Velocity jump in the crack propagation induced on a semi-crystalline polymer sheet by constant-speed stretching

POLYMER

卷:173

Article

Tomizawa, Takako¹  Okumura, Ko¹ 

[1] Ochanomizu Univ, Dept Phys, Bunkyo Ku, 2-1-1 Otsuka, Tokyo 1128610, Japan

关键词: Crack propagation;    Velocity jump;    Glass transition;    Semicrystalline polymers;   

DOI  :  10.1016/j.polymer.2019.04.009

来源: Elsevier

【 摘 要 】

It has long been known for elastomers that the velocity of crack propagation jumps as a function of strain. On the other hand, such a jump has not been reported in the literature for polymers which do not exhibit a rubbery plateau in the storage-modulus plot. Here, we report observation of jumps in crack propagation for semi-crystalline polymer sheets without the rubbery plateau, as a result of pulling the sheets at a constant speed. We discuss the advantages of this crack-propagation test under constant-speed stretching and provide physical interpretation of the velocity jump observed for non-elastomer sheets on the basis of a recently proposed theory for the velocity jump in crack propagation.

【 授权许可】

Free