1.1 本试验方法涵盖了一种仪器和程序，用于确定粉末和其他散装固体的体积密度范围，作为压缩应力的函数。 1.2 本试验方法应在受控温度和湿度条件下的实验室中进行。 1.3 所有观察值和计算值应符合实践中确定的有效数字和舍入准则 D6026 . 1.3.1 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，它们代表了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，通常做法是增加或减少报告数据的有效数字，以与这些考虑因素相称。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。 1.4 单位- 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.5 本标准并非旨在解决与其使用相关的所有安全问题（如有）。 本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.6 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《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 该测试的数据可用于估计料仓和料斗中材料的体积密度，并用于物料处理应用，如给料机。 5.2 选择用于测试的样本会对测试结果产生很大影响。为了获得有意义的结果，有必要根据水分（水）含量、粒度分布和温度选择颗粒固体的代表性样品。对于试验，应提供适当尺寸的样品，每个试样应使用新鲜材料。 5.3 初始体积密度（ρ b ) 最初的 ，可以用作也可以不用作最小体积密度。这将取决于测试的材料。例如，对于粗颗粒（大多数颗粒大于约6 mm）、游离颗粒，这两者通常接近相同- 流动的散装固体，但不适用于细的可充气粉末。 5.4 体积密度值可能取决于所施加质量增量的大小。传统上，每增加一倍，施加的质量增加一倍，导致施加的质量增加比为1。对于对应用的质量增量比高度敏感的材料，可能需要小于标准增量比。后者的一个例子是，材料的体积密度随着应用质量的增加而增加10%或更多。 5.5 体积密度值可能取决于每个施加质量的持续时间。传统上，每次增量的持续时间相同，等于15秒。 对于某些材料，压缩速率使得完全压缩（在给定施加的压缩应力下体积随时间无变化）需要明显超过15秒。 注1: 本标准产生的结果的质量取决于执行该标准的人员的能力，以及所用设备和设施的适用性。符合实践标准的机构 D3740 通常认为能够胜任和客观的测试/采样/检查等。本标准的用户应注意遵守惯例 D3740 本身并不能保证可靠的结果。 可靠的结果取决于许多因素；实践 D3740 提供了一种评估其中一些因素的方法。实践 D3740 是为从事土壤和岩石测试或检查（或两者）的机构开发的。因此，它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 D3740 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来检查执行本标准的机构。

1.1 This test method covers an apparatus and procedure for determining a range of bulk densities of powders and other bulk solids as a function of compressive stress. 1.2 This test method should be performed in the laboratory under controlled conditions of temperature and humidity. 1.3 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026 . 1.3.1 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. 1.4 Units— The values stated in SI units are to be regarded as standard. No other units of measure are included in this standard. 1.5 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. 1.6 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 The data from this test can be used to estimate the bulk density of materials in bins and hoppers and for material handling applications such as feeders. 5.2 The test results can be greatly affected by the sample selected for testing. For meaningful results it is necessary to select a representative sample of the particulate solid with respect to moisture (water) content, particle-size distribution and temperature. For the tests an appropriate size sample should be available, and fresh material should be used for each individual test specimen. 5.3 Initial bulk density, (ρ b ) initial , may or may not be used as the minimum bulk density. This will depend on the material being tested. For example, the two are often close to the same for coarse (most particles larger than about 6 mm), free-flowing bulk solids, but not for fine, aeratable powders. 5.4 Bulk density values may be dependent upon the magnitude of the applied mass increments. Traditionally, the applied mass is doubled for each increment resulting in an applied mass increment ratio of 1. Smaller than standard increment ratios may be desirable for materials that are highly sensitive to the applied mass increment ratio. An example of the latter is a material whose bulk density increases 10% or more with each increase in applied mass. 5.5 Bulk density values may be dependent upon the duration of each applied mass. Traditionally, the duration is the same for each increment and equal to 15 s. For some materials, the rate of compression is such that complete compression (no change in volume with time at a given applied compressive stress) will require significantly more than 15 s. 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 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 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.