Traon , Nicolas
; Alves Pereira , Antonio Henrique
; Otani, L.B.
; de Anchieta Rodrigues, J.
; Tonnesen, Thorsten
; Telle, Rainer
The Influence of Nonlinear Elasticity on the Accuracy of Thermal Shock Damage Evaluation by the Impulse Excitation
Refractories Manual (2011) 98-102
This work quantifies the influence of nonlinear elasticity on the accuracy of the thermal shock damage evaluation of highalumina
refractory castables based on dynamic Young’s modulus and damping characterization data obtained via the impulse
excitation technique (IET).The nonlinear elasticity leads to shifts in the Young’s modulus and damping values in dependence of
the impulse intensity.
An IET apparatus was employed according to the ASTM E1876-07 standard; the method was improved by nonlinear analysis
based on the excitation control. Two arbitrary coefficients were defined to evaluate the nonlinearity with respect to the impulse
intensity. Three high-alumina refractory castables were submitted to progressive thermal shock damage and evaluated.
The results show that the influence of nonlinear elasticity on the Young’s modulus is significant and that nonlinear elasticity
is a determining factor for the accuracy of the damping characterization (up to -0.93 % and +114 %, respectively, depending
on the damage level).
Click page-thumbnail to open full text (pdf):