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本实验用声发射方法研究攀钢轨梁厂50公斤级PD-I重轨钢的断裂韧性K_(1c)和疲劳裂纹的扩展,得到了在材料失稳扩展和断裂时都有大量的声发射信号出现的结果和声发射总计数N与裂纹扩展量a在失稳扩展前的一段呈线性关系。各钢轨的声发射率按dN_(AE)/dn=C(ΔK)~m关系处理,在对数坐标上得到dN_(AE)/dn与ΔK的关系是线性的,与Mori等人研究的AISI304不锈钢结果一致。这为估计材料的使用寿命提供了简易方法。
In this experiment, the fracture toughness K_ (1c) and fatigue crack propagation of 50 kg class PD-I heavy rail steel in Panzhihua Iron and Steel Co., Ltd. were studied by acoustic emission method. A lot of acoustic emission was obtained when the material destabilized and ruptured The result of the signal and the total number of acoustic emission, N, are in a linear relationship with the crack propagation a before the instability expansion. Acoustic emissivity of each rail is treated as dN_ (AE) / dn = C (ΔK) ~m. The relationship between dN_ (AE) / dn and ΔK obtained on logarithmic scale is linear. Stainless steel consistent results. This provides an easy way to estimate the useful life of the material.