Stress Analysis in Ship Design

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.