Abstract In order to investigate the uniaxial ratchetting behaviors and fatigue failure of silicone seal adhesive bonded hollow cylinder butt-joints under uniaxial tensile and torsional cyclic loading, the effects of stress amplitude, mean stress, cycle time and loading history on the ratchetting strain, ratchetting strain rate and fatigue life were discussed respectively. The experimental results show that ratchetting strain appeared in both tensile and torsional cyclic loading. The ratchetting strain of tensile cycle evolved in three stages, while that of torsion cycle evolved in two stages. Furthermore, the effect of uniaxial tensile cycle on ratchetting strain is greater than that of uniaxial torsion cycle, and the fatigue life of torsion cycle is higher than that of tensile cycle. The stress amplitude, mean stress and cycle time have influence on the ratchetting strain, ratchetting strain rate and fatigue life of the adhesively bonded butt-joints. The ratchetting strain and ratchetting strain rate increase, and the fatigue life decreases with the increase of stress amplitude and mean stress, or the decrease of cycle time. In addition, it is also found that silicone seal adhesive bonded butt-joint has a strong memory of loading history for the stress amplitude. Prior stress cycle with higher stress amplitude restrains the ratchetting strain in subsequent cycle with lower stress amplitude.

中文翻译：

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硅密封胶粘接对接接头在拉伸和扭转循环载荷下的单轴棘轮和疲劳破坏行为研究

摘要 为了研究单轴拉伸和扭转循环加载下硅酮密封胶粘合空心圆柱对接接头的单轴棘轮行为和疲劳破坏，应力幅、平均应力、循环时间和加载历史对棘轮应变、棘轮的影响。分别讨论了应变率和疲劳寿命。实验结果表明棘轮应变出现在拉伸和扭转循环加载中。拉伸循环棘轮应变演化为三个阶段，扭转循环棘轮应变演化为两个阶段。此外，单轴拉伸循环对棘轮应变的影响大于单轴扭转循环，并且扭转循环的疲劳寿命高于拉伸循环的疲劳寿命。应力幅值，平均应力和循环时间对粘接对接接头的棘轮应变、棘轮应变率和疲劳寿命有影响。随着应力幅值和平均应力的增加，或循环时间的减少，棘轮应变和棘轮应变率增加，疲劳寿命降低。此外，还发现硅胶密封胶粘接对接接头对应力幅值具有较强的加载历史记忆。具有较高应力幅值的前一个应力循环抑制了随后具有较低应力幅值的循环中的棘轮应变。或减少循环时间。此外，还发现硅胶密封胶粘接对接接头对应力幅值具有较强的加载历史记忆。具有较高应力幅值的前一个应力循环抑制了随后具有较低应力幅值的循环中的棘轮应变。或减少循环时间。此外，还发现硅胶密封胶粘接对接接头对应力幅值具有较强的加载历史记忆。具有较高应力幅值的前一个应力循环抑制了随后具有较低应力幅值的循环中的棘轮应变。