Formula for IWRC

Formula for IWRC

• A. D^2 x 50
• B. D x 45
• C. 2D^2 x 45
• D. D^2 x 45

Answer: (D)

Independent Wire Rope Core (IWRC) properties relate to cross-sectional area, which grows with the square of the diameter. So the calculation must involve the diameter squared. The fixed coefficient of 45 is the standard conversion factor used in this handbook to convert that area into the IWRC value in the chosen units. Using a linear dependence on diameter or doubling the area would misrepresent how the core’s size scales, and a different coefficient would correspond to a different core type. Thus the correct form is the diameter squared multiplied by 45.

Independent Wire Rope Core (IWRC) properties relate to cross-sectional area, which grows with the square of the diameter. So the calculation must involve the diameter squared. The fixed coefficient of 45 is the standard conversion factor used in this handbook to convert that area into the IWRC value in the chosen units. Using a linear dependence on diameter or doubling the area would misrepresent how the core’s size scales, and a different coefficient would correspond to a different core type. Thus the correct form is the diameter squared multiplied by 45.