Abstract
Based on the bolted flange connection structure between stages of the missiles, four experimental specimens are simplified and manufactured, and the transverse impact failure experiments of the drop hammer are designed and carried out in this study. During the experiments, a new signal sensor is designed to collect the data of the bolts force, and the response data such as the bolts force, the slotted displacement of the connecting interface, and the impact force are collected in the loading process. The sequential failure mechanism of the structure under transverse impact load is analyzed and demonstrated according to the experimental results and the measured data. Additionally, a finite element model to simulate the failure process of the connection structure has been established, and the precision of the model has been verified and validated according to the experimental results. Moreover, the comparison between the results of the experiments and the simulation shows that the precision of this model is reliable in the engineering.
Highlights
In the current work, the impact failure experiments of the bolted flange connection structure were designed and carried out, and the results of sequential failure have been realized
In order to verify the numerical simulation accuracy, the corresponding finite element model is established according to Section 2.3. e response data of bolts force are the key data for reflecting the Strain (10–3) Strain (10–3)
With the bolt force response curve of simulation model T-1 as an example, the response amplitude of the single bolt in the bolt group is around kN, the bolt response amplitude measured in the experiment is about kN, and the error between them is about 5%. e response time range of the initial load bearing bolt is about 3 ms, the actual measurement is about 3.5 ms, and the error is about 16.67%
Summary
E failure experiments of drop hammer were designed using the experimental specimens previously mentioned to fully reveal the failure mechanism of the bolted flange connection structure under impact load and to provide data support for numerical simulation. Different structural parameters such as the number of bolts, bolts distribution conditions, and the bolt diameter were considered and designed for comparison and analysis. The flange, bolts, bolt nuts, and cushion blocks are meshed using the hexahedral element with the reduced integral algorithm, and the column segment is meshed using the quadrilateral shell element with the reduced integral algorithm to improve the Figure 5: e signal acquisition sensor of the bolts force. It is determined that the experiments are loaded from the height of 2 m with the drop hammer of 270 kg limited by the existing experimental conditions in the laboratory. e two groups of fastening bolts of 12 × M8 and 12 × M10 set up on the fixed boundary, respectively, were adopted to guarantee the complete clamping effect of the tooling boundary
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
