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ASTM E855-2008 涉及静负载的弹簧用金属板材弯曲试验的标准试验方法

ASTM E855-2008 涉及静负载的弹簧用金属板材弯曲试验的标准试验方法

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【英文标准名称】: Standard Test Methods for Bend Testing of Metallic Flat Materials for Spring Applications Involving Static Loading
【原文标准名称】: 涉及静负载的弹簧用金属板材弯曲试验的标准试验方法
【标准号】: ASTM E855-2008
【标准状态】: 现行
【国别】: 美国
【发布日期】: 2008
【实施或试行日期】:
【发布单位】: 美国材料与试验协会(US-ASTM)
【起草单位】: E28.02
【标准类型】: (Test Method)
【标准水平】: ()
【中文主题词】:
【英文主题词】: Bend testing--metallic materials; Cantilever testing; Four-point loaded beam method; Loading tests--metals/alloys; Mass moment of inertia; Mechanical analysis/testing; Metallic sheet materials; Metal springs; Modulus of elasticity; Oscillating pendulum me
【摘要】: Measurements of bending strength and modulus of elasticity in bending should be made for materials whose principal stressing mode is bending. For many materials, the tensile and compressive moduli are somewhat different. Since the bending modulus is a combination of the tensile and compressive moduli, it is often different from each of them. Precise measurements of the modulus of elasticity in bending and bending strength require due regard for numerous variables that may affect their determination. These include (1) characteristics such as specimen orientation with respect to the rolling direction, grain size, residual stresses, previous strain history, dimensions and specimen preparation, orientation of deformed grains relative to the direction of the normal stress; and (2) test conditions, such as tem- perature, temperature variations, condition of the test equipment and adherence to the recommended test procedure.1.1 This standard describes three test methods for determining the modulus of elasticity in bending and the bending strength of metallic strips or sheets intended for the use in flat springs: 1.1.1 Test Method A8212;a cantilever beam, 1.1.2 Test Method B8212;a three-point loaded beam (that is, a beam resting on two supports and centrally loaded), and 1.1.3 Test Method C8212;a four-point loaded beam (that is, a beam resting on two supports and loaded at two points equally spaced from each support). 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 appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 6.1 This test method covers the determination of the modulus of elasticity in bending and the offset yield strength in bending of flat metallic strips or sheets for spring applications. The test procedure involves measurements of the applied moment and the corresponding angle of deflection of a cantilever beam. The thickness range covered is 0.015 to 0.130 in. (0.38 to 3.30 mm). This test method is not applicable for nonlinear elastic materials. 15.1 These test methods cover the determination of the modulus of elasticity in bending and the bending proof strength of flat metallic strips or sheets for spring applications. The test methods consist of deflection tests of a simple beam configuration subjected to either three- or four-point symmetrical loading. The thickness range covered is 0.010 to 0.050 in. (0.25 to 1.3 mm). Note 38212;Thickness ranges outside of those specified may be agreed upon between suppliers and users.
【中国标准分类号】: H22
【国际标准分类号】: 21_16
【页数】: 9P.;A4
【正文语种】: 英语

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