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Ballistic Penetration of Dyneema Fiber Laminate

Zuoguang ZHANG , Shiguang , SHEN Huancheng SONG and Daxing ZHANG(Dept. of Materials Science and Engineering , Beijing University of Aeronautics and Astronaustics , Beijing 100083 , China)

材料科学技术（英文）

UHMWPE fiber (Dyneema) reinforced composites are an important class of materials for armors.These materials provide superior ballistic performance to the armor, such as the military armor systems requiring a reduction in back-armor effects or a substrate for hardened facings of steet or ceramic. The reported work characterized the ballistic impact and mechanical performance of Dyneema fiber in composite laminates. The capability of the laminate to absorb ballistic impact energy was influenced by the impact velocity and the laminate areal density. Two kinds of penetration were compared and a two-step model for the penetration was proposed.

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Design of Hybrid Composites with Zero Coefficient of Thermal Expansion

Zuoguang ZHANG , Weihong ZHONG and Huancheng SONG(Dept. of Materials Science and Engineering , Beijing University of Aeronautics and Astronautics , Beijing 100083 , China)

材料科学技术（英文）

Structures used in aerospace are influenced by temperature. So coefficient of thermal expansion (CTE) is not only an important parameter of materials, but also a significant parameter of structural design of spacecrafts with high dimensional stability. In this paper, based on the analysis of the data from tests, theoretical formulae for predicting CTE and mechanical properties of hybrid composites are presented, and the calculation program is compiled. All the equations are verified by experiments. Optimization is conducted by computer. The results and methods presented in this paper can be used both in optimal design of hybrid composites with zero CTE and in design of hybrid composites with any certain CTE value

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Investigation on Hygrothermal Effect of Hybrid Composites

Zuoguang ZHANG , Weihong ZHONG and Zhiyong LIANG (Dept. of Materials Science and Engineering , Beijing University of Aeronautics and Astronautics , Beijing 100083 , China)(To whom correspondence should be addressed)

材料科学技术（英文）

In this paper, moisture absorption characteristics of Carbon/Glass and Carbon/Aramid hybrid composites with bo types of matrices are investigated. The weight gain of the specimens are tested at 80℃. It is found that the water diffusion in hybrid composites can be described by Fickian process. The Step-by-step model and new thermal model are developed to estimate the equilibrium moisture content (Mm) and water diffusion coefficient (D) in hybrid composites using the hybrid structure parameters (hybrid ratio and hybrid intedece number). The estimated values are in good agreement with the experimental results.

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