scholarly journals Wedge-Splitting Test on Carbon-Containing Refractories at High Temperatures

2019 ◽  
Vol 9 (16) ◽  
pp. 3249 ◽  
Author(s):  
Stückelschweiger ◽  
Gruber ◽  
Jin ◽  
Harmuth
Keyword(s):  
Tensile Strength ◽  
Fracture Energy ◽  
Laser Speckle ◽  
Displacement Measurement ◽  
Ambient Atmosphere ◽  
Specific Fracture Energy ◽  
Wedge Splitting Test ◽  
Splitting Test ◽  
Specific Fracture ◽  
Wedge Splitting

The mode I fracture behavior of ordinary refractory materials is usually tested with the wedge-splitting test. At elevated temperatures, the optical displacement measurement is difficult because of the convection in the furnace and possible reactions of refractory components with the ambient atmosphere. The present paper introduces a newly developed testing device, which is able to perform such experiments up to 1500 °C. For the testing of carbon-containing refractories a gas purging, for example, with argon, is possible. Laser speckle extensometers are applied for the displacement measurement. A carbon-containing magnesia refractory (MgO–C) was selected for a case study. Based on the results obtained from tests, fracture mechanical parameters such as the specific fracture energy and the nominal notch tensile strength were calculated. An inverse simulation procedure applying the finite element method yields tensile strength, the total specific fracture energy, and the strain-softening behavior. Additionally, the creep behavior was also considered for the evaluation.

Fracture Behaviour of Modified Spruce Wood: A Study Using Linear and Non Linear Fracture Mechanics

Holzforschung ◽  
2002 ◽  
Vol 56 (2) ◽  
pp. 191-198 ◽  
Author(s):  
Alexander Reiterer ◽  
Gerhard Sinn
Keyword(s):  
Fracture Energy ◽  
Heat Treatments ◽  
Critical Stress Intensity Factor ◽  
Mode I ◽  
Mode Iii ◽  
Fracture Properties ◽  
Specific Fracture Energy ◽  
Wedge Splitting Test ◽  
Splitting Test ◽  
Specific Fracture

Summary The fracture properties of unmodified and modified (heat treatments under various conditions and acetylation) sprucewood are investigated using the wedge splitting test. Fracture parameters measured include critical stress intensity factor and specific fracture energy under Mode I loading and specific fracture energy under Mode III loading. The Mode I fracture properties are reduced by all kinds of modification. However, acetylation leads to a reduction of only 20%whereas heat treatments reduce the properties to a much greater extent, approximately 50%to 80%. The Mode III fracture properties are influenced less. SEM pictures of the fracture surfaces support the described findings.

Simulation of Refractory Fracture as a Tool for Advanced Material Testing

2014 ◽  
Vol 92 ◽  
pp. 232-241
Author(s):  
Dietmar Gruber ◽  
Sheng Li Jin ◽  
Harald Harmuth
Keyword(s):  
Tensile Strength ◽  
Fracture Energy ◽  
Test Method ◽  
Evaluation Procedure ◽  
Crack Model ◽  
Refractory Materials ◽  
Specific Fracture Energy ◽  
Splitting Test ◽  
Specific Fracture ◽  
Ceramic Refractory

The work presented here deals with simulation assisted evaluation of fracture testing of ordinary ceramic refractory materials. Two tests are applied. One of them, a wedge splitting test, is already established for this purpose. An inverse evaluation procedure was developed to derive more information from the test results: It enables the simultaneous determination of the specific fracture energy, the tensile strength and the Young’s modulus. Moreover specific fracture energy can also be determined in the case that the test has to be interrupted at some residual load due to relatively low material brittleness. The other test method, a laser irradiation disc test, was developed in order to determine specific fracture energy and tensile strength for fine ceramic refractory materials behaving relatively brittle. From the time elapsed until crack initiation occurs (t1) and a stable/instable transition of crack propagation takes place (t2), respectively, the tensile strength and the specific fracture energy are calculated based on a simulation of the mode I fracture behavior which applies the fictitious crack model according to Hillerborg.

Wedge Splitting Test and Fracture Energy on Particulate Reinforced Composites

2016 ◽  
Vol 40 (3) ◽  
pp. 253-258 ◽  
Author(s):  
Seong Hyeon Na ◽  
Jae Hoon Kim ◽  
Hoon Seok Choi ◽  
Jae Beom Park ◽  
Shin Hoe Kim ◽  
...  
Keyword(s):  
Fracture Energy ◽  
Reinforced Composites ◽  
Wedge Splitting Test ◽  
Splitting Test ◽  
Particulate Reinforced Composites ◽  
Particulate Reinforced ◽  
Wedge Splitting

scholarly journals Fracture characterisation of yew (Taxus baccata L.) and spruce (Picea abies [L.] Karst.) in the radial-tangential and tangential-radial crack propagation system by a micro wedge splitting test

Holzforschung ◽  
2007 ◽  
Vol 61 (5) ◽  
pp. 582-588 ◽  
Author(s):  
Daniel Keunecke ◽  
Stefanie Stanzl-Tschegg ◽  
Peter Niemz
Keyword(s):  
Picea Abies ◽  
Crack Opening ◽  
Transverse Load ◽  
Initial Slope ◽  
Taxus Baccata ◽  
Tangential Plane ◽  
Wedge Splitting Test ◽  
Splitting Test ◽  
Specific Fracture ◽  
Wedge Splitting

Abstract Common yew (Taxus baccata L.) and Norway spruce (Picea abies [L.] Karst.) are gymnosperm species that differ in their microscopic structure and mechanical characteristics. Compared to spruce, the density of yew wood is high, but the modulus of elasticity is low when loaded parallel to the grain. Information about the transverse load direction is largely lacking. Therefore, the goal of this study was to assess the elastic and fracture mechanical behaviour of both wood species in the radial-tangential plane (crack opening mode I). For this purpose, micro wedge splitting tests were performed. Characteristic elastic and fracture parameters (initial slope, critical load, specific fracture energy) were determined. After the tests, the fracture surfaces were evaluated using microscopic methods. The results reveal clear differences between the species regarding microscopic fracture phenomena and prove that yew wood was significantly stiffer than spruce wood. We suggest that the density and the cell geometry are predominantly responsible for both elasticity and failure behaviour in the transverse direction.

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