钨含量和颗粒形状对钨合金力学性能的影响

采用MTS810材料疲劳实验系统,开展了不同粒径91钨合金材料的准静态单轴拉伸实验研究,获得了材料的应力应变曲线和静态力学性能参数。在此基础上,建立了能够反映钨合金材料宏微观特征的计算模型,数值计算了不同颗粒形状、不同钨含量合金材料在准静态拉伸载荷作用下的力学性能。得到了其整体的应力应变曲线以及钨合金屈服强度与钨合金微观参量之间的关系。并分析了钨合金材料的内部应力和应变场。结果表明:计算结果和实验结果吻合较好,随着钨含量的增加,钨合金的屈服强度增加,但其延伸率均降低;随着长径比的增加,钨合金的屈服强度有所增加,且随着长径比的增加,屈服强度的增加变得缓慢。为进一步钨合金材料性能的研究提供了重要的指导作用。

Effect of Content and Shape on Mechanical Propertiesof Tungsten Alloy

The MTS810 material fatigue test system was employed to carry the quasi-static tensile mechanical behavior study of tungsten alloys with different particle size, the stress-strain curves and the quasi-static parameters were obtained. Based on the experimental data, the calculation model which can reflect micro-structure property of tungsten alloy was established by Finite Element code. The mechanical properties of tungsten alloy which has different particle shape, different tungsten content under quasi-static tensile-loading were calculated. The stress-strain curve and the relationship between the micro-parameters and the mechanic characters of tungsten alloy were obtained. Also the inner stress and strain fields were described. The results showed that the numerical result was in agreement with the experimental result, the yield strength of the tungsten alloy increased with the tungsten content, while the elongation decreased, the yield strength of the tungsten alloy increased with the particle aspect ratio, and the increasing rate became slow down. It is valuable for further research of tungsten alloy properties.