A novel essential work of fracture experimental methodology for highly dissipative materials

POLYMER

卷:117

Article

Skamniotis, C. G.¹  Kamaludin, M. A.¹  Elliott, M.²  Charalambides, M. N.¹ 

[1] Imperial Coll London, Dept Mech Engn, London SW7 2AZ, England

[2] Mars Petcare, Oakwell Way, Birstall WF17 9LU, Batley, England

关键词: EWF;    Polymer;    Strain rate;    Remote dissipation;    Crack speed;    Crack tip blunting;   

DOI  :  10.1016/j.polymer.2017.03.057

来源: Elsevier

【 摘 要 】

Determining fracture toughness for soft, highly dissipative, solids has been a challenge for several decades. Amongst the limited experimental options for such materials is the essential work of fracture (EWF) method. However, EWF data are known to be strongly influenced by specimen size and test speed. In contrast to time-consuming imaging techniques that have been suggested to address such issues, a simple and reproducible method is proposed. The method accounts for diffuse dissipation in the specimen while ensuring consistent strain rates by scaling both the sample size and testing speed with ligament length. We compare this new method to current practice for two polymers: a starch based food and a polyethylene (PE) tape. Our new method gives a size independent and more conservative fracture toughness. It provides key-data, essential in numerical models of the evolution of structure breakdown in soft solids as seen for example during oral processing of foods. (C) 2017 Elsevier Ltd. All rights reserved.

【 授权许可】

Free