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在拉伸和压缩轴向力作用下验证试验框架和样品准直精度的标准实施规程  
 【英文标准名称】  Standard Practice for Verification of Test Frame and Specimen Alignment Under Tensile and Compressive Axial Force Application
 【原文标准名称】  在拉伸和压缩轴向力作用下验证试验框架和样品准直精度的标准实施规程
 【标准号】  ASTM E1012-2005
 【标准状态】  Active
 【国别】  
 【发布日期】  2005
 【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】  E28.04
 【标准类型】  (Practice)
 【标准水平】  ()
 【中文主题词】  机械试验;工艺;抗拉荷载;试样;试验;抗拉试验;准直
 【英文主题词】  
 【摘要】  

It has been shown that bending stresses that inadvertently occur due to misalignment between the applied force and the specimen axes during the application of tensile and compressive forces can affect the test results. In recognition of this effect, some test methods include a statement limiting the misalignment that is permitted. The purpose of this practice is to provide a reference for test methods and practices that require the application of tensile or compressive forces under conditions where alignment is important. The objective is to implement the use of common terminology and methods for verification of alignment of test machines, associated fixtures and test specimens.

Unless otherwise specified, axiality requirements and verifications should be optional when testing is performed for acceptance of materials for minimum strength and ductility requirements. This is because any effects especially from excessive bending, would be expected to reduce strength and ductility properties and give conservative results. There may be no benefit from improved axiality when testing high ductility materials to determine conformance with minimum properties. Whether or not to improve axiality should be a matter of negotiation between the material producer and the user.

1.1 Included in this practice are methods covering the determination of the amount of bending that occurs during the application of tensile and compressive forces to notched and unnotched test specimens in the elastic range and to plastic strains less than 0.002. These methods are particularly applicable to the force application rates normally used for tension testing, creep testing, and uniaxial fatigue testing.

 【中国标准分类号】  A52
 【国际标准分类号】  19_060
 【页数】  11P.;A4
 【正文语种】  
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