Volume 43 Issue 6
Jun.  2023
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SHI Shengbo, WANG Renzhi, TANG Jiabin, GAN Yundan, YUAN Jianfei, CHEN Yong. Failure mechanism and dynamic response of a composite lattice structure under intense explosion loadings[J]. Explosion And Shock Waves, 2023, 43(6): 062201. doi: 10.11883/bzycj-2022-0430
Citation: SHI Shengbo, WANG Renzhi, TANG Jiabin, GAN Yundan, YUAN Jianfei, CHEN Yong. Failure mechanism and dynamic response of a composite lattice structure under intense explosion loadings[J]. Explosion And Shock Waves, 2023, 43(6): 062201. doi: 10.11883/bzycj-2022-0430

Failure mechanism and dynamic response of a composite lattice structure under intense explosion loadings

doi: 10.11883/bzycj-2022-0430
  • Received Date: 2022-10-07
  • Rev Recd Date: 2023-04-10
  • Available Online: 2023-04-26
  • Publish Date: 2023-06-05
  • In order to comply with the requirements of explosive shock wave protection for the new generation of equipment structures, it is necessary to design a lightweight, high energy absorption ratio structure and further systematically understand its dynamic responses under explosion loadings. A composite lattice sandwich structure with pyramidal truss core was designed, which consisting of carbon fiber reinforced composite panels and metal cores. The explosion experiments were carried out. The failure mechanism and damage mode of this composite lattice structure under intense explosion shock loadings were analyzed. Based on the failure mechanism in mesoscale of the material, both the three-dimensional progressive damage model of the composite panels and the Johnson-Cook damage model of the metal cores were constructed. By combining with the finite element method, a numerical model for predicting explosion shock response of the composite lattice structure was developed. Both the bonding properties between layers of the composite panels, and the performances of the adhesive layer between the panels and the cores were considered in the numerical model. The initial damage criterion based on strain description was established, and the damage dynamic evolution equations corresponding to different damage modes were given. A damage variable was introduced to characterize the attenuation degree of stiffness properties of the damaged elements. Furthermore, the stress of damaged elements could be obtained. The dynamic responses of this structure under different loadings were analyzed using the developed model. The main mechanisms influencing the explosion protection properties of the composite lattice structure were discussed based on both simulated and experimental results. It is revealed that the local failures occur when the composite lattice structure is exposed and close to explosion loadings. The main failure modes are the debonding between the composite panels and the pyramidal truss cores in the edge area, and the fracture of local struts. However, the overall configuration of this composite lattice sandwich structure is basically intact and it still has a good carrying capacities. The damage function considering various variables of load conditions and structural parameters was discussed. The feasible domain for this structure design was given. These research results can provide theoretical basis and technical support for the designing and safety evaluation of lightweight, explosion protection structure of key equipment components.
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