, open cross-section beam, with unconstrained damping layers at the flanges, are investigated. Both uncoupled transverse vibration and the coupled bending-torsion oscillations, of a beam of a top-hat section, are considered. Numerical results are presented for natural frequencies and modal loss factors of simply supported and clamped-clamped beams.

scholarly journals Investigation of the Warping Torsion of a Press Machine

2020 ◽  
Vol 15 (3) ◽  
pp. 150-161
Author(s):  
Antal Gábor Erdős ◽  
Károly Jármai
Keyword(s):  
Normal Stress ◽  
Cross Section ◽  
Torsional Stress ◽  
Very High ◽  
Open Cross Section

In this article, the investigation of a press machine with 30 tons of pressing weight is presented. The beam of this machine is an I-beam, which has an open cross-section. It is known that this version of cross-section is sensitive to torsional stress. The stress from warping torsion is normal stress, so the opened cross-section is more sensitive to this type of stress. The bimoment that causes normal stress can also be very high, so dealing with this stress is very important.

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