Lee Pyoung-Chan, Kim Su Young, Ko Youn Ki, Ha Jin Uk, Jeoung Sun Kyoung, Lee Ju-Yub, Kim Minsu
Materials Technology R&D Division, Korea Automotive Technology Institute, Cheonan-si 31214, Chungnam, Korea.
Reliability R&D Division, Korea Automotive Technology Institute, Cheonan-si 31214, Chungnam, Korea.
Polymers (Basel). 2022 May 17;14(10):2047. doi: 10.3390/polym14102047.
This study investigated the service life prediction of fluorocarbon elastomers that are used in automotive vapor fuel hoses under thermal environments. The changes in mechanical properties such as the tensile strength, elongation, compression set (CS), and hardness according to thermal aging were investigated for two types of ternary fluoroelastomers. Destructive tests of the tensile strength and elongation showed large variations in the mechanical properties under the same condition because there is no continuity of samples. In contrast, nondestructive tests of the CS and hardness showed little variations in the mechanical properties under the same condition. The elongation, CS, and hardness were selected as the physical parameters for service life prediction as they showed a tendency according to the aging temperature, which is an accelerating factor. The effective activation energy derived using each physical parameter was 74.91-159.6 kJ mol, and the service life was 17.8-140 × 10 h based on B. In this study, hardness, which has a small deviation between samples, is considered appropriate as mechanical parameter for predicting the service lifetime.
本研究调查了用于汽车蒸汽燃料软管的氟碳弹性体在热环境下的使用寿命预测。针对两种三元氟弹性体，研究了热老化后拉伸强度、伸长率、压缩永久变形（CS）和硬度等机械性能的变化。拉伸强度和伸长率的破坏性测试表明，在相同条件下机械性能存在很大差异，因为样品没有连续性。相比之下，CS和硬度的非破坏性测试表明，在相同条件下机械性能变化很小。由于伸长率、CS和硬度随老化温度（加速因素）呈现出一定趋势，因此将它们选为使用寿命预测的物理参数。使用每个物理参数得出的有效活化能为74.91 - 159.6 kJ/mol，基于B的使用寿命为17.8 - 140×10小时。在本研究中，样品间偏差较小的硬度被认为是预测使用寿命的合适机械参数。
