Dual-Stiffness Behavior of Fatigued Tire Rubber
Dual-Stiffness Behavior of Fatigued Tire Rubber
复制标题
疲劳轮胎橡胶的双刚度行为
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
Erol Sancaktar
中科院分区：
文献类型：
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作者：
Ruofan Liu;Erol Sancaktar
我们报告了炭黑和二氧化硅填充的SBR基（丁苯橡胶）轮胎橡胶材料在循环加载后（而不是无循环的纯样品）的刚度值的二元性。我们认为，这种行为是由于循环引起的形态变化，而不一定是由于较大规模的空隙/裂纹萌生。原因可能是链断裂、所有样品中交联减少以及二氧化硅系统中的团聚体破碎/颗粒再分布，这代表了这些系统中的早期损伤引发和形态变化。因此，我们得到了一个双重刚度-应变行为，它基本上是两个单独的刚度-应变曲线的叠加，每个曲线都类似于纯（无疲劳）样本的刚度-应变曲线。我们认为，第二个叠加部分表示由于应变过程中循环载荷（较低的交联/重排颗粒分布）以及当未劣化/未重排部分变弱时，部分劣化/重排。
We report on duality in stiffness values for both carbon black and silica-filled SBR-based (styrene butadiene rubber) tire rubber materials after cyclic loading (and not with no-cycle, neat samples). We believe, this behavior is due to morphological changes occurring due to cycling and not necessarily due to larger scale void/crack initiation. Causes may be chain breakage, reduced crosslinking in all samples, and agglomerate break-up/particle redistribution in silica systems, which represent early damage initiation and morphological changes in these systems. Therefore, we get a dual stiffness vs. strain behavior which is essentially superposition of two separate stiffness vs. strain curves, each being similar to the stiffness-strain curves for the neat (no fatigue) samples. We believe that the second superposed portion represents the sections deteriorated/rearranged due to cyclic loading (lower crosslinking/rearranged particle distributions) coming in-line during the straining process, and when the non-deteriorated/non-rearranged sections weaken.Copyright © 2015 by ASME