Influence of Measuring Method on Young's Modulus and Comparison with Young's Modulus and Mechanical Property of Sintered Irons

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In this study, the relationships between porosity and Youngs moduli measured by an acoustic pulse method, a resonance frequency technique, a tensile test and a bending test of sintered irons were investigated. Moreover, tensile strength and proof stress were measured by tensile test, and these values and Youngs modulus were evaluated against porosity. Youngs moduli measured by the acoustic pulse method, resonance frequency technique and tensile test, except for the bending test, were nearly equal at the same porosity. In the case of the bending test, the moment of inertia of the area was a linear function of porosity. Youngs modulus measured by the bending test, which was corrected by use of the above relation, was equal to that by other method. Youngs modulus measured by the bending test was 0.7-0.8 times of Youngs modulus measured by the tensile test. Youngs modulus (E), tensile strength (Ts) and proof stress (Ps) against porosity (P) are expressed as E=(E0-KE⋅P) (1-P), Ts=(Tso-KTs⋅P)(1-P) and Ps=(Pso-Kps⋅P)(1-P), respectively. Here, E0, Tso and Pso are Youngs modulus, tensile strength and proof stress at P=0, and KE, KTS and KPS are the experimental coefficients of each relation. Moreover, we found that the relationships among Youngs modulus, tensile strength and proof stress are in positive correlation.
社団法人粉体粉末冶金協会の論文
2003-02-15