Bài viết Mô phỏng số PTHH xác định hằng số điện môi của vật liệu composite với cốt là vi cầu thủy tinh rỗng nền epoxy nghiên cứu xây dựng mô hình số PTHH để tính toán hằng số điện môi của vật liệu Composite có cốt liệu là vi cầu thủy tinh rỗng đặt trong nền epoxy (vật liệu bọt thủy tinh), khi tỉ lệ thể tích vi cầu thủy tinh biến đổi từ 0 tới 60%, độ dày thành thủy tinh và bán kính ngoài thay đổi. | Transport and Communications Science Journal Vol 73 Issue 9 12 2022 925-933 Transport and Communications Science Journal NUMMERICAL SIMULATIONS BY FINITE ELEMENT METHOD TO DETERMINATE THE DIELECTRIC CONSTANT OF HOLLOW-GLASS MICROSPHERE FILLED EPOXY-MATRIX COMPOSITES Nguyen Thi Huong Giang Vu Nguyen Thanh University of Transport and Communications No 3 Cau Giay Street Hanoi Vietnam ARTICLE INFO TYPE Research Article Received 10 08 2022 Revised 09 11 2022 Accepted 14 12 2022 Published online 15 12 2022 https Corresponding author Email nguyenthihuonggiang@ Tel 84 989784281 Abstract. Hollow-glass microsphere filled epoxy-matrix composite materials are of great interest to research in recent times because in addition to applications as marine buoyancy materials also used as low-density materials in paper studies numerical simulations by finite element method to determinate the dielectric constant of hollow-glass microsphere filled epoxy-matrix composites syntactic foams when the volume ratio of hollow-glass microsphere varies from 0 to 60 glass wall thickness and outer radius change. Numerical models built with periodic materials and defined by an elementary cell like that simple cubic body-centered cubic and face-centered cubic with the support of Cast3m open source software. On the elementary cell the periodic conditions for micro displacement field and micro electric potential field are satisfied. Then applied calculations to four types of hollow-glass microspheres are K1 K20 S38HS and S60HS manufactured in 3M China company. The numerical results are compared with the results of the Hashin-Strikman bounds with the analytical results and the experimental results of the previous studies to check the reliability. The results of this study add to the theory of calculation and prediction of effective dielectric constant of syntactic foams. Keywords dielectric constant hollow glass microsphere syntactic foam. 2022 .
