Along the building direction, the fatigue behavior of an additively manufactured (AM) aluminium (AlSi10Mg) alloy was investigated in high-cycle and very-high-cycle regimes by using conventionally electromagnetic resonance and ultrasonic vibration with axial loading frequencies of ∼110 Hz and ∼20 k ± 500 Hz, respectively. No frequency effect was observed on the resulted fatigue strength and the fractography up to 10 cycles at stress ratio = –1. All cracks initiated at AM pores and the dominating one prefers shifting from specimen surface to subsurface with growing very-high-cycle fatigue (VHCF) lives. As the tensile mean stress increases, fatigue strength sharply drops in high value regime of ≥ 0.5 with annihilating VHCF occurrence, and the fatigue limits degrade on a Gerber relation beyond 10 cycles. At last, a fatigue failure map was proposed to directly describe the panorama of specimen lives under different external loads.

中文翻译：

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超声波和常规频率轴向循环下增材制造铝合金的高周和极高周疲劳


沿着构建方向，通过使用传统的电磁共振和超声波振动（轴向载荷频率为 ~110 Hz 和分别为〜20 k ± 500 Hz。在应力比 = –1 的情况下，在 10 个周期内没有观察到频率对最终疲劳强度和断口的影响。所有裂纹均在增材制造孔隙处引发，并且主要裂纹倾向于从样品表面转移至次表面，且甚高周疲劳 (VHCF) 寿命不断增长。随着拉伸平均应力的增加，疲劳强度在 ≥ 0.5 的高值范围内急剧下降，并消除 VHCF 的发生，并且疲劳极限在 Gerber 关系上超过 10 个循环后会降低。最后，提出了疲劳失效图来直接描述不同外部载荷下试件寿命的全景。