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Energy-based and local approaches to the strength analysis of ceramic laminates with thermal residual stresses through the finite element method. (English) Zbl 1258.74204

Summary: This paper deals with the strength analysis of ceramic laminates subjected to residual stress fields. In particular, alumina/mullite/zirconia ceramic materials have been taken into consideration. To this purpose, an energy-based approach and a micromechanical local approach have been used within the framework of the finite element method.
The results obtained through the numerical analyses are consistent with the experimental ones, providing a correct estimation of the limit strength; furthermore, a lower bound on the external applied loads, below which no crack propagation occurs, can be identified.
The local approach has led to a strength distribution that deviates from the typical Weibull distribution; this is owed to the residual stress field. Indeed, a stress-dependent Weibull modulus has been found.

MSC:

74S05 Finite element methods applied to problems in solid mechanics
74E30 Composite and mixture properties
74F05 Thermal effects in solid mechanics
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