Candau Nicolas, Oguz Oguzhan, Peuvrel-Disdier Edith, Bouvard Jean-Luc, Maspoch María Lluïsa, Corvec Guillaume, Pradille Christophe, Billon Noëlle
Centre Català del Plàstic (CCP)-Universitat Politècnica de Catalunya Barcelona Tech (EEBE-UPC), Av. D'Eduard Maristany, 16, 08019 Barcelona, Spain.
Faculty of Engineering and Natural Sciences, Materials Science and Nano Engineering, Sabanci University, Orhanli, Tuzla, Istanbul 34956, Turkey.
Polymers (Basel). 2020 Dec 17;12(12):3021. doi: 10.3390/polym12123021.
The effect of the strain rate on damage in carbon black filled Ethylene Propylene Diene Monomer rubber (EPDM)stretched during single and multiple uniaxial loading is investigated. This has been performed by analyzing the stress-strain response, the evolution of damage by Digital Image Correlation (DIC), the associated dissipative heat source by InfraRed thermography (IR), and the chains network damage by swelling. The strain rates were selected to cover the transition from quasi-static to medium strain rate conditions. In single loading conditions, the increase of the strain rate yields in a preferential damage of the filler network while the rubber network is preserved. Such damage is accompanied by a stress softening and an adiabatic heat source rise. Conversely, increasing the strain rate in cyclic loading conditions yields in a filler network accommodation and a high self-heating whose combined effect is proposed as a possible cause of the ability of filled EPDM to limit damage by reducing cavities opening during loading, and favoring cavities closing upon unloading.
研究了应变率对在单轴和多轴加载过程中拉伸的炭黑填充三元乙丙橡胶（EPDM）损伤的影响。这是通过分析应力-应变响应、利用数字图像相关技术（DIC）分析损伤的演变、利用红外热成像（IR）分析相关的耗散热源以及通过溶胀分析链网络损伤来实现的。选择应变率以涵盖从准静态到中等应变率条件的转变。在单加载条件下，应变率的增加导致填料网络优先受损，而橡胶网络得以保留。这种损伤伴随着应力软化和绝热热源的增加。相反，在循环加载条件下增加应变率会导致填料网络的适应性变化和高自热现象，其综合作用被认为是填充EPDM能够通过减少加载过程中的空洞开口以及促进卸载时的空洞闭合来限制损伤的可能原因。
