ばね鋼のフレッティング疲労に及ぼす接触材の影響

概要

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Fretting fatigue strengths of high strength spring steel (JIS SUP9) were examined by clamping the contact pads of various materials ; the same steel, low strength carbon steel (SS41), plastics (POM) and ceramics (Si_3N_4). The fretting at a contact pressure of 60 MPa {6.1kgf/mm^2} reduced the fatigue strength by a factor of 1.92 for SUP9 contact pad and 1.68 for SS41 contact pad. The ceramics contact pads were similar to SUP9 steel contact pad, whereas the plastics contact pads did not cause the fretting. The friction coefficients between the contact pads and the specimen increased in proportion to the appropriate relative slip amplitudes, but attained to a saturation dependent on the contact materials. The saturation values were 0.6 for SUP9 steel, 0.34 for SS41 steel and 0.13 for POM. Cyclic J-integral concepts were successfully employed to predict crack propagation lives using measured data on the frictional forces.
一般社団法人日本機械学会の論文
1985-04-25