Abstract:The mechanical behavior, with particular emphasis on the damage mechanisms, of SiCp/Al composites was studied by both experiments and finite element analysis in this paper. A 3D microstructure-based finite element model was developed to predict the elasto-plastic response and fracture behavior of a 7vol.% SiCp/Al composite. The 3D microstructure of SiCp/Al composite was reconstructed by implementing a Camisizer XT particle size analysis device and a random sequential adsorption algorithm. The constitutive beha… Show more
“…This early-stage particle fracture phenomenon would be harmful for the strength as well as for the elongation of a composite. 32 The early fracture behavior of large particles agrees with the experimental observation that coarser particle fractures more prevalently. 33,34 Figure 3.Tensile stress–strain curves of SiCp/Al composites with circle particles of diameters 1, 2, 5, 10 and 20 µm embedded in the unit cell.…”
Section: Resultssupporting
confidence: 80%
“…This model can be applied to predict the effects of particle size and shape on the deformation and failure behaviors in particle-reinforced MMCs. Comparing with other composite models, 10–13,32 this model includes comprehensive deformation and fracture characteristics of the matrix alloy and the particle. McWilliams et al.…”
Section: Resultsmentioning
confidence: 99%
“…10–12 3D SiCp/Al models created by Zhang et al. 32 cannot interpret the effect of the particle size on the failure process of MMCs because the size-dependent strength of the SiC particles was not incorporated into the models.…”
A microstructure-based comprehensive finite element model, which incorporated the deformation/fracture of the matrix alloy, fracture of the particle and decohesion of interface, was built to predict the effects of particle size and shape on the plastic deformation and fracture behaviors in particle-reinforced metal matrix composites. The effect of particle size on the yield strength and work hardening rate of the matrix alloy was demonstrated. When the particle diameter is <10 µm, the fracture of the matrix alloy near the interface dominates the failure mechanism of the composite, whereas changed to particle fracture with particle diameter >10 µm. A cohesive zone model was also included in order to predict interfacial failure behavior. It was noted that SiC/Al interface exhibits a high interfacial bonding strength and the interfacial decohesion was caused by crack propagation from the particle to the interface. The simulation results are in good agreement with the experiment tensile test results in the SiCp/6061Al composite.
“…This early-stage particle fracture phenomenon would be harmful for the strength as well as for the elongation of a composite. 32 The early fracture behavior of large particles agrees with the experimental observation that coarser particle fractures more prevalently. 33,34 Figure 3.Tensile stress–strain curves of SiCp/Al composites with circle particles of diameters 1, 2, 5, 10 and 20 µm embedded in the unit cell.…”
Section: Resultssupporting
confidence: 80%
“…This model can be applied to predict the effects of particle size and shape on the deformation and failure behaviors in particle-reinforced MMCs. Comparing with other composite models, 10–13,32 this model includes comprehensive deformation and fracture characteristics of the matrix alloy and the particle. McWilliams et al.…”
Section: Resultsmentioning
confidence: 99%
“…10–12 3D SiCp/Al models created by Zhang et al. 32 cannot interpret the effect of the particle size on the failure process of MMCs because the size-dependent strength of the SiC particles was not incorporated into the models.…”
A microstructure-based comprehensive finite element model, which incorporated the deformation/fracture of the matrix alloy, fracture of the particle and decohesion of interface, was built to predict the effects of particle size and shape on the plastic deformation and fracture behaviors in particle-reinforced metal matrix composites. The effect of particle size on the yield strength and work hardening rate of the matrix alloy was demonstrated. When the particle diameter is <10 µm, the fracture of the matrix alloy near the interface dominates the failure mechanism of the composite, whereas changed to particle fracture with particle diameter >10 µm. A cohesive zone model was also included in order to predict interfacial failure behavior. It was noted that SiC/Al interface exhibits a high interfacial bonding strength and the interfacial decohesion was caused by crack propagation from the particle to the interface. The simulation results are in good agreement with the experiment tensile test results in the SiCp/6061Al composite.
“…Using these models it was carefully examined and clarified in a large body of works how multiple microstructural characteristics, e.g. particle shape [3,4], size [5,6], distribution [7,8] individually and jointly influence global material properties ranging from coefficient of thermal expansion [9] to the rate of crack propagation [10]. Among global material behaviors investigated, the load bearing capacity of PRMMCs occupies a central place.…”
Predicting the material strengths of particulate reinforced metal matrix composites (PRMMCs) and understanding how these properties are related to the constituents and microstructural features are essential for material designers and application engineers. To this end, a computational approach consists of the direct methods, homogenization, and statistical analyses is introduced in our previous studies [1,2]. Since in various engineering applications failure of PRMMC materials are caused by time-varied combinations of tensile and shear stresses, to take into account of such situations the established approach is extended in the present work. In this paper, ultimate strengths and endurance limits of an exemplary PRMMC material, WC-Co, are predicted under three independently varied tensile and shear stresses. In order to cover the entire load space with least amount of weight factors, a new method for generating optimally distributed weight factors in an n dimensional space is formulated. Employing weight factors determined by this algorithm, direct method calculations were performed on many statistically equivalent representative volume elements (SERVE) samples, and through analyzing statistical characteristics associated with results the study suggests a simplified approach to estimate the material strength under superposed stresses without solving the difficult high dimensional shakedown problem.
“…The abovementioned analyses were performed in a two‐dimensional framework. Some efforts have been taken to conduct three‐dimensional crack propagation analysis in particulate composites,() but the computational cost associated with such simulations limits the scope of such studies in terms of number of particles that can be analysed. Further, the computational intensity prevents the possibility of conducting a series of parametric analysis to explore the effect of microstructural features and the influence of constituent properties.…”
A computational fracture analysis is conducted on a self‐healing particulate composite employing a finite element model of an actual microstructure. The key objective is to quantify the effects of the actual morphology and the fracture properties of the healing particles on the overall mechanical behaviour of the (MoSi2) particle‐dispersed Yttria Stabilised Zirconia (YSZ) composite. To simulate fracture, a cohesive zone approach is utilised whereby cohesive elements are embedded throughout the finite element mesh allowing for arbitrary crack initiation and propagation in the microstructure. The fracture behaviour in terms of the composite strength and the percentage of fractured particles is reported as a function of the mismatch in fracture properties between the healing particles and the matrix as well as a function of particle/matrix interface strength and fracture energy. The study can be used as a guiding tool for designing an extrinsic self‐healing material and understanding the effect of the healing particles on the overall mechanical properties of the material.
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