Fatigue crack nucleation and growth in filled natural rubber
Fatigue crack nucleation and growth in filled natural rubber
复制标题
DOI：
10.1046/j.1460-2695.2003.00678.x
复制
发表时间：
2003-09-01
影响因子：
3.7
通讯作者：
Fatemi, A
中科院分区：
文献类型：
--
作者：
Mars, WV;Fatemi, A
承受波动载荷的橡胶部件经常由于成核和缺陷或裂纹的生长而失效。预防此类故障取决于对故障过程的力学基础的理解。本研究探讨了填充天然橡胶中裂纹的成核和扩展。分别采用简单拉伸和平面拉伸试样进行了疲劳宏观裂纹形核和疲劳裂纹扩展实验。裂纹形核和裂纹扩展寿命预测分析方法被用来关联实验数据。文中还讨论了疲劳过程的几个方面，如失效模式和R比（最小应变）对疲劳寿命的影响。结果表明，一个小的正R比可以有显着的有益效果的疲劳寿命和裂纹扩展速率，特别是在低应变范围。
Rubber components subjected to fluctuating loads often fail due to nucleation and the growth of defects or cracks. The prevention of such failures depends upon an understanding of the mechanics underlying the failure process. This investigation explores the nucleation and growth of cracks in filled natural rubber. Both fatigue macro-crack nucleation as well as fatigue crack growth experiments were conducted using simple tension and planar tension specimens, respectively. Crack nucleation as well as crack growth life prediction analysis approaches were used to correlate the experimental data. Several aspects of the fatigue process, such as failure mode and the effects of R ratio (minimum strain) on fatigue life, are also discussed. It is shown that a small positive R ratio can have a significant beneficial effect on fatigue life and crack growth rate, particularly at low strain range.