S27 Residual Stresses and Load Partitioning in Novel Metal/Ceramic Composites Exhibiting Lamellar Microstructures

2008 ◽  
Vol 23 (2) ◽  
pp. 185-185
Author(s):  
S. Roy ◽  
A. Wanner ◽  
J. Gibmeier
Keyword(s):  
Residual Stresses ◽  
Ceramic Composites ◽  
Metal Ceramic

Crack Growth in Metal-Ceramic Composites

2000 ◽  
Author(s):  
Parul Agrawal ◽  
C. T. Sun
Keyword(s):  
Residual Stresses ◽  
Crack Growth ◽  
Crack Path ◽  
Ceramic Composites ◽  
Fracture Mechanisms ◽  
Environmental Scanning ◽  
Metal Ceramic ◽  
Bend Tests ◽  
Point Bend

Abstract This research focuses on the fracture mechanisms in various metal-ceramic composites. The objective was to study the effects of volume fractions, residual stresses and other microstructural features like particle size and contiguity of the constituent phases, on fracture. Neutron diffraction tests were performed to measure residual stresses in these composites. In-situ 3-point bend tests were performed inside the ESEM (Environmental scanning electron microscope) chamber to observe crack growth. It was found that residual stresses and contiguity play dominant roles in fracture and defining the crack path. The correlations between residual stresses and other microstructural features with the crack path and failure mechanisms were established based on experimental observations.

scholarly journals Computational analysis of deformation and fracture in composite materials and coatings

2019 ◽  
Vol 221 ◽  
pp. 01017
Author(s):  
Ruslan Balokhonov ◽  
Rustam Bakeev ◽  
Varvara Romanova ◽  
Evgenia Emelianova ◽  
Maksim Sergeev ◽  
...  
Keyword(s):  
Residual Stresses ◽  
Computational Analysis ◽  
Three Dimensional ◽  
Constitutive Models ◽  
Ceramic Composites ◽  
Isotropic Hardening ◽  
Ceramic Particles ◽  
Deformation And Fracture ◽  
Metal Ceramic ◽  
Composite Microstructure

Deformation and fracture of metal-ceramic composites and coatings under quasistatic tension, compression, shear, and during cooling from the melt to room temperatures are numerically investigated. Dynamic and quasistatic boundary-value problems are solved in twoand three-dimensional formulations by the finite-difference and finite-element methods. Constitutive models include the isotropic hardening of aluminum and fracture of ceramic particles. Composite microstructure is taken into account explicitly. Analysis of the fracture in composites is carried out, with the residual stresses being not taken into consideration. Origination of cracks in the near-interface regions of bulk tension and their propagation in ceramic particles are investigated. Residual stresses formed during cooling of the composites are calculated for different volume fractions of particles.

Residual stresses in novel metal/ceramic composites exhibiting a lamellar microstructure

2009 ◽  
Vol 24 (S1) ◽  
pp. S59-S64 ◽  
Author(s):  
Siddhartha Roy ◽  
Jens Gibmeier ◽  
Alexander Wanner
Keyword(s):  
Residual Stresses ◽  
Porous Ceramic ◽  
Lamellar Microstructure ◽  
Cost Effective ◽  
High Energy ◽  
Ceramic Composites ◽  
Aluminum Silicon Alloy ◽  
Spatially Resolved ◽  
Production Route ◽  
Metal Ceramic

The aim of this study is to analyze the mechanics of a new class of metal/ceramic composites on a mesoscopic length scale. These composites are produced by melt infiltration of porous ceramic preforms produced by freeze casting and subsequent sintering. This production route has a high application potential since it offers a cost-effective way to obtain composites with ceramic content in the 30 to 70 vol.%range. The as-produced material exhibits a hierarchical domain structure with each domain composed of alternating layers of metallic and ceramic lamellae. Residual stresses present in all phases of the composite produced by infiltrating alumina preforms with a eutectic aluminum-silicon alloy have been measured. Integral as well as spatially resolved measurements were carried out on single-domain samples at the high-energy, energy-dispersive diffraction (EDDI) beamline at the synchrotron radiation source BESSY (Berlin, Germany). Results show that strongly fluctuating residual stresses are introduced by the production process, which can be rationalized by taking into account the thermal expansion mismatch of alloy and preform.

