用于中子衍射的原位应力加载装置

一种小型化的应力加载系统，配合中子衍射应力谱仪可实现对多晶材料的原位测量，为进一步获得材料内部相、织构与应力演化的原位中子衍射实验结果，建立基于微观机制的材料宏观本构模型提供可能。该系统利用伺服电机提供动力，机架使用7050铝合金材料制造，系统的拉伸强度可达10 kN，运动速度可调(1 μm/s~1 mm/s)。试样拉伸(压缩)时，S型传感器内部应变片变形产生电压信号，再经PLC处理后得到试样应力与应变之间关系。通过与英斯特朗5967实验拉伸机针对同一钢质试样进行对比实验发现，应力-应变曲线一致性良好。

Abstract

A self-developed miniaturized stress loading system equipped with residual stress neutron diffractometer can actualize in situ measurement of polycrystalline material. It makes possible further acquirement about phase, texture and stress evolution within material and the building of a material macro constitutive model based on micromechanism. This system utilizes servo motor to provide motive power, and chooses 7050 aluminum alloy material to fabricate mechanical structure, whose tensile strength can reach up to 10 kN and the move speed can be adjusted between 1 μm/s and 1 mm/s. The S-type sensor used in the system will be deformed when it receives force and exports voltage signals, which will be dealt with by PLC program, and then the relationship between sample stress and strain can be obtained. The results obtained by 10 kN in-situ stretcher were in close agreement with the stress-strain profiles obtained by Instron 5967 stretcher on the same type steel samples.

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张莹, 庞蓓蓓, 席治国, 李建. 用于中子衍射的原位应力加载装置[J]. 强激光与粒子束, 2013, 25(11): 2865. Zhang Ying, Pang Beibei, Xi Zhiguo, Li Jian. Design of a in-situ stress loading system used for residual stress neutron diffractometer[J]. High Power Laser and Particle Beams, 2013, 25(11): 2865.

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