| 摘要 |
<p>[Problem] To provide a simple method for estimating the frictional resistance increase rate of a ship bottom coating film, the method providing evaluation results rapidly and without individual differences. [Solution] A method for estimating the frictional resistance of a ship bottom coating film characterized in that: according to the stipulations of JIS B 0601: 2001 (ISO 4287: 1997), any of Rz (maximum height roughness), Rc (mean height of roughness curve element), Ra (arithmetic mean roughness), Rq (root mean square roughness), or RZJIS (ten-point mean roughness) is measured as the roughness height R of a coating film of a bottom paint coated on a base material with the mean length RSm of a roughness curve element in the range of 2,000 - 10,000 µm; and the frictional resistance increase rate FIR (%) from a mirror finished surface is calculated using equation (1). (In the formula, the coefficient C is a constant that depends on the variety of the roughness height R and the frictional resistance test method. Roughness measurements at a fixed evaluation length and frictional resistance tests are performed beforehand on multiple bottom paints of differing roughness and C is determined from the relationship in equation (1) for the measured roughness heights R, mean lengths of the roughness curve element RSm, and the frictional resistance increase rates FIR (%).)</p> |
