| کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
|---|---|---|---|---|
| 1641271 | 1517213 | 2016 | 5 صفحه PDF | دانلود رایگان |
کلمات کلیدی
1)مقدمه
2) روش تجربی
3) نتایج و بحث
4) نتیجه گیری
• Samples of fully dense, pure alumina with an equiaxial grain structure were prepared.
• A demonstration of the damage introduced during low load, low velocity, blunt impacts is provided.
• The generation of a well-formed and measurable impression is observed for the first time.
• Fracturing is shown to play an insignificant role in the process.
• Plastic deformation around and beneath the residual cavity is proposed as the core contributor.
We present our findings after scaled-down drop-weight tests, performed under relatively low loading conditions and employing a small-scale spherical indenter as a projectile, to boost the strain rate and energy density of the impact, resulted in the generation of a cavity of measurable depth on the surface of a pure, fully dense, alumina ceramic. We demonstrate that activated dislocations are a main contributor in the formation of the residual impression with an estimated maximum density of ~4.02×1014 m−2.
Journal: Materials Letters - Volume 175, 15 July 2016, Pages 143–147