钛制压力容器的室温蠕变极限载荷研究

Creep Limit Load Analyses for Titanium Pressure Vessels at Ambient Temperature

根据工业纯钛的室温蠕变等时应力-应变曲线,应用有限元方法研究了钛制压力容器的蠕变极限载荷。结果发现,随着室温蠕变时间的增加,压力容器蠕变极限载荷由快速下降趋于缓慢下降。以圆筒型压力容器为例,详细分析了径比K对极限载荷的影响规律,给出了室温蠕变极限载荷的预测公式。该公式能够体现蠕变时间对极限载荷的劣化作用,以及许用应变和径比K对极限载荷的影响。

Creep limit loads for TA2 made pressure vessels have been investigated by finite element（FE） method based on the isochronous stress-strain curves of commercial pure titanium at ambient temperature. The results show that creep limit loads will firstly decrease quickly and then decrease slowly with the time increasing. Taking the cylindrical pressure vessels as example, the influence of the radial ratio K on creep limit load has been analyzed, which provides estimating solutions for ambient temperature creep limit load prediction. These solutions can reflect the effect of the time degradation on limit load, and also the effect of allowable strain and radial ratio K on the limit load.