三维六向编织复合材料拉伸性能的实验研究

通过三维六向编织T700/TDE86复合材料的纵向拉伸实验,从宏观角度研究了其力学行为,获得了这些材料的主要力学性能参数及破坏规律.实验结果表明,影响三维六向编织复合材料力学性能的最主要参数是编织角,材料的拉伸弹性模量和拉伸强度受编织角的影响显著；编织角较小时,拉伸应力-应变曲线接近于线性,材料表现为脆性特征.本文还利用OLYMPUS体视显微镜对试件断口进行了观察,并对三维六向编织复合材料的破坏机制进行了分析.所得结论为进一步研究三维六向编织复合材料的刚度和强度预报奠定了实验基础.

Experimental Investigation on Tensile Mechanical Properties of 3D Six-Directional Braided Composite

The longitudinal tensile tests have been done for the 3D six-directional braided T700/TDE86 composite.From the macroscopic view,the mechanical behaviors are investigated and some principal mechanical parameters and failure modes are obtained.The experimental results show that the braided angle is the most important parameter to affect the mechanical properties of the 3D six-directional braided composite.Tensile modulus and strength have been obviously affected by the braided angle.When the braided angle is small,stress-strain curves of tension tend to linearity and the material behaves as brittle characteristics.On the basis of tensile tests,the OLYMPUS microscope is used to observe the broken specimens and to analyze the failure mechanism of the material,from which some important conclusions are drawn.These results can provide an experimental basis for further research on prediction of stiffness and strength of the 3D six-directional braided composite.