薄板对接超声疲劳试样设计方法及其误差分析
Design method and error analysis of thin plate butt welded joint specimen for ultrasonic fatigue test
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摘要: 采用解析法得到了含中部等截面段狗骨形薄板超声疲劳试样谐振长度的计算公式，并得出沿谐振长度方向的位移及应力幅分布函数. 为了验证上述计算方法用于薄板对接超声疲劳试样设计的精确度，对考虑与不考虑焊缝余高时的薄板试样与薄板对接试样分别建立有限元模型并进行模态分析. 结果表明，采用上述计算方法进行薄板超声疲劳试样设计的频率误差小于1%，且对比得出由于焊缝余高的存在使得其频率误差增大约1.7%. 另外，采用上述方法设计了低合金钢Q345薄板对接超声疲劳试样，通过超声疲劳试验进一步验证了上述方法的精确度.
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关键词:
- 超声疲劳|试样设计|有限元|误差
Abstract: The calculation formula of the resonance length of the dog-bone-shaped thin plate specimen with middle equal section for ultrasonic fatigue test was obtained by analytical solution, meanwhile the distribution functions of the displacement and stress amplitude along the resonance length were given. Considering weld reinforcement or not, finite element models of thin plate specimen and thin plate butt specimen were built respectively, and then modal results were analyzed. The results showed that the relative frequency error of the analytical method is less than 1%, while the frequency error caused by the weld reinforcement increased by about 1.7%. Moreover, the thin plate butt specimen of low-alloy steel Q345 was designed based on the above method, and then ultrasonic fatigue tests were conducted to verify the accuracy of the resonant frequency. -
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