Paper Title:
Fracture of Thin Walled Translucent Polycrystalline Alumina (PCA) Tubes
  Abstract

Room temperature fracture behavior of short thin walled translucent coarse-grained polycrystalline alumina (PCA) tubes was investigated under compression loading in radial direction using conventional mechanical tests combined with the finite element modelling (FEM). FEM indicated strongly inhomogeneous stress distribution with the maximum tangential tensile stresses in the centre of the inner surface of a tube and opposite to the line of loading. Another zone of tangential tensile stresses form on the outer surface of the tube and oriented perpendicularly to the loading direction. However, these tensile stresses are lower compared to those under contact lines. Radial stresses were negligible compared to tangential stresses which were concluded to control tube fracture. Fracture occurs in two steps: firstly along the loading lines under the lines of contacts and secondly in the direction perpendicular to loading. It results in four regular pieces along the lines with the highest tangential tensile stresses. The results were analysed using Weibull statistics and standard fractography methods. The characteristic strength of the PCA tubes was 186 MPa and the Weibull parameter m‘corr = 16.9 ± 0.5. High m values and the absence of the obvious fracture origins were attributed to homogeneous microstructure and well developed PCA technology.

  Info
Periodical
Edited by
J. Dusza, R. Danzer, R. Morrell and G.D. Quinn
Pages
223-230
DOI
10.4028/www.scientific.net/KEM.409.223
Citation
F. Lofaj, V. Ivančo, P. P. Varga, "Fracture of Thin Walled Translucent Polycrystalline Alumina (PCA) Tubes", Key Engineering Materials, Vol. 409, pp. 223-230, 2009
Online since
March 2009
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: J. Weerheijm
Abstract:The rate effect on concrete tensile strength can be modeled by the description of crack extension in a fictitious fracture plane [1,2].The...
991
Authors: Dong Woo Lee, Seok Swoo Cho, Won Sik Joo
Abstract:A roller mill is composed of several rollers, rotational table liners, hydraulic cylinders and raw materials are ground between the rollers...
457
Authors: Min Chul Kim, Jae Bong Lee, Yong Jun Oh, Bong Sang Lee
Abstract:The critical fracture stresses (σ* f(sp)) in various low alloy steels for a reactor pressure vessel(RPV) were evaluated by a small punch...
416
Authors: M. Ziaee, Naghdali Choupani
Abstract:The present research examines analytically and experimentally the mode-I and mode-II and mixed mode-Interlaminar fracture toughness of PAN...
880
Authors: Jian Ping Lu
Chapter 3: Iron and Steel
Abstract:The ultra-microduplex structure was fabricated in the high carbon steel with a fully pearlitic structure after severe plastic deformation....
875