Improved method for non-linear FE analysis of polar class ship primary structures

2020 ◽  
Vol 74 ◽  
pp. 102825
Author(s):  
Ville Valtonen ◽  
James Bond ◽  
Rob Hindley
Keyword(s):  
Fe Analysis ◽  
Improved Method ◽  
Non Linear ◽  
Primary Structures

A Study on the Simplified Calculation Method for the Residual Ultimate Strength of Damaged Hull Structures

2016 ◽  
Author(s):  
Kimihiro Toh ◽  
Shunsuke Maeda ◽  
Takao Yoshikawa
Keyword(s):  
Ultimate Strength ◽  
Calculation Method ◽  
Fe Analysis ◽  
Structural Members ◽  
Average Strain ◽  
Non Linear ◽  
Compressive Loads ◽  
Calculation Results ◽  
Simplified Calculation ◽  
Simplified Calculation Method

In order to obtain the non-linear average stress-average strain relationships (σ-ε curves) of damaged structural members under both tensile and compressive loads, the systematical calculations are performed using the non-linear FE analysis (FEA) code, LS-DYNA, and the idealized σ-ε curves of damaged structural members are estimated from FEA results. In addition, by introducing the idealized σ-ε curves of damaged structural members to the simplified calculation program, which is developed by authors and based on the Smith’s method, the residual ultimate strength of damaged hull structures is calculated. The residual ultimate strength of damaged hull structures is also calculated utilizing FEA, the calculation results by the simplified calculation program are compared with the results obtained from FE analyses so as to examine the accuracy of simplified calculation method.

scholarly journals Vibro-impact attachments as shock absorbers

2008 ◽  
Vol 222 (10) ◽  
pp. 1899-1908 ◽  
Author(s):  
I Karayannis ◽  
A F Vakakis ◽  
F Georgiades
Keyword(s):  
Energy Dissipation ◽  
Vibration Absorber ◽  
Linear Vibration ◽  
Shock Energy ◽  
Shock Absorbers ◽  
Non Linear ◽  
Parametric Studies ◽  
Primary Structures ◽  
Shock Protection

The use of vibro-impact (VI) attachments as shock absorbers is studied. By considering different configurations of primary linear oscillators with VI attachments, the capacity of these attachments to passively absorb and dissipate significant portions of shock energy applied to the primary systems is investigated. Parametric studies are performed to determine the dependence of energy dissipation by the VI attachment in terms of its parameters. Moreover, non-linear shock spectra are used to demonstrate that appropriately designed VI attachments can significantly reduce the maximum levels of vibration of primary systems over wide frequency ranges. This is in contrast to the classical linear vibration absorber, whose action is narrowband. In addition, it is shown that VI attachments can significantly reduce or even completely eliminate resonances appearing in the linear shock spectra, thus providing strong, robust, and broadband shock protection to the primary structures to which they are attached.

70 Teriparatide Reduces the Size of Regions at High Risk of Failure as Assessed by Non-Linear FE Analysis In Vivo

2009 ◽  
Vol 12 (1) ◽  
pp. 120-121
Author(s):  
C. Graeff ◽  
Y. Chevalier ◽  
M. Charlebois ◽  
P. Varga ◽  
D. Pahr ◽  
...  
Keyword(s):  
High Risk ◽  
Fe Analysis ◽  
Risk Of Failure ◽  
Non Linear

Dropped Object Analysis Using Non-Linear Dynamic FE Analysis

2014 ◽  
Author(s):  
Kwanghyun Ahn ◽  
Minsung Chun ◽  
Sangmin Han ◽  
Kibok Jang ◽  
Yongsuk Suh
Keyword(s):  
Material Properties ◽  
Failure Criteria ◽  
Offshore Structures ◽  
Linear Analysis ◽  
Fe Analysis ◽  
Structural Safety ◽  
Design Consideration ◽  
Linear Dynamic ◽  
Non Linear

For the last few decades, necessity of direct non-linear FE analysis has been increasing for the accidental events at the vessel/offshore structures. One of major areas for the accidental design, dropped object analysis using non-linear analysis is indispensable for the verification of structural safety at the design process. This paper is concerned with the methodology, conditions, and design consideration of dropped object analysis using dynamic FE analysis. By comparing the results from direct FE analyses to those from simplified energy method described in DNV-RP-C204, necessities and advantages of direct non-linear analysis can be verified. In this paper, the effect of analysis condition is investigated using parametric study. The results are influenced by the application of failure criteria according to the rule requirements, application of material properties, dropping position, condition of the object, and so on. This study can suggest appropriate determination of the methodology and condition for the dropped object analysis using direct FE analysis.

scholarly journals FE Modelling of Experimental Brickwork Masonry Building Under Eccentric Shear Force

2017 ◽  
Vol 11 (1) ◽  
pp. 1036-1058 ◽  
Author(s):  
Roberto Capozucca ◽  
Erica Magagnini ◽  
Giuseppe Pace
Keyword(s):  
Fe Analysis ◽  
Masonry Building ◽  
Masonry Structures ◽  
Fe Modelling ◽  
Linear Elastic ◽  
Building Model ◽  
Non Linear ◽  
University Of Edinburgh ◽  
The University ◽  
Theoretical Results

Introduction: This paper compares theoretical results with the experimental investigation developed in the laboratory at the University of Edinburgh on a five-storey masonry building model in scale 1:3. In the case of masonry structures, unfortunately, the control of the theoretical results obtained by FE analysis is often hard although it is fundamental to verify the actual procedure of calculus both in the rehabilitation and in the project of new masonry structures. Methods: The aim of this work is to describe the response under lateral loading of a masonry building model prototype analysis by means of FE linear elastic modelling, assessing its performance through the comparison between the theoretical results and the experimental data. A non-linear static FE analysis has been also performed to investigate the actual ductile capacity of the structural system in relation to the different eccentricities of loadings. Results and Conclusion: Finally, the results of linear elastic analysis and non linear have been shown and discussed. The capacity of the ground floor’s walls of the building in shear, bending and torsional moments has been evaluated and discussed.

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