Which of the following describes a vessel...

🔍 Key Concepts

• Hogging vs. sagging – how a ship bends in a wave trough or crest • Where tension (tensile stress) and compression (compressive stress) occur when a ship bends upward in the middle • Difference between deck plating stresses and bottom plating stresses when the ship is supported more at bow and stern than in the middle

💭 Think About

• Picture the ship on a wave so that the bow and stern are supported, but the middle is not – is the ship bending upward (hogging) or downward (sagging)? • When the hull bends upward in the middle, is the upper part (deck) being stretched or squeezed? What about the bottom plating? • Match the type of stress (tensile vs. compressive vs. the distractor terms) with what would realistically happen to steel if it is being stretched vs. pushed together.

✅ Before You Answer

• Make sure you know whether hogging means the ship’s middle is higher or lower than the ends. • Identify which part of the structure (deck vs. bottom) would be in tension and which in compression for that bending shape. • Eliminate any options that use stress terms that don’t normally describe global longitudinal bending of a hull (e.g., shearing, ductile) in this basic definition question.

Which of the following describes a vessel which is subjected to "hogging"?

It has its main deck plating under tensile stress.

It has its bottom plating under shearing stress.

It has its main deck plating under compressive stress.

It has its bottom plating under ductile stress.

🔍 Key Concepts

💭 Think About

✅ Before You Answer