TY - JOUR
T1 - Evaluation of fracture toughness and proposal of microstructurally-controlled composites by fracture-mechanics simulation
AU - Toda, Hiroyuki
AU - Kobayashi, Toshiro
AU - Wada, Yoshiharu
AU - Inoue, Naoya
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 1995
Y1 - 1995
N2 - Recently we have constructed a simulation program based on the fracture mechanics for crack initiation and growth in discontinuously-reinforced MMCs. Parametric studies are carried out to evaluate the effects of reinforcement properties, such as volume fraction, tensile strength, interfacial bonding stress and spatial pattern of distribution, on crack initiation and growth characteristics through SiC whisker-reinforced 6061Al alloy composites. The crack initiation toughness decreases and simultaneously the crack growth resistance increases with increasing volume fraction. Degradation of both interfacial bonding stress and fiber strength affect mostly the crack initiation toughness. On the other hand, spatial patterns of whisker distribution have a certain influence on crack growth resistance, and there exists an optimum extent of whisker clustering for the crack growth resistance. Based on the results of the simulation, MMC with artificial and periodic clustering of whiskers has been proposed. It has been fabricated actually by high pressure infiltration casting using preforms made from granulated whiskers, and its mechanical properties and fracture characteristics are evaluated. It is certain that the crack growth resistance of the MMC is improved without spoiling other mechanical properties by introducing clustering.
AB - Recently we have constructed a simulation program based on the fracture mechanics for crack initiation and growth in discontinuously-reinforced MMCs. Parametric studies are carried out to evaluate the effects of reinforcement properties, such as volume fraction, tensile strength, interfacial bonding stress and spatial pattern of distribution, on crack initiation and growth characteristics through SiC whisker-reinforced 6061Al alloy composites. The crack initiation toughness decreases and simultaneously the crack growth resistance increases with increasing volume fraction. Degradation of both interfacial bonding stress and fiber strength affect mostly the crack initiation toughness. On the other hand, spatial patterns of whisker distribution have a certain influence on crack growth resistance, and there exists an optimum extent of whisker clustering for the crack growth resistance. Based on the results of the simulation, MMC with artificial and periodic clustering of whiskers has been proposed. It has been fabricated actually by high pressure infiltration casting using preforms made from granulated whiskers, and its mechanical properties and fracture characteristics are evaluated. It is certain that the crack growth resistance of the MMC is improved without spoiling other mechanical properties by introducing clustering.
UR - http://www.scopus.com/inward/record.url?scp=0029252192&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0029252192&partnerID=8YFLogxK
U2 - 10.2320/jinstmet1952.59.2_198
DO - 10.2320/jinstmet1952.59.2_198
M3 - Article
AN - SCOPUS:0029252192
VL - 59
SP - 198
EP - 205
JO - Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
JF - Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
SN - 0021-4876
IS - 2
ER -