湿式ペーパ摩擦材の真実接触部解析（第1報）: なじみしゅう動の真実接触面積に及ぼす影響

摘要

真実接触部に関する情報は，2面間で発生する摩擦の大きさおよびその特性に直接関与する重要な因子である．さらに接触時のアライメントの状態は真実接触状況を大きく変化させるので，信頼性の高い実験結果を得るためにその管理や対策は必須の事項である．既報で述べた湿式ペーパ摩擦材は可撓性に富むとはいえ，対策をとらなければ片当たりのアライメント状態が発生することは，しばしば経験される．%Under non-lubricating conditions, the real contact area (Area 1) and its vicinity of micro-gap (Area 2) which influence the frictional characteristics of paper-based wet friction materials, were statistically measured. The effects of the number of running-in cycles (N) and the contact pressure on Area 1 and Area 2 were examined by measuring the reduction in thickness of the friction material and by conducting particle analysis considering the real contact points. The results are as follows: Area 1 increased with N and contact pressure, but hysteresis behavior appeared in the unloading process. However, no hysteresis was observed in the thickness reduction of the friction material. (2) As N increased, Area 1 increased but there was little increase in Areal 2. (3) The average real contact pressure obtained from nominal contact pressure and also the number of contact points (n) based on particle analysis decreased with N, owing to the increase in n. (4) Regardless of contact pressure and N, the relation between Area 1 and n was expressed as a line with a folding point where the slope changed.