The Effect of Polymer Pipe Weld Geometry on Creep Lifetime

被引：6

作者：

Sevcik, Martin ^{[1
]}

Knesl, Zdenek ^{[1
]}

Hutar, Pavel ^{[1
]}

Nahlik, Lubos ^{[1
]}

机构：

[1] Acad Sci Czech Republic, Inst Phys Mat, Brno 61662, Czech Republic

来源：

MATERIALS STRUCTURE & MICROMECHANICS OF FRACTURE | 2011年 / 465卷

关键词：

creep; stress concentration factor; lifetime; triaxiality;

D O I：

10.4028/www.scientific.net/KEM.465.175

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

In the case of large diameter polyethylene (PE) and polypropylene (PP) pipes the most usual joint is the butt weld. This paper focuses on the influence of a weld bead on the service life of welded pipes from a fracture mechanics perspective. To this aim the stress concentrator created by the connection between the weld bead and the pipe's free surface is modelled as a notch. Global parameters defining properties of stress and strain field in the notch region are calculated for materials with a prevailing Norton-type creep. It is demonstrated that in the case of creep loading conditions and ductile failure mode the existence of such stress concentrators has no negative influence on the lifetime of pipes.

引用

页码：175 / 178

页数：4