Journal
POLYMER TESTING
Volume 41, Issue -, Pages 73-81Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymertesting.2014.10.011
Keywords
Fracture toughness; Essential work of fracture (EWF); Polypropylene; Multiple stress fractures
Funding
- Wisconsin Institute for Discovery (WID)
- China Scholarship Council (CSC)
- National Nature Science Foundation of China [11172271]
- National Program on Key Basic Research Project (973 Program) [2012CB025904]
- Graduate School of the University of Wisconsin-Madison
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In recent years, the essential work of fracture (EWF) method has been extensively employed for assessing a material's toughness by specific essential fracture work, especially for polymers showing ductile failure. However, most research has studied either the in-plane stress mode or the out-of-plane stress mode. To obtain a more in-depth understanding of the EWF theory, the specific essential and non-essential fracture work of polypropylene random copolymer (PP-R) was investigated in both in-plane stress mode and out-of-plane stress mode. The effects of ligament length, amount of pre-cracking and pre-cracking method on the specific essential and non-essential fracture work were explored. The specific essential fracture work obtained in both stress modes is compared and discussed. (C) 2014 Elsevier Ltd. All rights reserved.
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