In this paper, the current bolt axial stress measurement is investigated and summarized. Bolt transducer method is chosen to take experiments and test. The strain bolt axial stress transducer and optical fiber axial stress transducer are both developed and researched in this paper, which the craft process and experiments are explored and carried out. The testing data is obtained and transducer characteristics are calculated and analyzed.
In this paper, a large-scale composite thin-walled stiffened structure is subjected to an axial compression stability test. The stability of the structure is tested and analyzed using resistance strain gauges, digital speckle correlation and finite element methods. The analysis results were analyzed from four aspects: instability load, load strain result, load displacement result and test calculation result comparison. In this paper, the initial buckling load, load-strain bifurcation curve, buckling wave distribution characteristics of the composite thin-walled stiffened curved plate under two radius parameters, the comparison of the test deformation results and the calculation analysis results, etc. are obtained for research. The research on the stability of large-scale composite thin-walled reinforced structures provides new ideas and methods.
In order to reveal the failure mechanism of the weld structure of the new generation launch vehicle in ultralow temperature environment and to provide scientific basis for improving the welding quality and the carrying capacity of the tank, in this project, this paper studied full-field mechanical parameters inversion and failure mechanism of non uniform joints at ultralow temperature environment. Firstly, the test method of ultralow temperature mechanical properties of aluminum alloy welded specimens based on DIC is described, and an open system for simulating the ultralow temperature environment was established. Secondly, two specimens based on the welding and friction stir welding were studied. In this paper, the relationship between load and stress strain curve, strain distribution along the direction of the load and the strain concentration factor of the welded specimen were analyzed. Results show that the friction stir welding specimen was better than the fusion welding specimen in mechanical properties. Finally, this paper also compared the influence of test area effect on, and it show that the measurement error was not more than 8.8% when heat affected zone size was between 2~8mm. The three tensile specimens were all broken in the gauge length and the fracture location was consistent. There was obvious plastic deformation near the fracture. The microstructure was observed. The tensile specimens were all broken in the gauge length and the fracture location was consistent. There was obvious plastic deformation near the fracture. The microscopic morphology observation showed that the whole section showed shear dimple morphology, and no material defects were observed. The fracture mode of the tensile fracture is plastic fracture.This project would provide a scientific basis for the welding process optimization and improvement of the ultra temperature tank of the new generation launch vehicle in China.
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