Size Effects of Honeycomb Matrix Materials and Their Impact on Numerical Prediction Accuracy
HUANG Rong1,2,3, MU Rangke1,2,3,*, BAI Chunyu1,2,3, XI Xulong1,2,3, ZHANG Xinyue1,2,3, LIU Xiaochuan1,2,3
1 National Key Laboratory of Strength and Structural Integrity, Xi’an 710065, China 2 Key Laboratory of Aviation Science and Technology on Structures Impact Dynamics, Aircraft Strength Research Institute of China, Xi’an 710065, China 3 Shaanxi Province Key Laboratory of Aircraft Vibration, Impact and Noise, Xi’an 710065, China
Abstract: To investigate the influence of size effects on the mechanical properties of honeycomb matrix materials, aluminum honeycomb matrix materials of varying thicknesses were prepared and subjected to dynamic mechanical testing. Based on the test results, the Johnson-Cook (J-C) principal model parameters of the matrix material were calibrated. Subsequently, dynamic compression simulations of the honeycomb structure were conducted using LS-Dyna to examine how variations in the principal parameters, induced by the size effect of the matrix material, impact the accuracy of compression performance predictions for the honeycomb structure. The results indicate that as the specimen thickness decreases, the failure strain of the matrix material decreases while its strength increases, and the failure mode transitions from shear fracture to horizontal fracture. Additionally, the failure strain of the matrix material increases with higher strain rates. By accounting for the variation in constitutive model parameters due to the size effect of the honeycomb matrix material, the numerical prediction error for the compression performance of the honeycomb structure was significantly reduced from 31.44% to 3.78%.
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2025, Vol. 39 
