Ultimate Compressive Strength Assessment of Damaged Plates

2017 ◽  
Author(s):  
Diogo do Amaral M. Amante ◽  
Ilson P. Pasqualino ◽  
Segen F. Estefen
Keyword(s):  
Compressive Strength ◽  
Residual Stresses ◽  
Ultimate Strength ◽  
Ultimate Compressive Strength ◽  
Steel Plates ◽  
Geometric Imperfections ◽  
Strength Assessment ◽  
Local Dent ◽  
Analytical Expressions ◽  
Dent Depth

This paper presents the assessment of the ultimate compressive strength of damaged steel plates with a local dent. The explicit nonlinear finite element code from ABAQUS program was employed to simulate dynamically the dent damage. Therefore, the residual stresses due to the damage were considered in subsequent numerical compression analyses. A parametric study of plates considering residual stresses, geometric imperfections and dents was accomplished. Results showed that local dent is the dominant parameter for the ultimate strength of damaged plates. For a particular dent depth, the effect of welding induced geometric imperfections and residual stresses can be disregarded from the analysis. Afterwards, analytical expressions were developed to estimate the ultimate strength of damaged plates.

Collapse Strength of Damaged Plating

2008 ◽  
Author(s):  
Plamen I. Nikolov
Keyword(s):  
Compressive Strength ◽  
Residual Stresses ◽  
Ultimate Strength ◽  
Fe Simulation ◽  
Compressive Loading ◽  
Simultaneous Presence ◽  
Bulk Carrier ◽  
Residual Deflection ◽  
Collapse Strength ◽  
The Common

In this paper, based on Finite Element (FE) simulation, the ultimate strength of damaged continuous plating is studied considering the combined effect of residual deflections and stresses. Firstly, damage over plating is simulated resulting to residual deflection in prescribed shape and magnitude accompanied by residual stresses. Then compressive loading is applied and the effect of simultaneous presence of both residual deflections and residual stresses on the plating ultimate strength is studied. It is found that (1) the compressive strength may be significantly overestimated when the damage related residual stresses are not considered, (2) a larger magnitude of initial dishing does not necessary result to a lower ultimate strength. It is shown that the simplified methods in the Common Bulk Carrier Rules need further improvements.

Corrosion-Dependent Ultimate Strength Assessment of Aged Box Girders Based on Experimental Results

2011 ◽  
Vol 55 (04) ◽  
pp. 289-300 ◽  
Author(s):  
S. Saad-Eldeen ◽  
Y. Garbatov ◽  
C. Guedes Soares
Keyword(s):  
Service Life ◽  
Residual Stresses ◽  
Ultimate Strength ◽  
Bending Moment ◽  
Experimental Results ◽  
Time Dependent ◽  
Strength Analysis ◽  
Box Girders ◽  
Strength Assessment ◽  
Equivalent Time

This paper presents a corrosion-dependent analysis of the ultimate strength analysis of aged box girders based on experimental results. Three multispan corroded stiffened box girders subjected to four-point vertical load are analyzed, idealizing the behavior of midship sections of full ships. The specimens have three levels of corrosion. Two corrosion-dependent formulas for assessing the ultimate strength as well as the ultimate bending moment of corroded structures are proposed. Using a time-dependent corrosion growth model, equivalent time-dependent formulations are developed. The effect of corrosion degradation on the residual stresses during the service life is also analyzed, and a regression equation for predicting the remaining residual stresses along the service life is proposed. Finally, a corrosion-dependent moment-curvature relationship has been developed accounting for the changes in geometrical characteristics and material properties of the tested box girders.

The Clinker Minerals Effect on the Cement Hardening Kinetic Constants

2019 ◽  
Vol 974 ◽  
pp. 217-223
Author(s):  
Shark M. Rakhimbaev ◽  
Tatiana V. Anikanova ◽  
Igor S. Rakhimbaev ◽  
Alexey S. Pogromsky
Keyword(s):  
Compressive Strength ◽  
Ultimate Strength ◽  
Sharp Decrease ◽  
Ultimate Compressive Strength ◽  
Kinetic Constants ◽  
The Individual ◽  
The Relationship ◽  
Positive Effect

The work is devoted to the study of the relationship between the individual clinker minerals content, the stone compressive strength in different periods of hardening and the binders kinetic hardening constants. It is shown that C3S and C2S affect the cements’ kinetic hardening constants in the early and long-term periods in different ways. There is a positive effect of C2S on the ultimate compressive strength and a sharp decrease in the dependence of the stone ultimate strength on C3S in the later periods. The initial hardening rate in high-cement cement is established to increase sharply with an increase in the C3A content from 5 to 12%. The increase in the C3A content up to 12% in low-cement cement has little effect on the initial hardening rate value.

Effects of Welding Residual Stresses on High Tensile Steel Plate Ultimate Strength: Nonlinear Finite Element Method Investigations

2011 ◽  
Vol 134 (2) ◽  
Author(s):  
Jeom Kee Paik ◽  
Jung Min Sohn
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Residual Stresses ◽  
Ultimate Strength ◽  
Plate Thickness ◽  
Primary Objective ◽  
Nonlinear Finite Element ◽  
Steel Plates ◽  
Nonlinear Finite Element Method ◽  
Element Method

The primary objective of the present paper is to examine the effects of welding residual stresses on ultimate strength of high tensile steel plates under axial compression in terms of their magnitude and pattern. The ANSYS nonlinear finite element method is employed for the purpose. The secondary objective of the present paper is to study a nonlinear finite element method modeling technique for welded plate structures with residual stresses. Three levels of residual stresses, namely slight, average, and severe, are considered. As another important parameter of influence on the plate ultimate strength, the plate thickness is also varied in the numerical computations to examine their role and trend. Important insights and conclusions developed from the present study are documented.

Compressive Strength of Stiffened Plates With Imperfections: Simple Design Equations

2008 ◽  
Vol 52 (03) ◽  
pp. 227-237
Author(s):  
Koji Masaoka ◽  
Alaa Mansour
Keyword(s):  
Finite Element ◽  
Compressive Strength ◽  
Ultimate Strength ◽  
Parametric Study ◽  
Ultimate Compressive Strength ◽  
Initial Deflection ◽  
Stiffened Plates ◽  
Simple Design ◽  
Column Buckling ◽  
The Impact

The behavior and ultimate compressive strength of stiffened plates with imperfections have been investigated in this paper using a nonlinear finite element method. The imperfections considered consisted of initial deflection and residual stresses. Several types of initial deflections were investigated, including those that may initiate stiffener column buckling and stiffener tripping. Extensive parametric study was conducted in order to systematically determine the impact of these initial imperfections on the ultimate compressive strength of stiffened plates of various geometric properties and stiffener shapes. The objective of the study was to develop simple design equations for determining ultimate strength based on finite element parametric study. The developed algebraic equations reflect the impact of imperfections on ultimate strength. A Perry-Robertson type equation was developed to incorporate the influence of the imperfections. It was found that under certain conditions a hybrid type mode of failure was necessary to accurately represent the behavior of stiffened plates with imperfections, in addition to the usual plate and stiffener failure modes. It was also found that column buckling type initial deflection is the most important form of imperfection.

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