Design of a in-situ stress loading system used for residual stress neutron diffractometer

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 m/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.