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首页> 外文期刊>Research in nondestructive evaluation: a journal of the American Society for Nondestructive Testing >ACOUSTIC EMISSION DURING TENSILE DEFORMATION OF SMOOTH AND NOTCHED SPECIMENS OF NEAR ALPHA TITANIUM ALLOY
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ACOUSTIC EMISSION DURING TENSILE DEFORMATION OF SMOOTH AND NOTCHED SPECIMENS OF NEAR ALPHA TITANIUM ALLOY

机译:阿尔法钛合金光滑度和缺口试样拉伸变形过程中的声发射

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摘要

Acoustic emission (AE) generated during tensile deformation of smooth and notched specimens of near Alpha titanium alloy have been studied. A few tests carried out with both types of specimens were also interrupted in order to correlate with the damage mechanism. The results have shown higher acoustic emission during yielding and reduced AE at higher strain level in the smooth specimen. A peak in the root mean square (RMS) voltage at higher strain was associated with the initiation of microcrack. In the notched specimen, localized deformation at the notch tip gives rise to detectable AE in the region prior to macroscopic yielding and gives intense AE at lower strain compared to net section yielding. This is characterized by peak amplitude distribution of hits in which majority of the hits are shifted to lower amplitudes in notched specimens as compared to the smooth specimen. The AE results have been supported by microstructural investigations.
机译:研究了在接近Alpha钛合金的光滑且有缺口的试样拉伸变形过程中产生的声发射(AE)。为了与损坏机理相关联,还中断了对两种类型的标本进行的一些测试。结果表明,在光滑试样中,在屈服过程中声发射较高,而在较高应变水平下,声发射降低。较高应变下的均方根(RMS)电压峰值与微裂纹的产生有关。在带缺口的样品中,在宏观屈服之前,在缺口尖端处的局部变形会导致可检测到的AE,并且与净截面屈服相比,在较低应变下会产生强AE。其特征是命中的峰值幅度分布,其中与光滑样本相比,大多数命中在有缺口的样本中偏移到较低的幅度。 AE结果得到了微结构研究的支持。

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