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ASTM E837-2008e1 用钻孔应变仪法测定残余应力的标准试验方法

ASTM E837-2008e1 用钻孔应变仪法测定残余应力的标准试验方法

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【英文标准名称】: Standard Test Method for Determining Residual Stresses by the Hole-Drilling Strain-Gage Method
【原文标准名称】: 用钻孔应变仪法测定残余应力的标准试验方法
【标准号】: ASTM E837-2008e1
【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】: E28.13
【标准类型】: (Test Method)
【标准水平】: ()
【中文主题词】:
【英文主题词】: hole-drilling; integral method; residual stress measurement; strain gages; stress analysis; Hole-drilling strain-gage method; Mechanical analysis/testing; Radial strain; Residual stress; Strain gages; Stress cracking tests; Stress-strain testing; Surface
【摘要】: Summary: Residual stresses are present in almost all materials. They may be created during the manufacture or during the life of the material. If not recognized and accounted for in the design process, residual stresses can be a major factor in the failure of a material, particularly one subjected to alternating service loads or corrosive environments. Residual stress may also be beneficial, for example, the compressive stresses produced by shot peening. The hole-drilling strain-gage technique is a practical method for determining residual stresses.1.1 Residual Stress Determination: 1.1.1 This test method specifies a hole-drilling procedure for determining residual stress profiles near the surface of an isotropic linearly elastic material. The test method is applicable to residual stress profile determinations where in-plane stress gradients are small. The stresses may remain approximately constant with depth (x201C;uniformx201D; stresses) or they may vary significantly with depth (x201C;non-uniformx201D; stresses). The measured workpiece may be x201C;thinx201D; with thickness much less than the diameter of the drilled hole or x201C;thickx201D; with thickness much greater than the diameter of the drilled hole. Only uniform stress measurements are specified for thin workpieces, while both uniform and non-uniform stress measurements are specified for thick workpieces. 1.2 Stress Measurement Range: 1.2.1 The hole-drilling method can identify in-plane residual stresses near the measured surface of the workpiece material. The method gives localized measurements that indicate the residual stresses within the boundaries of the drilled hole. 1.2.2 This test method applies in cases where material behavior is linear-elastic. In theory, it is possible for local yielding to occur due to the stress concentration around the drilled hole, for isotropic (equi-biaxial) residual stresses exceeding 50 % of the yield stress, or for shear stresses in any direction exceeding 25 % of the yield stress. However, in practice it is found that satisfactory results can be achieved providing the residual stresses do not exceed about 60 % of the material yield stress. 1.3 Workpiece Damage: 1.3.1 The hole-drilling method is often described as x201C;semi-destructivex201D; because the damage that it causes is localized and often does not significantly affect the usefulness of the workpiece. In contrast, most other mechanical methods for measuring residual stresses substantially destroy the workpiece. Since hole drilling does cause some damage, this test method should be applied only in those cases either where the workpiece is expendable, or where the introduction of a small shallow hole will not significantly affect the usefulness of the workpiece. 1.4 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.
【中国标准分类号】: H22
【国际标准分类号】: 77_040_10
【页数】: 17P.;A4
【正文语种】: 英语

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