| Co-Investigator(Kenkyū-buntansha) |
UCHIYAMA Toyomi Saitama University, Mechanical, Associate, 工学部, 助手 (20151904)
ARAI Yoshio Saitama University, Mechanical, Assoc. Professor, 工学部, 助教授 (70175959)
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| Research Abstract |
As an advanced structural materials for airplane and space-rocket, fiber reinforced Metals (FRM or MMC) are developed and used practically. In the present research, we investigate the micromechanics of inclusion theoretically and experimentally in order to clarify the strength characteristics of MMC.
Results are summarized as :
1.We analyzed rigorously the steady state thermal stress problem for an elastic thick plate containing an oblate spheroidal inhomogeneity with the circle regions of both plate surfaces being heated and cooled, and for an infinite solid containing spheroidal inclusion and a screw dislocation with the use of elasticity, and made clear the effect of size of inclusion and shape ratio and ratio of rigidity on the distributions of displacements and stresses.
2.We showed the method of solution how to solve the problem for an elastic semi -infinite plate containing an elliptic hole under transverse bending by thin plate theory, and made clear the moment factor, stress inte
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nsity factor.
3.We tried to solve the problem for an infinite solid having a spheroidal inclusion and an annular crack. under uniform tension, we succeeded to solve the problem of an infinite body having an annular crack under tension rigorously. We showed the stress intensity factors and the crack opening displacements.
4.As the thermal stress problem of MMC, we considered the thick plate containing an oblate spheroidal inclusion which subject to eigenstrain with a uniform gradient, and made clear the effect of size of inclusion and shape ratio and ratio of rigidity on the distributions of displacements and stresses. Furthermore, we analyzed problem of the semi-infinite plate having an elliptic inclusion at which boundary sliding with friction is assumed, by using isoparametric BEM. And we made clear stress concentration around the elliptic inclusion.
5.We investigated the effect of thermal cycling on fracture mechanism in SiCp reinforced aluminium cast alloyl (MMC) material, also studied the effect of thermal cycling on ductility at elevated temperature for SiCp reinforced aluminium cast alloy. And we made fractographic evaluation of static fracture mechanism for SiCp particle reinforced aluminium cast alloy. Less
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