摩擦面の破壊機構と高摩擦鋼板の開発

Abstract

For developing high-strength bolted friction joints with much higher friction coefficients than conventional ones, friction mechanisms are studied first and then based on the mechanisms, conditions for realizing high friction coefficients should be clarified. Friction coefficients between steels with different hardness are discussed. Failure modes on the friction surface are examined theoretically and a new friction theory is established. This theory provides that friction coefficients depend on the following factors : shapes and angles of surface projection of the steel with higher hardness, hardness ratio of harder steel to softer one and stress ratio of compression stress on friction surface to tensile strength of softer steel. A friction coefficient of 1.2 becomes possible from the new provided friction theory.