Our site uses cookies necessary for its proper functioning. To improve your experience, other cookies may be used: you can choose to disable them. This can be changed at any time via the Cookies link at the bottom of the page.

Analysis of Enhanced Resistance to Slow Crack Growth in PE Materials [PE]


Plastic Pipes Conference Association # 1992 Eindhoven


The effect of blunting at crack-like notches on the apparent subcritical toughness measured in terms of slow crack growth is discussed with regard to mechanics and materials aspects. Notch tip blunting is shown to rationalize the apparent enhanced subcritical toughness trends, leading to so-called super tough materials. The development of the blunting is argued to depend on the material's compliance and the critical stress for crazing, expressed in terms of the triaxial notch tip stress field. Inherent toughness is compared to apparent toughness by a simple test that generates SCG under high triaxiality. Under the high triaxiality developed in this fashion, there is little evidence of the enhanced cracking resistance expected of super tough materials. It is concluded that the benefits of differences in apparent subcritical toughness in the various polyethylene gas pipe materials are difficult to assess quantitatively using presently available methods. KEY WORDS Slow crack growth, apparent toughness, blunting, compliance, and notch stress fields.

Please note that the whole article content is available on PPCA website only :

Members of the Association

BOREALISBOROUGEFormosa Plastics CorporationHanwha TotalEnergiesINEOS O&PIRPCKorea Petrochemical IND. Co., LTD (KPIC)LyondellBasellORLEN UnipetrolPetroChina Dushanzi Petrochemical CompanyPRIME POLYMERSABICSCG Chemicals & Thai PolyethyleneSinopecTASNEE