Micro-CT Finite Element Analysis of Thermal Residual Stresses and Fracture in Metal-Ceramic Composites

2016 ◽  
Vol 19 (8) ◽  
pp. 1600725 ◽  
Author(s):  
Michał Basista ◽  
Witold Węglewski ◽  
Kamil Bochenek ◽  
Zuzanna Poniżnik ◽  
Zdzisław Nowak
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Residual Stresses ◽  
Ceramic Composites ◽  
Micro Ct ◽  
Element Analysis ◽  
Thermal Residual Stresses ◽  
Metal Ceramic

scholarly journals Tough metal-ceramic composites with multifunctional nacre-like architecture

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Erik Poloni ◽  
Florian Bouville ◽  
Christopher H. Dreimol ◽  
Tobias P. Niebel ◽  
Thomas Weber ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Sol Gel ◽  
Ceramic Composites ◽  
High Fracture Toughness ◽  
Processing Route ◽  
High Fracture ◽  
Metal Ceramic ◽  
Attractive Option ◽  
Brick And Mortar ◽  
Robotic Applications

AbstractThe brick-and-mortar architecture of biological nacre has inspired the development of synthetic composites with enhanced fracture toughness and multiple functionalities. While the use of metals as the “mortar” phase is an attractive option to maximize fracture toughness of bulk composites, non-mechanical functionalities potentially enabled by the presence of a metal in the structure remain relatively limited and unexplored. Using iron as the mortar phase, we develop and investigate nacre-like composites with high fracture toughness and stiffness combined with unique magnetic, electrical and thermal functionalities. Such metal-ceramic composites are prepared through the sol–gel deposition of iron-based coatings on alumina platelets and the magnetically-driven assembly of the pre-coated platelets into nacre-like architectures, followed by pressure-assisted densification at 1450 °C. With the help of state-of-the-art characterization techniques, we show that this processing route leads to lightweight inorganic structures that display outstanding fracture resistance, show noticeable magnetization and are amenable to fast induction heating. Materials with this set of properties might find use in transport, aerospace and robotic applications that require weight minimization combined with magnetic, electrical or thermal functionalities.

Processing and Elastic Property Characterization of Porous SiC Preform for Interpenetrating Metal/Ceramic Composites

2012 ◽  
Vol 95 (10) ◽  
pp. 3078-3083 ◽  
Author(s):  
Siddhartha Roy ◽  
Karl Günter Schell ◽  
Ethel Claudia Bucharsky ◽  
Pascal Hettich ◽  
Stefan Dietrich ◽  
...  
Keyword(s):  
Elastic Property ◽  
Ceramic Composites ◽  
Metal Ceramic ◽  
Porous Sic ◽  
Property Characterization

Influence of the Interface and Residual Stresses on the Apparent Fracture Toughness of Layered Ceramic Composites Based on Alumina-Zirconia

2014 ◽  
Vol 606 ◽  
pp. 209-212
Author(s):  
Luboš Náhlík ◽  
Bohuslav Máša ◽  
Pavel Hutař
Keyword(s):  
Residual Stresses ◽  
Crack Propagation ◽  
Ceramic Composites ◽  
Layered Composites ◽  
Material Interfaces ◽  
Linear Elastic ◽  
Apparent Fracture Toughness ◽  
Elastic Fracture ◽  
Layered Ceramic ◽  
Good Agreement

This paper deals with the fracture behaviour of layered ceramic composite with residual stresses. The main goal is to investigate the effect of residual stresses and material interfaces on crack propagation by more complex 3D finite element models. The crack behaviour was described by analytical procedures based on linear elastic fracture mechanics (LEFM) and generalized LEFM. The influence of laminate composition with residual stresses on critical values for crack propagation through the laminate interfaces was also determined. Good agreement has been found to exist between numerical results and experimental data. The results obtained can be used for a design of new layered composites with improved resistance against crack propagation.

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