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Li, Baolong; Xu, Yan; Dong, Yi; Chen, Jietong; Xu, Zheng

doi:10.1023/a:1015795722065

Cited by 9 publications

(3 citation statements)

References 8 publications

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“…For a polycrystalline material with strong elastic anisotropy, the damage assessment of MSWs is inevitably connected with evaluating the effect of local microstructures on the MSWs. Predicting mesoscopic stress responses of constituent grains of polycrystalline materials is often a ubiquitous demand in assessment of material damage, [1][2][3][4][5][6], and small crack behavior, [7][8]. By means of computer simulation, one usually constructs a polycrystalline aggregate, which contains a fairly large number of constituent grains to mimic microstructure of polycrystalline materials, [6,[9][10], whereby the mesoscopic stress can be computed at the material scale of grain size.…”

Section: Introductionmentioning

confidence: 99%

Computational assessment of material structure weaknesses in polycrystalline materials

2004

Archive of Applied Mechanics

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By incorporating local grain orientation, grain geometry and macroscopic elastic properties, a numerical procedure has been developed for computational prediction of mesoscopic stress and strain distributions in simulated polycrystalline material samples. The numerical procedure is developed on the basis of the concept of grain-average fields, Kröner-Kneer model, Waldvogel-Rodin algorithm and a self-adaptive method. Repeated computer tests were performed to investigate mesoscopic stress variation in the samples, and find coherent interrelations of material structure weaknesses (MSWs) with local microstructure of the samples. It was found that the stronger the single crystal elastic anisotropy, the stronger the inhomogeneity of mesoscopic stress distribution. Not only the elastic anisotropy, but also the grain geometry, may produce significant local stress disturbances. It has been found that the defined 'orientation-geometry factor' and 'correlation parameter' are two adequate physical quantities which account for synergetic interactions due to grain-orientation geometry-induced anisotropy. By using the two quantities, MSWs can be well correlated with local microstructure. Computer tests also show that 250-400 conjoining grains are necessary to homogenize the mesoscopic stress distribution in the considered materials.

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Section: Introductionmentioning

confidence: 99%

Computational assessment of material structure weaknesses in polycrystalline materials

2004

Archive of Applied Mechanics

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“…Compared with 1,10-phenanthroline or 2,2 0 -bipyridine [15,16], the complexes of 4,5-diazafluoren-9-one (afo) have been rarely reported in the literature [17][18][19][20]. We are pursuing the syntheses of new complexes using nitrilotriacetate (nta) and a variety of shapes of organic co-ligand [14,[21][22][23] [24] or bpe [25]. X-ray analysis [26] shows that 1 is constructed of [Cu(Hnta)(afo)] entities (Fig.…”

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confidence: 99%

“…The trinuclear copper complexes possesses crystallographically imposed inversion symmetry with the center at the Cu2 atom. The Cu2 atom has a distorted octahedron coordination, with four O atoms from four water molecules and two N atoms from two bpe ligands, (azpy)] Á 6H 2 O[22]. However, the Cu(1) atom has a trigonal bipyramidal geometry.…”

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confidence: 99%