Analysis of Non-Linear Relationship between Specific Work of Fracture and Ligament of Polymeric Materials Using Modified EWF Model |
| Journal |
Key Engineering Materials (Volume 312) |
| Volume |
Fracture of Materials: Moving Forwards |
| Edited by |
Hong-Yuan Liu, Xiaozhi Hu and Mark Hoffman |
| Pages |
65-70 |
| DOI |
10.4028/www.scientific.net/KEM.312.65 |
| Online since |
June, 2006 |
| Authors |
Kai Duan,
Xiao Zhi Hu
|
| Keywords |
Boundary Effect, Essential Work of Fracture (EWF), Ligament, Polymer, Specific Work of Fracture |
| Abstract |
This paper explores the ligament-dependent behaviour of specific work of fracture of
polymeric materials using a recently-developed modified EWF model. It is demonstrated that the non-linear relationship between specific work of fracture (wf) and ligament length (l) is a result of specimen boundary influence on the evolution of plastic zone. A transition ligament (l*) is defined, below which, the height of under-developed plastic zone is equal to the ligament length, and as a
result, a linear wf-l relation will be observed. The plastic zone will saturate at the transition ligament, and its height will no longer increase when l > l*. This will result in a non-linear wf-l relation. Experimental wf-l data available in the literature are analysed using the modified EWF model and very good agreements are achieved. |
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