SAFEHULL FINITE ELEMENT ANALYSIS OF HULL

SAFEHULL FINITE ELEMENT ANALYSIS OF HULL STRUCTURES
CONTENTS
SECTION 1 Introduction ............................................................................1
FIGURE 1
SECTION 2
Global 3D FEA Model.............................................................5
1 3 5 7 9 General ..................................................................................5 Extent of the Global 3D FEA Model.......................................5 Coordinate and Unit System of the Global Model .................9 Element Types and Combination.........................................10 Finite Element Modeling ......................................................11
15.1 15.3 15.5 15.7 15.9 Supporting Rod and Its Property .....................................23 Tankers ...........................................................................24 Bulk Carriers....................................................................26 Containership Models......................................................27 Boundary Constraint Beams on the Two End Sections ...28
TABLE 1
FIGURE 1 FIGURE 2 FIGURE 3 FIGURE 4 FIGURE 5
ABS GUIDANCE NOTES ON SAFEHULL FINITE ELEMENT ANALYSIS OF HULL STRUCURE 6 FIGURE 7 FIGURE 8 FIGURE 9 FIGURE 10
Typical Mesh Arrangement of VLCC Oil Tankers......14 Typical Mesh Arrangement of Cape Size Bulk Carriers ......................................................................15 Typical Mesh Arrangement of Container Carriers .....16 SafeHull Nastran Model Check Tool..........................18 SafeHull Groups and Displays the Model by Grouping Parts ...........................................................18
Copyright 2004 American Bureau of Shipping ABS Plaza 16855 Northchase Drive Houston, TX 77060 USA
This Page Intentionally Left Blank
GUIDANCE NOTES ON
GUIDANCE NOTES ON
SAFEHULL FINITE ELEMENT ANALYSIS OF HULL STRUCTURES
DECEMBER 2004
American Bureau of Shipping Incorporated by Act of Legislature of the State of New York 1862
11 13
FEA Model Verification ........................................................17 SafeHull Verification Tools...................................................18 Recommended Baseline Mesh Size and Mesh Order for Global Model ..............................................12 Extent of the 3D Global Model and Mesh Arrangement for Tankers .............................................6 Extent of the 3D Global Model and Mesh Arrangement for Bulk Carriers .....................................7 Extent of the 3D Global Model and Mesh Arrangement for Container Carriers ............................8 Model Coordinate System............................................9 Typical Mesh Arrangement of Aframax Oil Tankers ......................................................................13
TABLE 1 TABLE 2 TABLE 3
Steel Vessel Rules Specified Loading Criteria (150 m or More in Length) .........................................19 Steel Vessel Rules Specified Loading Patterns.........20 Steel Vessel Rules Specified Loading Combination Factors .......................................................................20 SafeHull “View Tank Boundaries” and “Search Log File” Tools ..................................................................21 SafeHull “View Tank and Frame Load” Tool..............22 View Curves of Hull Girder Load in the SafeHull System .......................................................................23 Spring Supports for Tanker Global Models................25 Spring Supports at Fore End of Bulk Carrier Global Models........................................................................26 Spring Supports at Aft End for Container Carrier Global Models ............................................................28 Spring Supports at Fore End for Container Carrier Global Models ............................................................28
9.1 9.3 Model for Responses ...................................................... 11 Element Size ................................................................... 11
1 3 5 7 9 Objectives ..............................................................................1 Scope of Application ..............................................................1 Overview of Analysis Procedure............................................1 Required Analyses.................................................................2 Supplementary Analyses .......................................................3 Overview of the FEA Model Functions and Analyses for SafeHull TSA ..........................................................2
SECTION 3
Loading and Boundary Conditions .................................... 19
1 3 5 7 9 11 13 15 General ................................................................................19 Loading and Loading Patterns.............................................19 Load Combination Factor and Load Cases .........................20 Identify Compartments.........................................................20 Apply Load Components to Compartment Boundaries .......21 Pressure Superposition and Force Conversion ...................21 Hull Girder Loads and Load Equilibrium ..............................22 Boundary Conditions............................................................23