Size effects on brittle fracture of Brazilian disk samples containing a circular hole

•Brazilian disks tests are carried out on brittle samples containing a circular hole.•Tests involve two materials (PMMA and GPPS) and five different hole sizes.•Size effects are investigated through the coupled FFM criterion.•The matching between experimental and theoretical results is generally sat...

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Bibliographic Details
Published in:Engineering fracture mechanics 2017-12, Vol.186, p.496-503
Main Authors: Torabi, A.R., Etesam, S., Sapora, A., Cornetti, P.
Format: Article
Language:English
Subjects:
Brazilian disk tests
Brittle failure
Brittle fracture
Brittleness
Circular hole
Failure mechanisms
Finite Fracture Mechanics
Fracture mechanics
Fractures
Polymethyl methacrylate
Polystyrene resins
Size effects
Stress intensity factors
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Summary:•Brazilian disks tests are carried out on brittle samples containing a circular hole.•Tests involve two materials (PMMA and GPPS) and five different hole sizes.•Size effects are investigated through the coupled FFM criterion.•The matching between experimental and theoretical results is generally satisfactory. Brittle fracture tests are carried out on Brazilian disk specimens containing a circular hole. The experimental campaign involves two different polymeric materials, Polymethyl-methacrylate (PMMA) and general-purpose Polystyrene (GPPS), respectively. Keeping fixed the disk diameter, five different hole sizes are tested for each material sample, thus allowing a full description of the related size effects. The recorded failure stresses are compared with theoretical predictions by the coupled Finite Fracture Mechanics criterion, which is originally implemented for the geometry under investigation by means of analytical relationships for the stress field and the stress intensity factor available in the Literature. The agreement is generally satisfactory, except from very small holes where some nonlinear effects influenced the failure mechanisms.
ISSN:0013-7944
1873-7315
DOI:10.1016/j.engfracmech.2017.11.008