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- W1976772389 abstract "Abstract The elastic finite-element analysis of coal mine openings requires knowledge of the mechanical behavior of the coal, which is best supplied in the form of material stiffness matrices, or their inverse, the compliance matrices. The elastic properties of two different coal types are presented in the form of compliance matrices in this paper. Coal samples from two sources, one in the Pittsburgh seam of Pennsylvania, the other in the Herrin No. 6 seam of Illinois, were tested by two different laboratory methods to determine complete compliance matrices for three-dimensional stress states. The data are analyzed statistically, results obtained for the two coals by different test methods are compared, and possible idealizations for analysis are discussed. It appears that modeling of coal as an orthotropic material is a reasonable engineering approximation. Although the principal compliances are sufficiently similar to suggest isotropic behavior, the shear compliances are much larger than those obtained from the relations for an isotropic elastic material. Evidence is also presented which casts doubt on the applicability of the elastic model for other than monotonic load histories." @default.
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- W1976772389 date "1976-03-01" @default.
- W1976772389 modified "2023-10-18" @default.
- W1976772389 title "Elastic properties of two coals" @default.
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- W1976772389 doi "https://doi.org/10.1016/0148-9062(76)90424-1" @default.
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