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ASTM B831-2019 pdf free download

ASTM B831-2019 pdf free download.Standard Test Method for Shear Testing of Thin Aluminum Alloy Products
1. Scope
1.1 This test method covers single shear testing of thin wrought and cast aluminum alloy products to determine shear ultimate strengths. It is intended for products that are too thin to be tested according to Test Method B769. 1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.3 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 appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.4 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
4. Summary of Test Method
4.1 This test method consists of subjecting a full thickness or machined rectangular test specimen to single shear force to failure in a test fixture using a tension testing machine. The shear strength is calculated from the maximum force required to fracture the specimen.
5. Significance and Use
5.1 The intent of this test method is to provide a means of measuring the ultimate shear strength of thin aluminum alloy wrought and cast products. It is recognized that the loading conditions developed by this test method, and by most others, are not ideal in that they do not strictly satisfy the definitions ofpure shear. However, rarely do pure shear conditions exist in structures. N OTE 1—Results from this test method are not interchangeable with results from Test Methods B565 and B769. Shear strengths obtained by this test method have been shown to differ from values determined with other methods. 3
6. Apparatus
6.1 Testing Machines—The testing machines shall conform to the requirements ofPractice E4. The maximum force used to determine the shear strength shall be within the verified force range of the testing machine as defined in Practice E4. 6.2 Loading Device: 6.2.1 The device for applying force to the specimen from the testing machine shall be a clevis of the type shown in Fig. 1 and shall be made of a hardened steel.
8. Specimen Orientation and Direction
8.1 The shear strength of wrought aluminum materials usually depends on the specimen orientation and the direction in which the load is applied relative to the grain flow in the specimen. 3 The specimen orientation and the loading direction should be identified by the following systems. 8.1.1 The reference directions for rectangular shapes are indicated in Fig. 3. These are suitable for sheet, plate, extrusions, forgings, and other shapes having nonsymmetrical grain flow. 8.2 The two-letter code is used in Fig. 3 to describe the specimen orientations and loading directions. The first letter designates the normal to the expected shear plane. The second letter designates the direction of force application or expected fracture direction. The most commonly used specimen orien- tations and loading directions are T-L and L-T for in-plane shear strength of thin products. This orientation code is identical to that used for cylindrical shear specimens in Test Method B769. N OTE 2—These orientation codes are analagous to those used for fracture specimens if the first letter is interpreted as the normal to the fracture plane and the second letter is the direction of fracture. N OTE 3—Typically, cast aluminum products do not exhibit the direc- tionality of wrought products; therefore, the orientation codes are not applicable to castings.

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