GB/T 26140-2010 in English

《GB/T 26140-2010无损检测 测量残余应力的中子衍射方法》由TC56（全国无损检测标准化技术委员会）归口，主管部门为国家标准化管理委员会。

Scope

WARNING: This standard does not address any safety issues; if any, it is relevant to its application. Applicable codes of safety and health practice are established by the users of this standard; and are to be observed in the use of this standard. This standard specifies the method for measuring the residual stress of polycrystalline materials by neutron diffraction. This standard is applicable to the detection of homogeneous and heterogeneous materials and bulk samples containing different crystal phases. This standard briefly introduces the principle of neutron diffraction technology, gives suggestions on the corresponding diffraction crystal planes used when measuring different types of materials, and provides guidance on how to choose the measurement direction and the volume to be measured related to the grain size and stress state of the measured material. guide. This standard describes the process of accurately locating and correcting the detection site within the neutron beam in order to be able to accurately define the sampling volume of the sample material at the time of measurement. This standard describes the problems that need to be paid attention to when calibrating neutron diffraction devices, and introduces the technical methods for obtaining stress-free reference values. This standard describes in detail the method of measuring various elastic strains by neutron diffraction, clarifies the process of analyzing the results and determining the statistical correlation, how to obtain reliable residual (or applied) stress from the strain data, and how to evaluate the inconsistency of the results. Certainty makes recommendations.