TA5钛合金焊接接头的低周疲劳性能

Low cycle fatigue property of TA5 titanium alloy welded joint

分析了TA5钛合金不同余高焊接接头的低周疲劳性能。结果表明,当TA5钛合金焊接接头工作在应变值小于0.35%时,焊接接头的低周疲劳寿命随焊接接头余高的增加而降低,当应变值高于0.35%时规律不明显。在较高应力应变条件下,呈循环软化特性,在低应力应变条件下的循环硬化特性不明显。同时,给出了焊接接头的循环应力应变曲线的表达式。以及焊接接头光滑试样的低周疲劳寿命表达式。

The low cycle fatigue property of TA5 Titanium alloy welded joint with different reinforcement was investigated. The result shows that the increasing of weld reinforcement decreases the low cycle fatigue life of welded joint when the TA5 titanium alloy welded joint is working in the strain value is less than 0.35%. When the strain value is higher than 0.35%, the rule is not obvious. In high stress-strain condition, the low cycle fatigue life of TA5 Titanium alloy welded joint is under the circulatory hardening, and in low stress-strain condition, its circulatory hardening property is not obvious. The expression of the circulatory stress strain of welded joint and the low cycle fatigue life of its smooth sampling were shown.