The fatigue tests under the out-of-plane compressive and slight tensile loading are conducted in order to investigate the fatigue strength of paper-based friction materials and evaluate the influence of the constituents of friction materials on fatigue strength. The out-of-plane compressive tests are also carried out to evaluate damage behavior of friction materials. The cross-section of the materials is observed by scanning electron microscope in order to evaluate damage evolution in microstructure of the material. The constituents of the friction materials are aramid, cellulose and phenolic resin. From the static and fatigue tests, the fatigue strength of the friction materials decreases with increasing the number of cycles. The static and fatigue strengths of the friction material composed of aramid fiber and phenolic resin are higher than that of the friction material composed of cellulose fiber and phenolic resin. From the out-of-plane compressive tests, the damage evolution, such as crack initiation and fiber breakage, is observed. The damage ratio of the cellulose-based friction material is higher than aramid-based friction material. The damage behavior of the friction materials under the out-of-plane compressive loading may affect the fatigue strength of the friction materials.
抄録全体を表示