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Gravity Flow of Powder in a Lunar Environment (In Two Parts). 2. Analysis of Flow Initiation.

Authors
Pariseau-WG
Source
NTIS: PB 205 504 :20 pages
Link
NIOSHTIC No.
10008813
Abstract
A small displacement-small strain finite element technique utilizing the constant strain triangle and incremental constitutive equations for elastic-plastic media, which are nonhardening and obey a coulomb yield condition, has been applied to the analysis of gravity flow initiation in a v-shaped hopper containing a powder under lunar environmental conditions. Three methods of loading were examined. Of the three, the method of computing the initial state of stress in a filled hopper prior to drawdown by adding material to the hopper layer-by-layer is superior. Results of the analysis of a typical hopper problem show that the initial state of stress, the elastic moduli, and the strength parameters have an important influence on material response subsequent to the opening of the hopper outlet.
Publication Date
19710101
Document Type
IH; Report of Investigation;
Fiscal Year
1971
NTIS Accession No.
PB-205504
NTIS Price
A03
Identifying No.
RI 7577
Source Name
NTIS: PB 205 504
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