Fracture toughness determination of bearing steel using chevron-notch three point bend specimen

1984 ◽  
Vol 19 (2) ◽  
pp. 221-232 ◽  
Author(s):  
Shang-Xian Wu
Keyword(s):  
Fracture Toughness ◽  
Bearing Steel ◽  
Bend Specimen ◽  
Chevron Notch ◽  
Point Bend

The Application of Miniaturized Three-Point-Bend Specimens for Determination of the Reference Temperature of JRQ Steel

2015 ◽  
Author(s):  
Ludek Stratil ◽  
Filip Siska ◽  
Ivo Dlouhy ◽  
Marta Serrano
Keyword(s):  
Fracture Toughness ◽  
Transition Region ◽  
Low Temperatures ◽  
Master Curve ◽  
Reference Temperature ◽  
Test Material ◽  
Bend Specimen ◽  
Valid Data ◽  
Point Bend

This contribution deals with determination of the reference temperature of JRQ steel using miniaturized specimens. The dimensions of used miniaturized specimens were 3 × 4 × 27 mm (thickness × width × length). This specimen type offers the utilization of limited amount of test material or broken halves of precracked Charpy and larger specimens. The test material comes from the broken halves of 0.5T SEB specimens previously tested for purposes of the reference temperature determination in Ciemat, Madrid. The fracture toughness tests of specimens were performed in the transition region of the steel according to the recommendations of standard ASTM E1921 and according Wallin’s recommended temperature range for miniaturized specimens. The determined reference temperature of the Master Curve was very similar to the determined ones from three-point-bend specimen of sizes 0.2T, 0.4T and 0.5T. The obtained results confirm a necessity of conduct of tests at low temperatures and testing sufficient number of specimens in order to generate enough valid data for determination of the reference temperature.

Interfacial Characterisation in Transparent Spinel Matrix Reinforced by SiC Fibre

2009 ◽  
Vol 409 ◽  
pp. 252-259 ◽  
Author(s):  
Zdeněk Chlup ◽  
Ivo Dlouhý ◽  
Selen Gürbüz ◽  
Arcan F. Dericioglu ◽  
Vladislav Kozák
Keyword(s):  
Fracture Toughness ◽  
Composite Materials ◽  
Experimental Determination ◽  
Fracture Behaviour ◽  
Composite Ceramics ◽  
Final Fracture ◽  
Chevron Notch ◽  
Interface Characteristics ◽  
Propagating Crack

The behaviour of a propagating crack when an interface is present is a key feature in composite materials. This interaction usually predetermines final fracture behaviour of the material. In case of ceramic based composites (particle, fibre reinforced, laminates etc.) knowledge about properties of the interface and/or interlayer is usually unknown due to difficulties associated with their experimental determination. The aim of this work is to indicate a possible way for the determination of interface characteristics suitable as inputs for numerical calculations. The introduced testing methodology was tested on spinel composite ceramics reinforced by unidirectional SiC fibre. The adopted method for fracture toughness determination is using a chevron notch technique. Additionally, fractographical techniques were used when interpreting the measured values.

scholarly journals Non-traditional Approach to the Evaluation of the Freeze-thaw Resistance of Concrete based on the Fracture Tests

2020 ◽  
Vol 322 ◽  
pp. 01015
Author(s):  
Barbara Kucharczyková ◽  
Hana Šimonová ◽  
Dalibor Kocáb ◽  
Gabriela R. Fernandes
Keyword(s):  
Fracture Toughness ◽  
Pilot Study ◽  
Modulus Of Elasticity ◽  
Traditional Approach ◽  
Experimental Program ◽  
Freeze Thaw ◽  
Chevron Notch ◽  
Reference Set ◽  
Fracture Tests

The paper deals with a pilot study focused on the freeze-thaw (F-T) resistance of concrete. A non-traditional approach to the evaluation of the F-T resistance of concrete based on the determination of the fracture parameters is presented in the paper. Three types of specimens were used in the experimental program – prisms with edge and Chevron notch, and cylinders with the Chevron notch. Three sets of specimens of each shape were tested in total. The reference set was stored in the water until the time of testing. Another two sets of specimens were subjected to 50 and 100 freeze-thaw tests, respectively. One F-T cycle consisted of 4 hours freezing in the air at temperature -18 °C and 2 hours thawing in the water at temperature +20 °C. Based on the results, it can be stated that the values of fracture energy are proportional to the area of the ligament. This finding was observed for all tested sets – non-frost and frost attacked. The values of modulus of elasticity and fracture toughness are influenced more by the geometry and also by the changes of the specimens’ stiffness due to the exposition to the F-T cycles.

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