PBX Wide temperature range deformation detection applying in-situ photogrammetry

Abstract Abnormal environment especially wide temperature range is an important cause of changes in the physical structure of PBX. And has a significant impact on its reliability and safety performance. In order to master the geometric deformation law of PBX in the wide temperature range, a “dual lens” in-situ photogrammetric method for PBX wide temperature range geometric deformation measurement with a “low expansion reference bar” as the measurement reference is proposed. The ultra-low expansion ceramic gauge block is used as the detection object for experimental research, and the feasibility and detection ability of this method for wide temperature range deformation measurement are verified. The experiment shows that the repeatability of point coordinate detection can reach 0.006mm, and the repeatability of different temperature conditions can reach 0.01mm. In situ monitoring was conducted on the corresponding points of PBX within the temperature range of −20 ℃ to 70 ℃. The data showed that deformation was related to the structure and positively correlated with the size of the structure. The size data before and after temperature cycling showed that it was suspected that after experiencing a low temperature environment of −20 ℃, the structural characteristic size increased irreversibly.