新型钛合金材料疲劳裂纹扩展试验研究

Experimental study on fatigue crack growth of new titanium alloy materials

随着载人潜水器下潜深度的增加,现有的钛合金材料已不能满足耐压壳结构的设计要求,因此,针对新型钛合金力学性能和疲劳性能研究尤其重要。本文对新型钛合金材料室温下的力学性能、断裂韧性、不同载荷比以及不同温度下的疲劳裂纹扩展行为开展试验研究,并将新钛合金材料的试验结果与其他钛合金疲劳裂纹扩展行为进行对比分析。研究结果表明,新型钛合金材料的断裂韧性明显高于其他几种钛合金材料,载荷比R对新型钛合金的疲劳裂纹扩展速率影响明显,低温环境下新型钛合金疲劳裂纹扩展的抵抗能力得到加强。相比其他钛合金材料,新型钛合金材料抗疲劳性能较优,因此新型钛合金材料具有更广泛的应用前景。

With the increase of the submersible depth of the manned submersible, the existing titanium alloy material can not meet the requirements of the design of the pressure-resistant shell structure. Therefore, it is especially important to study the mechanical properties and fatigue properties of the new titanium alloy. In this paper, the experimental study on the mechanical properties, fracture toughness, different load ratios and fatigue crack propagation behavior of new titanium alloy materials at room temperature is carried out, and the test results of new titanium alloy materials and fatigue crack growth behavior of other titanium alloys are carried out. Comparative analysis. The results show that the fracture toughness of the new titanium alloy is significantly higher than that of other titanium alloys;the load ratio R has a significant effect on the fatigue crack growth rate of the new titanium alloy;the resistance to fatigue crack growth of the new titanium alloy in low temperature environment is obtained. The new titanium alloy material has better fatigue resistance than other titanium alloy materials,so the new titanium alloy material has wider application prospects.