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Nx Borehole Jack Modulus Determinations in Homogeneous, Isotropic, Elastic Materials.

Authors
Meyer-TO; McVey-JR
Source
NTIS: PB 233 493 :50 pages
Link
NIOSHTIC No.
10000818
Abstract
Laboratory test results are presented for the determination of elastic modulus made with the nx borehole jack. Determinations were made in massive pieces of aluminum so as to satisfy conditions of linear elasticity, homogeneity, and isotropy. Results indicate a large discrepancy (approximately 200 percent) between material modulus as determined by laboratory block-loading tests and that indicated by the jack under relatively ideal circumstances. Effects due to interface friction, finite block size, incomplete plate-bore contact, and other factors were examined and found not to be significant. Finite element results indicate that assumed loading conditions for the jack differ from those actually occurring, at least in materials of high elastic modulus (approximately 10 million psi), such as quartzite.
Publication Date
19740101
Document Type
IH; Report of Investigations
Fiscal Year
1974
NTIS Accession No.
PB-233493
NTIS Price
A04
Identifying No.
RI 7855
NIOSH Division
SRC;
Source Name
NTIS: PB 233 493
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