🔍 Key Concepts

• Difference between hogging and sagging stresses along a ship’s length • Where tension and compression occur in the hull when a ship sags • Location and structural role of the sheer strake in the ship’s side shell and deck area

💭 Think About

• Visualize the ship in a sagging condition: is the middle supported more by water or less? Does the bow and stern tend to be higher or lower than midships? • In that sagging shape, think of the hull as a beam: which parts of the beam are being stretched, and which parts are being squeezed? • Since the sheer strake is located near the deck edge along the side, would it behave more like the top fibers of a bent beam or the bottom fibers in sagging?

✅ Before You Answer

• Confirm in your mind whether, in sagging, the deck region (including sheer strake) is in tension or compression. • Recall that the bottom shell plating experiences the opposite type of stress from the deck in longitudinal bending. • Eliminate any choices that do not describe a basic longitudinal bending stress (focus on tension vs compression, not other types).