کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
770904 | 897582 | 2010 | 10 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Surface effects on mode-I crack tip fields: A numerical study Surface effects on mode-I crack tip fields: A numerical study](/preview/png/770904.png)
Surface energy often significantly influences the deformation and failure behavior of materials and devices at the nanoscale. However, how it alters the local deformation around a crack tip remains unclear. In the present paper, we investigate the surface effects on the near-tip fields of a mode-I blunt crack (or notch). The theory of surface elasticity is incorporated into the finite element method. It is found that when the curvature radius of the crack root shrinks to nanometers, surface effects considerably affect the local stress distributions near the crack tip. We also calculate the J-integral, which is almost independent of surface effects except when the integral path approaches the crack tip. This demonstrates that surface effects are localized in a small zone around the crack tip, where the classical fracture mechanics solutions neglecting surface effects should be modified.
Journal: Engineering Fracture Mechanics - Volume 77, Issue 7, May 2010, Pages 1048–1057