1.1 本试验方法包括在连续流动期间和静止储存后测量散装固体无侧限屈服强度的设备和程序。此外，还包括各种壁面上的内摩擦、体积密度和壁摩擦的测量。 1.2 本试验方法包括手动控制的Schulze环剪试验机的操作。该测试仪的自动版本也可用。其测试散装固体的方法原则上与本测试方法中描述的方法相似。 1.3 这些信息最常用于设计储料仓和料斗，以防止由于拱起和鼠洞而导致的流动停止，包括料斗壁的坡度和平滑度，以提供质量流量。此类设备的结构设计参数也可从该数据中得出。另一个应用是测量散装固体的流动性，例如，用于不同产品的比较或优化。 1.4 所有观测值和计算值应符合实践中确立的有效数字和舍入指南 D6026型 . 1.4.1 本标准中用于规定如何收集/记录或计算数据的程序被视为行业标准。此外，它们代表通常应保留的有效数字。使用的程序不考虑材料变化、获取数据的目的、特殊目的研究或用户目标的任何考虑因素:通常的做法是增加或减少报告数据的有效位数，以符合这些考虑因素。 考虑工程设计分析方法中使用的有效数字超出了本标准的范围。 1.5 单位- 以国际单位制表示的值应视为标准值。本标准不包括其他计量单位。 1.6 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.7 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 5.1 在几乎所有的工业设施中，来自料仓和料斗的可靠、受控的散装固体流至关重要。 不幸的是，由于拱起和鼠洞导致的流动停止很常见。其他问题包括粉末不受控制的流动（溢流）、颗粒混合物的分离、显著低于设计容量的可用容量、停滞区中散装固体的结块和变质以及结构故障。 5.2 通过测量散装固体的流动特性，并根据这些流动特性设计料仓和料斗，可以防止或消除大多数流动问题 ( 1. ) . 3. 5.3 对于颗粒显著百分比（通常为三分之一或更多）小于约6mm的散装固体( 1. / 4. 英寸），无侧限屈服强度由细骨料（−6mm粒级）决定。对于此类散装固体，只能对细颗粒进行强度和壁摩擦试验。 注1: 本标准产生的结果质量取决于执行人员的能力以及所用设备和设施的适用性。 符合实践标准的机构 第740页 通常认为能够胜任和客观的测试/取样/检验等。本标准的使用者应注意遵守规程 第740页 其本身不能确保可靠的结果。可靠的结果取决于许多因素；实践 第740页 提供了评估其中一些因素的方法。实践 第740页 是为从事土壤和岩石测试或检验（或两者兼有）的机构开发的。 因此，本标准并不完全适用于执行本标准的机构。然而，本标准的用户应认识到实践框架 第740页 适用于评估执行本标准的机构的质量。目前，没有已知的合格国家机构对执行本标准的机构进行检查。

1.1 This test method covers the apparatus and procedures for measuring the unconfined yield 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 test method covers operation of the manually-controlled Schulze Ring Shear Tester. An automated version of this tester is also available. Its method of testing bulk solids is similar in principle to that described in this test method. 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 may also be derived from this data. Another application is the measurement of the flowability of bulk solids, for example, for comparison of different products or optimization. 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 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, usable 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 ( 1 ) . 3 5.3 For bulk solids with a significant percentage of particles (typically, one third or more) finer than about 6 mm ( 1 / 4 in.), the unconfined yield strength is governed by the fines (−6 mm fraction). For such bulk solids, strength and wall friction tests may be performed on the fine fraction only. Note 1: The quality of the result produced by this standard is dependent on the competence of 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 standard are cautioned that compliance with Practice D3740 does not in itself ensure 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 or inspection (or both) of soil and rock. As such it is not totally applicable to agencies performing this standard. However, users of this standard should recognize that the framework of Practice D3740 is appropriate for evaluating the quality of an agency performing this standard. Currently there is no known qualifying national authority that inspects agencies that perform this standard.