18 Questions
What is the light displacement of the ship?
2400 tonnes
What is the load displacement of the ship when cargo is equally distributed in CH#2?
2520 tonnes
What is the linear density of the cargo in CH#2?
6 t/m
What is the length of CH#2?
20m
What is the volume of the ship?
2400 m3
What is the density of the water used in the calculation?
1.0 tonne/cu.m
What is the primary purpose of stress tables in ship design?
To analyze the ship's structural integrity and stability
What does a stress table provide information about?
The ship's structural members and their maximum allowable stresses or loads
What is the relationship represented in a stress table?
Between the applied stress and the corresponding deflection of the ship's hull
Who uses stress tables to ensure a ship's stability and structural integrity?
Naval architects and engineers
What is the unit of measurement for the allowable bending moment in a stress table?
kNm
What is the purpose of analyzing stress tables in ship design?
To ensure the ship's stability and prevent structural failures
What is the primary purpose of stress tables in ship design?
To ensure the vessel can handle expected loads and environmental conditions
What is the main challenge in calculating the necessary strength of ship structures?
The many and varied forces acting on the ship structure
Which of the following is a dynamical force acting on a ship structure?
Pitching due to wind and waves
What is the purpose of classification societies in ship design?
To provide guidelines for stress analysis and assessment
What is the bending of ships likened to in many cases?
The bending of a beam
Which of the following is a statical force acting on a ship structure?
The weight of the ship's structure
Study Notes
Shear Force and Bending Moment Diagram
- Load curve represents the distribution of weight along the ship's length
- Light displacement = (L x B x D) x density = 2400 tonnes
- Light displacement / length overall = 40 t/m (on lightweight)
- Cargo equally distributed in CH#2 (Trimmed): 120 tonnes / 20m = 6 t/m (on deadweight)
- Load displacement = light displacement + load weight (or deadweight) = 2520 tonnes
- Load displacement / length overall = 2520 t / 60 m = 42 t/m (on buoyancy)
Stress Tables and Ship Stability
- Stress tables represent the relationship between applied stress and corresponding deflection of the ship's hull
- Used to assess a ship's structural integrity and stability under various loading conditions
- Essential tool for naval architects and engineers to ensure ship's structure remains within safe limits during operation
- Typical stress table contains information about ship's structural members (frames, bulkheads, decks, hull plating) and maximum allowable stresses or loads
Beam Theory and Bending of Ships
- Bending of ships likened to bending of beams
- Calculating necessary strength of ships made difficult by varied forces (statical and dynamical)
- Statical forces include weight of structure, buoyancy forces, hydrostatic pressure, and concentrated local weights
- Dynamical forces include pitching, heaving, and rolling due to wind and waves
This quiz covers the importance of stress analysis in ship design, construction, and operation. It explains how stress tables vary depending on ship type, size, and intended use, and how different classification societies have their own standards and guidelines.
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