Fractographic Investigations of Ordinary Ceramic Refractory Materials with Reduced Brittleness

2009 ◽  
Vol 409 ◽  
pp. 209-215 ◽  
Author(s):  
Harald Harmuth ◽  
Christian Manhart
Keyword(s):  
Correlation Length ◽  
Strain Energy ◽  
Crack Path ◽  
Elastic Strain Energy ◽  
Maximum Load ◽  
Refractory Materials ◽  
Group Of Seven ◽  
Large Size ◽  
Surface Profiles ◽  
Ceramic Refractory

A fractographic procedure was developed and applied for ordinary ceramic refractory materials with a rather large size of heterogeneities and defects. It is based on a stereooptical method for generation of digital surface profiles which are evaluated by an autocorrelation function. Furthermore, a lateral correlation length is derived. A group of seven refractory materials was characterised by mechanical and fracture mechanical investigations, and the same specimens had been characterized by the fractographic procedure. Correlations have been tested. The results show a relation between the lateral correlation length and two fracture mechanical characteristics which are significant for the material brittleness and the elastic strain energy stored at maximum load. These relations are contributed to the dependence of the crack path on brittleness. With decreasing brittleness the amount of the crack path proceeding along the grain/matrix boundary increases for the materials investigated.

Study of the thermal stability of ceramic refractory materials for prismatic samples

1972 ◽  
Vol 4 (7) ◽  
pp. 845-849
Author(s):  
V. L. Yurenas ◽  
V. I. Dauknis ◽  
K. A. Kazakyavichyus
Keyword(s):  
Thermal Stability ◽  
Refractory Materials ◽  
Thermal Stability Of ◽  
Ceramic Refractory

Scientific and practical approaches to creating ceramic refractory materials and technology

2011 ◽  
Vol 51 (5) ◽  
pp. 334-342 ◽  
Author(s):  
O. V. Roman ◽  
F. I. Panteleenko ◽  
O. P. Reut ◽  
V. T. Shmuradko ◽  
N. V. Kirshina ◽  
...  
Keyword(s):  
Refractory Materials ◽  
Ceramic Refractory

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.

ELABORATION PROCESS OF REFRACTORY MATERIALS BY REACTIVE PROJECTION OF OXIDE, PEROXIDE AND METALS

1986 ◽  
Vol 47 (C1) ◽  
pp. C1-159-C1-163
Author(s):  
M. PILATTI ◽  
J. CRANSVELD ◽  
G. RAYMOND ◽  
E. PLUMAT ◽  
P. H. DUVIGNEAUD
Keyword(s):  
Refractory Materials ◽  
Elaboration Process
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