Incremental damage theory of particulate-reinforced composites with a ductile interphase

2011 ◽  
Vol 93 (10) ◽  
pp. 2655-2662 ◽  
Author(s):  
Hui Yang ◽  
Puhui Chen ◽  
Yunpeng Jiang ◽  
Keiichiro Tohgo
Keyword(s):  
Reinforced Composites ◽  
Damage Theory ◽  
Particulate Reinforced Composites ◽  
Ductile Interphase ◽  
Particulate Reinforced

A Progressive Damage Mechanics in Particle-Reinforced Metal-Matrix Composites Under High Triaxial Tension

1994 ◽  
Vol 116 (3) ◽  
pp. 414-420 ◽  
Author(s):  
Keiichiro Tohgo ◽  
G. J. Weng
Keyword(s):  
Porous Material ◽  
Equivalent Stress ◽  
Energy Approach ◽  
Plastic Behavior ◽  
Strain Response ◽  
Reinforced Composites ◽  
Stress Strain ◽  
Damage Theory ◽  
Particulate Reinforced Composites ◽  
Particulate Reinforced

The energy approach recently proposed by Qiu and Weng (1992) is introduced to estimate the equivalent stress of the ductile matrix in Tohgo and Chou’s (1991) incremental damage theory for particulate-reinforced composites containing hard particles. In such a composite debonding of the particle-matrix interface is a significant damage process, as the damaged particles have a weakening effect while the intact particles have a reinforcing effect. In Tohgo-Chou’s theory, which describes the elastic-plastic behavior and the damage behavior of particulate-reinforced composites, it was assumed that the debonding damage is controlled by the stress of the particle and the statistical behavior of the particle-matrix interfacial strength, and that the debonded (damaged) particles are regarded as voids, resulting in an increased void concentration with deformation. On the other hand, Qiu-Weng’s energy approach provides a reasonable equivalent stress of the matrix in the porous material and particulate-reinforced composite even under a high triaxiality. The incremental damage theory developed here enables one to calculate the overall stress-strain response and damage evolution of the composite under high triaxial tension. The stress-strain relations for porous material obtained by the present incremental theory are completely consistent with that obtained by Qiu and Weng. The influence of the debonding damage on the stress-strain response is demonstrated for particulate-reinforced composites.

scholarly journals Analysis of Crack-Tip Field of Particulate-Reinforced Composites Taking Account of Particle Size Effect and Debonding Damage

2010 ◽  
Vol 452-453 ◽  
pp. 625-628
Author(s):  
Tomoyuki Fujii ◽  
Keiichiro Tohgo ◽  
Yu Itoh ◽  
Daisuke Kato ◽  
Yoshinobu Shimamura
Keyword(s):  
Particle Size ◽  
Size Effect ◽  
Crack Tip ◽  
Energy Criterion ◽  
Particle Size Effect ◽  
Reinforced Composites ◽  
Crack Tip Field ◽  
Damage Area ◽  
Particulate Reinforced Composites ◽  
Particulate Reinforced

This paper deals with an analysis of a crack-tip field of particulate-reinforced composites which can describe the evolution of debonding damage, matrix plasticity and particle size effect on deformation and damage. Numerical analyses were carried out on a crack-tip field in elastic-plastic matrix composites reinforced with elastic particles by using a finite element method developed based on an incremental damage theory. The particle size effect on damage is described by a critical energy criterion for particle-matrix interfacial debonding. The effect of debonding damage on a crack-tip field is discussed based on numerical results. The debonding damage initiates and progresses ahead of a crack-tip. The stress distribution shifts downward in the debonding damage area. It is concluded that a crack-tip field is strongly affected by debonding damage.

Fluidity Evolution of an Al-10%B4C Metal Matrix Composite

2007 ◽  
Vol 546-549 ◽  
pp. 605-610 ◽  
Author(s):  
Zhan Zhang ◽  
X. Grant Chen ◽  
André Charette
Keyword(s):  
Metal Matrix ◽  
Advanced Materials ◽  
Matrix Composites ◽  
Reinforced Composites ◽  
Reaction Products ◽  
Superior Mechanical Properties ◽  
Electron Microscopes ◽  
Particulate Reinforced Composites ◽  
Particulate Reinforced ◽  
Fluidity Test

Aluminum boron carbide particulate reinforced composites are advanced materials which have superior mechanical properties, and especially have the capability to capture neutrons. The liquid mixing process is one of the methods to produce economically and effectively the metal matrix composites. However, it was found that the fluidity of the composites was instable during liquid holding and casting. To examine the fluidity evolution over the time, the melt of an Al-10%B4C composite was hold at a constant temperature for a long period, and the fluidity was evaluated by means of a vacuum fluidity test. The microstructure of the fluidity test samples was examined by optical and electron microscopes. It is found that the interfacial reaction products between B4C and Al-matrix play an important role for the deterioration of the composite fluidity.

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