采用超声高频疲劳试验机进行了LC4CS铝合金实验样本容量为66的超高周疲劳寿命实验.结果表明, 超高周疲劳寿命具有双峰分布特征, 这一特征与疲劳裂纹的萌生点有关:较短疲劳寿命的样品的裂纹萌生于夹杂等缺陷处, 而较长疲劳寿命的样品的裂纹萌生于表面. 寿命分布的双峰特征使得传统的升降法不能用于确定材料的超高周疲劳的条件疲劳极限, 超高周疲劳寿命的分散性远大于低周和高周疲劳寿命的分散性.
Very high cycle fatigue (VHCF) test of 66 aluminum alloy LC4CS specimens was done by piezo-electric fatigue testing machine and fatigue life data were obtained. It is found that the fatigue life distribution of LC4CS under very high cycle fatigue has the duplex peak property and this property is related with the locations of fatigue crack initiation. For the specimens with shorter fatigue life the fatigue cracks initiate at the defects such as inclusions and caves and for the longer the cracks initiate at the surfaces of the specimens. This property makes it inconsequential that the staircase method is used to measure the fatigue limit, and the fatigue life deviation of the VHCF is far larger than those of low cycle fatigue (LCF) and high cycle fatigue (HCF).
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