Study on the fatigue properties of the TA15 titanium alloy plate and electron beam welding specimen
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摘要: 通过对TA15钛合金薄板材料标准疲劳试件的疲劳试验结果分析处理和结构用板材2种应力水平下成组疲劳试验,建立了TA15板S-N曲线表达式.完成两种应力水平下TA15板电子束焊接试件疲劳试验,采用当量应力集中系数法,确定各试件的当量应力集中系数以及中值当量应力集中系数、安全当量应力集中系数.进而建立电子束焊接件的S-N曲线与p-S-N曲线,并对当量应力集中系数法的合理性进行了检验.最后对TA15板及电子束焊接件的疲劳特性做了对比分析.Abstract: Based on the analysis and processing of the fatigue test results of the standard specimens of the TA15 Titanium alloy thin plate and the fatigue test results of the plate at two stress levels, the S-N curve of TA15 plate was established. The fatigue tests at two stress levels were carried out for TA15 electron beam welding plate. The equivalent theoretical stress concentration coefficient of the welded specimens, the mean equivalent theoretical stress concentration coefficient and the reliable equivalent theoretical stress concentration coefficient were determined. Then, the S-N and p-S-N curves for the welded specimens were established. The equivalent Kt method was proved reasonable. Finally, a comparison was made between the fatigue properties of these two kinds of specimens.
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