论文部分内容阅读
解出了应力作用下梁的横向振动方程,结果表明,E=C(σ)ω~2,E是扬氏模量,C是应力σ的函数,ω是样品的固有频率。同时测量基波和高次谐波的频率,就可用计算机求出E和σ。 用静电激发调频检测法对比研究了电解充氢和人为部分应力松弛对纯铁扬氏模量的影响,结果表明:电解充氢能导致应力部分松弛,从而引起表观弹性模量的下降;在充氢和人为部分应力松弛后的室温时效过程中,应力都有部分回升,E也都升高0.1-0.3％;用排油取气法测得室温放出的氢量为7-8wppm,即7-8wppm的氢对和原子键合力有关弹性模量没有明显影响。 也应用悬丝共振法研究了氢对纯铁弹性模量的影响并获得了同样的结果。
The results show that E = C (σ) ω ~ 2, E is the Young’s modulus, C is the function of the stress σ, and ω is the natural frequency of the sample. While measuring the fundamental and higher harmonic frequencies, we can use the computer to find E and σ. Electrostatic charge-FM detection method was used to study the effect of hydrogen charging and artificial relaxation on the Young’s modulus of pure iron. The results show that the hydrogen partial pressure of electrolyte can be relaxed and the apparent elastic modulus decrease. In the process of aging at room temperature after hydrogen charging and artificial stress relaxation, the stress is partly recovered, and E also increases by 0.1-0.3%. The amount of hydrogen released at room temperature is 7-8wppm, ie, 7-8wppm, ie 7 A hydrogen content of -8 wppm had no significant effect on the elastic modulus with respect to the atomic bonding force. The effect of hydrogen on the elastic modulus of pure iron was also studied using the suspension wire resonance method and the same result was obtained.