Static Tensile Properties and Engineering Estimation Model of Porous Laminates Under Hygrothermal Environment

被引：0

作者：

Jia B. ^{[1
]}

Ren P. ^{[2
]}

Song T. ^{[2
]}

Lu X. ^{[1
]}

Xiong Y. ^{[2
]}

Yang X. ^{[2
]}

机构：

[1] College of Transportation Science and Engineering, Civil Aviation University of China, Tianjin

[2] College of Aeronautical Engineering, Civil Aviation University of China, Tianjin

来源：

Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | 2024年 / 40卷 / 02期

关键词：

composite; engineering estimation model; hygrothermal environment; laminates; mechanical properties;

D O I：

10.16865/j.cnki.1000-7555.2024.0019

中图分类号：

O24 [计算数学];

学科分类号：

070102 ;

摘要：

The prediction of mechanical properties of composite structural parts in hygrothermal environment is of great significance for its engineering applications. Focusing on the prediction of static tensile properties and strength of composite laminates in hygrothermal environments, the static tensile test of porous laminates of composite materials was carried out, and the failure response and damage characterization of six different types of structures in hygrothermal environments were analyzed. Based on the stress field strength method, the engineering estimation model of porous laminates in hygrothermal environment was established, and the influence of hygrothermal environment on the mechanical properties and tensile failure of porous laminates was analyzed by comparing the finite element progressive damage model and test results. The results show that the error range between the prediction results of the engineering estimation model, finite element and test results is small, which can be used to predict the influence of temperature and hygroscopic rate on the tensile failure strength of porous laminates. Compared with the dry state at room temperature, the tensile failure strength of the specimen is decreased by 6.1% in the hygroscopic saturation state at 75 ℃. In the dry state of 25 ℃ and 75 ℃ hygroscopic saturation, the fiber tensile failure of 0° padding of porous laminate is the most serious, the tensile failure of the matrix of 90° ply is the most serious, and the main failure modes of laminate are matrix tensile failure and fiber tensile failure. The microscopic morphology of the thickness of the laminate in the hygroscopic saturation state at 75 ℃ was analyzed by scanning electron microscopy, and it is found that the debonding degree of fiber and resin in the 0° direction of the specimen is aggravated and obvious cracks appear, and the fiber distribution in the 90° direction is more neat, but there are fewer adherents. © 2024 Sichuan University. All rights reserved.

引用

页码：101 / 114

页数：13

共 27 条

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