ASTM E691-13由美國材料與試驗協會 US-ASTM 發布于 2013。
ASTM E691-13 在中國標準分類中歸屬于: N04 基礎標準與通用方法。
5.1 ASTM regulations require precision statements in all test methods in terms of repeatability and reproducibility. This practice may be used in obtaining the needed information as simply as possible. This information may then be used to prepare a precision statement in accordance with Practice E177.
5.2 Test Method and Protocol—In this practice, the term “test method” is used both for the actual measurement process and for the written description of the process, while the term “protocol” is used for the directions given to the laboratories for conducting the ILS.
5.3 Observations, Test Determinations and Test Results:
5.3.1 A test method often has three distinct stages, the direct observation of dimensions or properties, the arithmetic combination of the observed values to obtain a test determination, and the arithmetic combination of a number of test determinations to obtain the test result of the test method. In the simplest of test methods a single direct observation is both the test determination and the test result. For example, the test method may require the measurement of the mass of a test specimen prepared in a prescribed way. Another test method may require the measurement of the area of the test specimen as well as the mass, and then direct that the mass be divided by the area to obtain the mass per unit area of the specimen. The whole process of measuring the mass and the area and calculating the mass per unit area is a test determination. If the test method specifies that only one test determination is to be made, then the test determination value is the test result of the test method. Some test methods require that several determinations be made and the values obtained be averaged or otherwise combined to obtain the test result of the test method. Averaging of several determinations is often used to reduce the effect of local variations of the property within the material.
5.3.2 In this practice, the term “test determination” is used both for the process and for the value obtained by the process, except when “test determination value” is needed for clarity.
5.3.3 The number of test determinations required for a test result should be specified in each individual test method. The number of test results required for an interlaboratory study of a test method is specified in the protocol of that study.
5.4 Test Specimens and Test Units—In this practice a test unit is the total quantity of material needed for obtaining a test result as specified by the test method. The portion of the test unit needed for obtaining a single test determination is called a test specimen. Usually a separate test specimen is required for each test determination.
5.5 Precision, Bias, and Accuracy of a Test Method:
5.5.1 When a test method is applied to a large number of portions of a material, that are as nearly alike as possible, the test results obtained nevertheless will not all have the same value. A measure of the degree of agreement among these test results describes the precision of the test ......
ASTM D6484?聚合物基復合材料層壓板的開孔壓縮強度試驗測試目的??確定層壓板的極限壓縮強度OHC夾具?方法A: 楔形夾具夾緊OHC夾具做試驗??方法B:在剛性上下壓盤之間放置OHC夾具做試驗ASTM D6484 聚合物基復合材料層壓板開孔壓縮強度試驗3?ASTM-D7078 ?V型切口剪切測試為了減少試制次數，降低新產品開發的成本，計算機輔助工程（CAE）分析被廣泛應用。...
在2011年和2012年的ICCP會議上，制定了開展實驗室間精度研究的計劃，2012-2013年期間，進行了實驗室間工作，并通過ASTM審核程序審查了其統計結果，在2014年形成了ASTM D7708標準。本次研究的一套6塊巖石樣本(表1)是美國地質調查局(USGS)與ICCP協商后，從已經編制并鑒定的25塊候選巖石中挑選出來的（其他表征方法見表2）。...
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