| Citation: | CHEN Jingyang, LI Baiyang. Strength evaluation method of flange connection bolt structure under impact load[J]. Journal of Aerospace Power, 2025, 40（5）：20230560 doi: 10.13224/j.cnki.jasp.20230560
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A research on the strength evaluation method of flange connection bolt structure under impact load was conducted. The dynamic mechanical performance material test specimens were processed, the dynamic mechanical behavior of bolt materials was obtained through tests. The dynamic tensile test showed that the material IN718 for bolts had a significant strain rate strengthening effect. Under medium to high strain rate conditions, the yield strength and tensile strength of the material were both improved. The fracture mechanics model calibration test specimens were processed. The fracture mechanics tests of materials under different stress states showed that the fracture strain of bolt materials was related to the stress spatial state of the materials. And the bolt material fracture mechanics model considering stress triaxiality and Lode’s angle was established through tests. The strength evaluation method for bolts under impact load was established based on the above material tests and finite element method. The comparison between the impact test results and the evaluation analysis results showed that under the given impact load conditions, the evaluation results of the comprehensive consideration of the dynamic mechanical properties and fracture mechanical properties of bolt materials were consistent with the test results; under
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