Abstract
As a new addition to lightweight composite structures,the sandwich cylindrical shell with a metallic wire mesh core has emerged as a promising solution for thermodynamic perfor-mance analysis at elevated temperatures.The intricate interwoven cellular formations within the metallic wire mesh pose difficulties for thermo-mechanical modeling and property evaluation.First,the constitutive models employed to characterize hysteresis phenomena were presented,comprising isotropic elasticity,Bergstrom-Boyce model,Ogden hyper-elasticity,and parameter identification through mechanical examinations at varying temperatures.Second,the finite element modeling of cylindrical shell structures was determined for modal and steady-state dynamic analyses.Third,the experimental procedures were carried out,including the preparation of the sandwich cylindrical shell and the dynamic testing platform.The first-order natural frequency of the cylindrical shell structure is close to the resonance frequency of the dynamic test results,with a maximum error of 6.5％,demonstrating the accuracy of the simulation model.When compared to the solid-core cylindrical shell,the average insertion loss of the sandwich cylindrical shell structure within the fre-quency range of 10-1000 Hz at room temperature is up to 11.09 dB.Furthermore,at elevated tem-peratures,the average insertion loss of the sandwich cylindrical shell decreases but fluctuates as the temperature changes.
基金项目
National Natural Science Foundation of China(12272094)
Key Project of National Defence Innovation Zone of Science and Technology Commission of CMC,China(XXX-033-01)
Natural Science Foundation of Fujian Province of China(2022J01541)
NETL
NSTL
维普
万方数据