کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1450136 988723 2006 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Residual stresses, strength and toughness of laminates with different layer thickness ratios
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Residual stresses, strength and toughness of laminates with different layer thickness ratios
چکیده انگلیسی

The effect of residual stresses on the strength, toughness and work of fracture of Al2O3–5 wt.% tZrO2/Al2O3–30 wt.% mZrO2 layered ceramics with different thickness ratios has been investigated. The laminates, as well as a monolithic Al2O3–5 wt.% tZrO2 used as reference material, were fabricated by sequential slip casting. Residual stresses were estimated experimentally using indentation techniques and analytically using a three-dimensional finite element model. Flexural strength was evaluated by means of four-point bending tests on specimens with natural and artificial (indentation) flaws. Experimental findings show the existence of a threshold strength in the laminates whose value depends on the layer thickness ratio. Crack growth resistance behaviour was studied by crack opening displacement-controlled tests and by recourse to a weight function analytical approach. The high compressive stresses in the internal layers yield a pronounced R-curve behaviour in the laminates. Regarding work of fracture, it is found to be enhanced to levels up to about six times that of the reference monolith. The results are discussed in terms of the optimum layered architectural design for structural applications on the basis of the compromise between threshold strength and energy absorption capability associated with crack bifurcation mechanisms occurring at fracture.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 54, Issue 18, October 2006, Pages 4745–4757
نویسندگان
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