The experimental and numerical investigation of fracture behaviour in PMMA notched specimens under biaxial loading conditions – Tension with torsion

Elżbieta Bura; Wojciech Grodzki; Andrzej Seweryn

doi:10.1016/j.engfracmech.2024.110132

The experimental and numerical investigation of fracture behaviour in PMMA notched specimens under biaxial loading conditions – Tension with torsion

Abstract

This paper presents the results of experimental fracture test of flat PMMA specimens under biaxial loading condition tension with torsion (proportional). The specimens were made in two thicknesses: 5 and 15 mm and were weakened with V-type edge notches with different root radii: 0.5; 2 and 10 mm. Thanks to the ARAMIS 3D 4 M non-contact vision system, measurement of the elongation and twist angle were recorded. During experimental part all of the deformation processes were observed using PHANTOM cameras. Obtained records made it possible to precisely indicate the moment of crack initiation (tensile force and torsional moment values). Using the microscopic observations the location of crack initiations were determined. Results obtained for biaxial loading were compared with those obtained for uniaxial tension and torsion. Based on experimental data the numerical calculation with FEM were carried out. The principal stress and plastic strain distribution under critical load, were obtained. The points of occurrence of stress maxima and plastic strain were indicated, which were taken as potential crack initiation sites. On the basis of the stress and plastic strain values measured at the critical points, a stress–strain fracture criterion was formulated, which was then positively verified. Additionally, new form of stress–strain fracture criterion was proposed. The bilinear form of the fracture criterion can be successfully used to predict fracture in PMMA flat specimens, regardless of the notch root radius, type of load or element thickness.

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Authors (3)

Elżbieta Bura
- Politechnika Białostocka
Wojciech Grodzki
- Politechnika Białostocka
Andrzej Seweryn prof. dr hab. inż.

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Articles

Type:

artykuły w czasopismach

Published in:

ENGINEERING FRACTURE MECHANICS no. 303,
ISSN: 0013-7944

Language:

English

Publication year:

2024

Bibliographic description:

Bura E., Grodzki W., Seweryn A.: The experimental and numerical investigation of fracture behaviour in PMMA notched specimens under biaxial loading conditions – Tension with torsion// ENGINEERING FRACTURE MECHANICS -Vol. 303, (2024), s.110132-

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