Nondestructive evaluation of sintered iron using dynamic Young's modulus testing
Nondestructive evaluation of sintered iron using dynamic Young's modulus testing
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DOI：
10.1299/jsmea.44.1
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发表时间：
2001-01-01
期刊：
影响因子：
--
通讯作者：
Kohno, T
中科院分区：
文献类型：
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作者：
Hirose, N;Tanaka, S;Kohno, T
本文根据烧结铁的实验结果，研究了杨氏模量（E）仅取决于孔隙率（P）的模型，推导出了新的杨氏模量与孔隙率的关系式。通过应用声脉冲法和共振频率法得到的杨氏模量与孔隙率之间的关系，证实了该方程。导出的方程为E（P）=E-0（1- k（E）. P）。(1-P)其中k（E）和E-0分别是正常数和P=0时的E。该方程表明，1-P项代表孔隙度效应，1 - k（E）项代表孔隙度效应。P代表孔形态效应，如孔的形状、尺寸和互连。在P小于0.2的情况下，利用声脉冲法测得的纵波速度与横波速度的比值，提出了一种无损计算局部孔隙率和传播距离（如缺陷深度和试样厚度）的新方法。
In this study, the model in which Young's modulus (E) depends on only porosity (P) was investigated by the experimental results of sintered iron, and new equation of Young's modulus against porosity was derived. The equation was confirmed by applying to the relationship between Young's modulus and porosity obtained by the acoustic pulse method and the resonance frequency method. The derived equation is E(P)=E-0(1- k(E) . P) . (1-P), where k(E) and E-0 are a positive constant and E at P=0, respectively. This equation shows that the term of 1-P represents the porosity effect and the term of 1 - k(E) . P represents the pore morphology effect, such as shape, size and interconnection of pores. Furthermore, for P below 0.2, a new nondestructive method to calculate partial porosity and propagation distance, such as defect depth and sample thickness, was developed by using of the ratio of longitudinal wave velocity to shear wave velocity obtained by the acoustic pulse method.