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根据对比,选用四点弯曲疲劳试验来评价木质纤维、聚丙烯腈及矿物纤维等3种纤维对SMA疲劳性能的影响。四点弯曲疲劳试验结果表明,就初始劲度模量而言,在3种应变水平下掺加木质纤维SMA最大,而掺加矿物纤维SMA和掺加聚丙烯腈SMA则较小。就滞后角而言,3种掺加纤维SMA的粘弹性性能差别不大。疲劳寿命与应变水平表现出了较好的相关性,疲劳寿命曲线的走向大致相同。相同应力水平下,掺加聚丙烯腈SMA的疲劳寿命最长,掺加矿物纤维SMA次之,掺加木质纤维SMA较差。
According to the comparison, four-point bending fatigue test was adopted to evaluate the effect of three kinds of fibers, such as lignin, polyacrylonitrile and mineral fiber, on the fatigue properties of SMA. Four-point bending fatigue test results show that, in terms of the initial stiffness modulus, the maximum of SMA is at the three strain levels, while that of SMA with SMA and spiked with polyacrylonitrile is smaller. In the case of lag angle, the viscoelastic properties of the three types of spun fibers are not significantly different. Fatigue life and strain level showed a good correlation, the trend of fatigue life curve roughly the same. At the same stress level, the fatigue life of SMA with spiked polyacrylonitrile was the longest, followed by SMA with spiked mineral fiber, and SMA with spiked wood fiber was inferior.