Study on Strain Fatigue Properties of Silane Modified Polyether Sealant
The study investigated the strain fatigue properties of 4 types of silane-modified polyether(MS)sealants under different conditions.The results indicate that the shear strain frequency will not change the service life of MS sealant,but it will significantly change the duration.It is advisable to select a shear strain frequency of 10 Hz.The greater the average strain,the shorter the service life of MS sealant.With a fixed strain ratio of 0.1,MS sealants show no damage after 10 million cycles of strain when the average strain is not exceed 1.25 mm.After D4 curve environmental aging according to ISO standard 9142:2003,4 types of MS sealant has the service life of exceed 10 million cycles,a modest decrease in shear strength and a marked increase in shear fracture elongation.The shear strength declines a little,and the shear break elongation increaseds significantly,MS seal-ant 4# has been disbonded from the substrate,yet the shear strength retention rate exceeds 80％after aging.The MS sealant strain fatigue test provides references for the design of MS sealant applied in rail vehicles,aviation and other fields.
silane modified polyether sealantstrainfatigueservice life
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