I suggest you refer to ALA Guidelines for the Design of Buried Steel Pipe (2001) Section B.1 Page 68. I am assuming a coefficient for fiberboard to soil would work to. The friction coefficients considered below are for static friction cases where two solid surfaces in contact with each other are resisting relative lateral motion. So, Using 26 degrees as the delta, phi would be 4*26/3, or about 35 degrees. Friction between sand and steel is studied by laboratory tests under repeated loading. It should be noted that there can be significant differences between static friction (typically higher) and kinetic (sliding) friction. Coal is transformed into coke. Is anyone aware of a "standard" coefficient of friction between this fiberboard and base? The value of μ s is generally higher than the value of μ k for a given combination of materials.. Coefficients of friction between materials are best determined through testing. The making of steel involves many processes and stages. Its definition is derived from the Mohr-Coulomb failure criterion and is used to describe the friction shear resistance of soils together with the normal effective stress. This is reasonable, assuming the soil is properly compacted, and you have the right type of soil. The tank manufacturer is providing a 1/2" thick fiberboard that will be placed between the tank and the foundation/crushed base. (2) The critical value of steel roughness is the boundary value whether interface sliding occurs or not. Static and Kinetic coefficient of friction . The friction angle (delta) between timber piles and soil is 3/4 of phi. After sliding had occurred between steel and a soil with a high clay fraction, however, the residual coefficient of friction at the applied displacement of 15 mm was much smaller than the maximum coefficient of friction. Alternatively, it may be akin to an α factor, which can be described as τ/s u , where τ is the interface shear stress and … Image Source: Wiki It should be noted that there can be significant differences between static friction (typically higher) and kinetic (sliding) friction. Static Friction Coefficients. Without knowing the specifics, the coefficient of friction may be described as the ratio tanδ/tanΦ' (where Φ' is internal friction angle). (2) The critical value of steel roughness is the boundary value whether interface sliding occurs or not. where μ s is the coefficient of static friction and μ k is the coefficient of kinetic friction. The basic raw materials are coal, iron ore, limestone and various chemicals. Or if worst comes to worst, a coefficient for steel to the base. After sliding had occurred between steel and a soil with a high clay fraction, however, the residual coefficient of friction at the applied displacement of 15 mm was much smaller than the maximum coefficient of friction. The coefficient of static friction for steel is around 0.6–0.15 and the coefficient of kinetic friction is around 0.09–0.6. The friction coefficients considered below are for static friction cases where two solid surfaces in contact with each other are resisting relative lateral motion. However, it is possible to find tables in the literature for friction coefficients between various materials. Fig.1: Showing the Concept of Coefficient of Friction . Introduction. Soil friction angle is a shear strength parameter of soils. The static and kinetic friction coefficient values reference table shown in this article will be helpful for finding the COF values of commonly used materials. 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