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Elastoplastic and fracture behaviour of semi-crystalline polymers under multiaxial stress states
- Source :
- Frattura ed Integrità Strutturale, Vol 13, Iss 47, Pp 82-103 (2019), Frattura ed Integrità Strutturale, Vol 13, Iss 47 (2018), Frattura ed Integrità Strutturale; Vol 13 No 47 (2019): January 2019; 82-103, Frattura ed Integrità Strutturale; V. 13 N. 47 (2019): January 2019; 82-103
- Publication Year :
- 2019
- Publisher :
- Gruppo Italiano Frattura, 2019.
-
Abstract
- The deformation behaviour and fracture mechanisms of high-density polyethylene (HDPE), polypropylene (PP) and polyamide 6 (PA 6) are investigated experimentally under different stress states and at different crosshead speeds of 1, 20 and 200 mm/min. Fracture surface morphologies were investigated in a series of specimens tested at 200 mm/min under combined tension/shear loading at three different loading angles (α= 0°, 30° and 90°) at room temperature (RT) and 50 °C. In addition, the effects of notch profile radii (stress triaxiality) on HDPE, PP and PA 6 fracture behaviour have been studied at RT, using flat and cylindrical notched specimens. Specimens’ geometries were carefully designed to achieve various loading conditions and allowing to explore initial stress triaxialities ranged from 0 in pure shear loading (α= 0°) to a maximum of 0.84 for flat notched specimens with radius of 5 mm. The yield load shows an explicit dependency on temperature and crosshead speed. The fracture surfaces analysed reveals damage mechanisms such as crazing, void and cavitation formation. Two or more mechanisms are predominant, which means that the stresses along fracture process are not uniform.
- Subjects :
- Polypropylene
Butterfly specimen
Void (astronomy)
Materials science
Crazing
Multiaxial loading
Mechanical Engineering
lcsh:Mechanical engineering and machinery
Semi-crystalline polymers
lcsh:TA630-695
lcsh:Structural engineering (General)
Pure shear
Polyethylene
Stress triaxiality
Crosshead
chemistry.chemical_compound
Fracture
chemistry
Mechanics of Materials
Cavitation
SEM
lcsh:TJ1-1570
High-density polyethylene
Composite material
Subjects
Details
- Language :
- English
- ISSN :
- 19718993
- Volume :
- 13
- Issue :
- 47
- Database :
- OpenAIRE
- Journal :
- Frattura ed Integrità Strutturale
- Accession number :
- edsair.doi.dedup.....611c3fb023a92abc38f2e390901b2d54