期刊
SYMMETRY-BASEL
卷 13, 期 11, 页码 -出版社
MDPI
DOI: 10.3390/sym13112225
关键词
equivalent homogenization method; sandwich cylinder; specified bending stiffness; specified bending strength; pure bending
资金
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX18_1088]
- National Natural Science Foundations of China [11772147]
- Natural Science Foundation of Jiangsu Province, China [BK20200706]
- Major University Science Research Project of Jiangsu Province, China [20KJA460001]
- National Major Scientific Research Instrument Development Program [12027901]
An equivalent theoretical homogenization method was proposed for composite sandwich cylinders subjected to pure bending, based on the homogeneous orthotropic layer hypothesis and Lekhnitskii's theory. The method developed is suitable for arbitrary combinations of winding layers with different winding angles and materials. Larger skin thickness and smaller winding angles were found to improve the specified bending stiffness and specified bending strength of the composite corrugated sandwich cylinders.
An equivalent theoretical homogenization method was proposed for composite sandwich cylinders subjected to pure bending. Firstly, based on a homogeneous orthotropic layer hypothesis, the trapezoidal corrugated sandwich core was found to be equivalent in a homogenization orthotropic layer with the nine equivalent mechanical properties. Then, Lekhnitskii's theory, based on a unified connection parameter method, was introduced and applied in the equivalent composite sandwich cylinder. The method developed by Lekhnitskii is suitable for arbitrary combinations of winding layers with different winding angles and materials. Additionally, the bending stiffness of the equivalent sandwich cylinder could be calculated. By developing user subroutine of UMAT, the numerical calculation results were in a good agreement with the results of the proposed method. Further, according to the Hill-Tsai strength criterion and the maximum strain criterion, parametric study was done for specified bending stiffness and specified bending strength. The results show that the influence of core parameters on the specified bending stiffness and strength are lower than that of the skin parameters. Additionally, larger skin thickness and smaller winding angles could improve the specified bending stiffness and specified bending strength of the composite corrugated sandwich cylinders.
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