ANALYSIS OF A WWII T2-TANKER USING A VIRTUAL 3D MODEL AND CONTEMPORARY CRITERIA

2021 ◽  
Vol 159 (A4) ◽  
Author(s):  
C Bonnici ◽  
C De Marco Muscat-Fenech ◽  
R Ghirlando
Keyword(s):  
Residual Strength ◽  
3D Model ◽  
Strength Analysis ◽  
Historical Literature ◽  
Welded Structure ◽  
Water Pumps

The S.S. Ohio that saved the Maltese from capitulation during WWII made it to Malta barely afloat on the 15th of August 1942. Historical literature provides three main hypotheses as to why the tanker did not sink under heavy attack, namely: the use of water pumps partially restored buoyancy, the cargo density and a strong fully welded hull. A stability, floodable length and residual strength analysis was conducted to confirm or disprove the hypotheses. The results indicated that the vessel was stable, the water pumps partially restored buoyancy and was sinking despite her welded structure and cargo on-board. A challenge was to draw a comparison between the results and applicable criteria. At the time, criteria only governed the ship’s scantlings and did not focus on stability, floodable length and residual strength. The research provided engineering evidence on how the S.S. Ohio survived, whilst contemporary criteria were identified to assess the tanker’s characteristics.

Analysis of a WWII T-2 Tanker Using a Virtual 3D Model and Contemporary Criteria

2017 ◽  
Vol 159 (A4) ◽  
Author(s):  
C Bonnici ◽  
C De Marco Muscat-Fenech ◽  
R Ghirlando
Keyword(s):  
Residual Strength ◽  
3D Model ◽  
Strength Analysis ◽  
Historical Literature ◽  
Welded Structure ◽  
Water Pumps

The S.S. Ohio that saved the Maltese from capitulation during WWII made it to Malta barely afloat on the 15th of August 1942. Historical literature provides three main hypotheses as to why the tanker did not sink under heavy attack, namely: the use of water pumps partially restored buoyancy, the cargo density and a strong fully welded hull. A stability, floodable length and residual strength analysis was conducted to confirm or disprove the hypotheses. The results indicated that the vessel was stable, the water pumps partially restored buoyancy and was sinking despite her welded structure and cargo on-board. A challenge was to draw a comparison between the results and applicable criteria. At the time, criteria only governed the ship’s scantlings and did not focus on stability, floodable length and residual strength. The research provided engineering evidence on how the S.S. Ohio survived, whilst contemporary criteria were identified to assess the tanker’s characteristics.

The Parametric Modeling and Contact Strength Analysis for the Wind Power Increasing Gear

2012 ◽  
Vol 522 ◽  
pp. 447-452
Author(s):  
Jing Luo ◽  
Mutellip Ahmat ◽  
Qiang Gao ◽  
Li Chao Ren
Keyword(s):  
Wind Power ◽  
Theoretical Basis ◽  
Optimization Design ◽  
3D Model ◽  
Parametric Modeling ◽  
Strength Analysis ◽  
Contact Strength ◽  
Set Up ◽  
Gear Contact ◽  
Designing Method

In this paper, the precise 3D model of the wind power increasing gear was set up by based on the parametric designing method of Pro/Program, then the contact strength of the gear was analyzed by the FEM and the Hertz theoretical value was calculated, the FEM and the Hertz results were contrasted in order to confirm the applicability of the numerical analysis in wind power gear contact analysis. Finally, the corresponding analysis conclusion was received.The researching results offered a effective theoretical basis for the optimization design and analysis of the wind increasing gear.

scholarly journals Residual Strength Analysis Method for Composite Laminates with Internal Defects Using a Quasi-Three-Dimensional Model.

1993 ◽  
Vol 59 (563) ◽  
pp. 1697-1701 ◽  
Author(s):  
Tsuyoshi Nishiwaki ◽  
Atsushi Yokoyama ◽  
Zen'ichiro Maekwa ◽  
Hiroyuki Hamada ◽  
Yoshinori Maekawa ◽  
...  
Keyword(s):  
Residual Strength ◽  
Composite Laminates ◽  
Three Dimensional ◽  
Strength Analysis ◽  
Analysis Method ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Internal Defects

Residual Strength Analysis of a Damaged WWII T2 Tanker

2018 ◽  
Vol 62 (1) ◽  
pp. 48-74
Author(s):  
Colin Bonnici ◽  
Claire De Marco Muscat-Fenech ◽  
Robert Ghirlando
Keyword(s):  
Residual Strength ◽  
Strength Analysis

Finite Element Analysis of Portable Exoskeleton Based on Ergonomics Parameters Model

2012 ◽  
Vol 215-216 ◽  
pp. 168-173
Author(s):  
Fang Liu ◽  
Wen Ming Cheng ◽  
Lan He
Keyword(s):  
Finite Element ◽  
Body Size ◽  
3D Model ◽  
Weight Bearing ◽  
Strength Analysis ◽  
Material Strength ◽  
Adult Body Size ◽  
Mechanical Structure ◽  
Chinese Adult ◽  
Adult Body

Improvement of Weight capacity and weight-bearing exercise endurance in human are the main purpose of Portable Exoskeleton. The object of study is the Exoskeletons mechanical structure and through it to improve the structure bearing capacity. Firstly, this study takes the data of Chinese adult body size as the related parameters in ergonomics of Exoskeleton. Also the ergonomics parameters of pivotal bearing parts such as hip, thighs and legs will be confirmed according to the 50 percentage data of the data of Chinese adult body size. Based on it, 3D model of Portable Exoskeleton have been established by using Solidworks software and fast assembly of Exoskeleton’s parts have been accomplished. At the same time 3D Model have been conversed the x_t format and to be guided into the ANSYS software. A finite element based strength analysis of the mechanical structure of the external skeletal is then achieved with the load being 800N and the operating condition being one-leg standing. The numerical results show that key parts of the external skeletal meet the requirements. The maximum stress value is 127Mpa by ignoring the stress concentration phenomenon, confirming the reasonability of the structure design. Nevertheless, stress value on exoskeleton joints exceeds the material strength, some suggestions are then proposed on joint design.

Strength Analysis of Solar Sweeper Frame by Using Different Connection

2012 ◽  
Vol 538-541 ◽  
pp. 762-767
Author(s):  
Yu Xian ◽  
Yang Guang
Keyword(s):  
Working Conditions ◽  
Maximum Stress ◽  
Steel Plate ◽  
Strength Analysis ◽  
The Finite Element Method ◽  
Static State ◽  
Full Load ◽  
Welded Structure ◽  
Thin Steel ◽  
Thin Steel Plate

Frame of solar sweeper is complexly welded structure with thin steel plate. The finite element method is applied of the frame strength analysis in two working conditions, full-load static and braking state. HyperMesh software is used for analysis of integral and welded frame model. CWELD is created to simulate the welding connection. The numerical results show that maximum stress of integral frame is 60.24MPa, and maximum stress of welded frame is 70.7MPa under full-load static state. The maximum stress different is 14.8% of two working conditions. The frame of solar sweeper satisfy strength requirement under the two working conditions, when the welding connection is considered. And the frame can be optimized by using these results.

Sign in / Sign up

Export Citation Format

Share Document