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由于尼龙类材料易于吸收环境中的水分,进而在不同湿度条件下体现出不同的力学特性,因此,论文研究了以尼龙6为典型对象,通过两种相对吸湿度(RHs=0、1.0和2.12%)下的应力控制循环变形实验,研究了相对吸湿度对尼龙类材料的单轴棘轮行为的影响,讨论了不同相对吸湿度和不同峰值应力保持时间(即0、5和10s)下该类材料的棘轮变形特征.实验结果表明:尼龙类材料在非对称应力循环加载过程中产生了明显的棘轮行为,其棘轮变形包括可恢复的粘弹性和不可恢复的粘塑性变形两部分;棘轮应变随着峰值保持时间的增加而增加,体现出明显的时间相关性;相对吸湿度越高,棘轮效应越明显,不可恢复的粘塑性变形所占份额越大.
Because nylon materials are easy to absorb the moisture in the environment, and then show different mechanical properties under different humidity conditions, the paper studied the nylon 6 as a typical object through two relative humidity (RHs = 0,1.0 and 2.12 %), The effects of relative moisture absorption on the uniaxial ratcheting behavior of nylon-based materials were studied. The effects of different relative hygroscopicity and different peak stress holding time (ie, 0, 5 and 10 s) The experimental results show that the nylon material has obvious ratcheting behavior during asymmetric stress cycle loading, the ratchet deformation includes recoverable viscoelasticity and non-recoverable viscoplastic deformation. The ratcheting strain The peak retention time increases with time, showing a significant temporal correlation; the higher the relative moisture absorption, the more obvious ratcheting effect, the greater the share of non-recoverable viscoplastic deformation.