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ASTM D6128-14
Standard Test Method for Shear Testing of Bulk Solids Using the Jenike Shear Cell
Automaticky přeložený název:
Standardní zkušební metoda pro testování ve smyku sypkých materiálů s použitím Jenike smyku Cell
NORMA vydána dne 1.9.2014
Informace o normě:
Označení normy: ASTM D6128-14
Poznámka: NEPLATNÁ
Datum vydání normy: 1.9.2014
Kód zboží: NS-33918
Počet stran: 20
Přibližná hmotnost: 60 g (0.13 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Kategorie - podobné normy:
Anotace textu normy ASTM D6128-14 :
Keywords:
bulk solid, cohesive strength, effective angle of friction, effective yield locus, flow function, internal friction angle, Jenike shear cell, kinematic wall friction angle, powder, translational shear tester, unconfined yield strength, wall friction, ICS Number Code 19.060 (Mechanical testing)
Doplňující informace
| Significance and Use | ||||||||||
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5.1 Reliable, controlled flow of bulk solids from bins and hoppers is essential in almost every industrial facility. Unfortunately, flow stoppages due to arching and ratholing are common. Additional problems include uncontrolled flow (flooding) of powders, segregation of particle mixtures, useable capacity which is significantly less than design capacity, caking and spoilage of bulk solids in stagnant zones, and structural failures. 5.2 By measuring the flow properties of bulk solids, and designing bins and hoppers based on these flow properties, most flow problems can be prevented or eliminated. 5.3 For bulk solids with a significant percentage of particles (typically, one third or more) finer than about 6 mm, the cohesive strength is governed by the fines (-6-mm fraction). For such bulk solids, cohesive strength and wall friction tests may be performed on the fine fraction only. Note 1: The quality of the result produced by this test method
is dependent on the competence of the personnel performing it, and
the suitability of the equipment and facilities used. Agencies that
meet the criteria of Practice D3740 are generally considered capable of
competent and objective testing/sampling/inspection/etc. Users of
this test method are cautioned that compliance with Practice
D3740 does not in itself
assure reliable results. Reliable results depend on many factors;
Practice D3740 provides a
means of evaluating some of those factors. Practice D3740 was developed for agencies engaged
in the testing and/or inspection of soil and rock. As such it is
not totally applicable to agencies performing this test method.
However, users of this test method should recognize that the
framework of Practice D3740
is appropriate for evaluating the quality of an agency performing
this test method. Currently there is no known qualifying national
authority that inspects agencies that perform this test
method.
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| 1. Scope | ||||||||||
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1.1 This method 2covers the apparatus and procedures for measuring the cohesive strength of bulk solids during both continuous flow and after storage at rest. In addition, measurements of internal friction, bulk density, and wall friction on various wall surfaces are included. 1.2 This standard is not applicable to testing bulk solids that do not reach the steady state requirement within the travel limit of the shear cell. It is difficult to classify ahead of time which bulk solids cannot be tested, but one example may be those consisting of highly elastic particles. 1.3 The most common use of this information is in the design of storage bins and hoppers to prevent flow stoppages due to arching and ratholing, including the slope and smoothness of hopper walls to provide mass flow. Parameters for structural design of such equipment also may be derived from this data. 1.4 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026. 1.4.1 The procedures used to specify how data are collected/recorded or calculated, in this standard are regarded as the industry standard. In addition, they are representative of the significant digits that generally should be retained. The procedures used do not consider material variation, purpose for obtaining the data, special purpose studies, or any considerations for the user's objectives; and it is common practice to increase or reduce significant digits of reported data to be commensurate with these considerations. It is beyond the scope of this standard to consider significant digits used in analysis methods for engineering design. 1.5 Units—The values stated in SI units are to be regarded as standard. No other units of measure are included in this standard 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. |
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| 2. Referenced Documents | ||||||||||
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