EFFECT OF MECHANICAL PRE-CONDITIONING ON FRACTURE RESISTANCE OF POLYPROPYLENE

Liang Han; Fang-ming Xiang; Yan-li Li; Ting Huang; Yong Wang; Ji-hong Zhang

doi:10.1007/s10118-011-1038-6

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EFFECT OF MECHANICAL PRE-CONDITIONING ON FRACTURE RESISTANCE OF POLYPROPYLENE

Paper | Updated：2021-06-21

- EFFECT OF MECHANICAL PRE-CONDITIONING ON FRACTURE RESISTANCE OF POLYPROPYLENE
- Chinese Journal of Polymer Science Vol. 29, Issue 3, Pages: 318-324(2011)
- Affiliations：
  
  Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
- Author bio：
  
  **Yong Wang (王勇), E-mail: yongwang1976@163.com
- Funds：
- DOI：10.1007/s10118-011-1038-6
  CLC：
- Received：12 April 2010，
  
  Revised：2010-05-17，
  
  Accepted：28 May 2010，
  
  Published：2011
- Accepted：
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Liang Han, Fang-ming Xiang, Yan-li Li, et al. EFFECT OF MECHANICAL PRE-CONDITIONING ON FRACTURE RESISTANCE OF POLYPROPYLENE[J]. Chinese Journal of Polymer Science, 2011, 29(3): 318-324.
DOI：

Liang Han, Fang-ming Xiang, Yan-li Li, et al. EFFECT OF MECHANICAL PRE-CONDITIONING ON FRACTURE RESISTANCE OF POLYPROPYLENE[J]. Chinese Journal of Polymer Science, 2011, 29(3): 318-324. DOI： 10.1007/s10118-011-1038-6.

摘要

Abstract

The effect of externally applied mechanical pre-conditioning

i.e

. pre-impact treatment

on the fracture resistance was investigated for polypropylene (PP). Impact strength was obtained

via

notched and/or unnotched samples. It has been shown that the pre-impact treatment is favorable to the improvement of the fracture resistance. The impact strength increases linearly with the applied pre-impact energy. Both optical and SEM results show that there are at least two possible mechanisms for the improvement of the fracture resistance. One is the crack blunting effect which is introduced to notched sample by pre-impact treatment

reducing the sensitivity of PP to the applied notch. The other is the formation of large amount of microvoids induced by pre-impact treatment

which changes the stress distribution and induces intensive plastic deformation of PP at the second impact measurement

leading to the improvement of the fracture resistance.

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