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首页> 外文会议>Eighth International Fatigue Congress Vol.5, Jun 3-7, 2002, Stockholm, Sweden >GIGACYCLE FATIGUE PROPERTIES OF TI-6AL-4V UNDER UNIAXIAL TENSION
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GIGACYCLE FATIGUE PROPERTIES OF TI-6AL-4V UNDER UNIAXIAL TENSION

机译：单轴拉伸下TI-6AL-4V的巨球疲劳性能

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Uniaxial tension fatigue tests were carried out on (α+β) Ti-6Al-4V beyond 10~7-10~8 cycles. The effects of stress ratios on gigacycle fatigue were investigated based on SEM fractography. The S-N diagram under positive stress ratio had a complex folding shape, which corresponded to the locations of the fracture origins; i.e., surface-originating fractures in short life and interior-originating fractures in long life. A greater number of cycles were needed to induce interior fractures in negative stress ratios. The modified Goodman diagram estimated non-conservative fatigue strength, because positive stress ratio facilitates the interior-originating fractures in the very high cycle region. Clear differences between initial fracture surfaces of surface and interior fractures were observed. They seemed to result from the different surrounding environments of surface and interior cracks. Synergetic effects of a vacuum-like environment inside of the material and negative stress ratio were discussed with regard to gigacycle fatigue crack growth.
机译：对（α+β）Ti-6Al-4V进行了10〜7-10〜8个循环以上的单轴拉伸疲劳试验。基于SEM形貌，研究了应力比对摩托车疲劳的影响。正应力比下的S-N图具有复杂的折叠形状，对应于裂缝起点的位置。即，寿命短的起源于表面的裂缝和寿命长的内部起源的裂缝。需要更多的循环次数才能以负应力比率诱发内部裂缝。修改后的古德曼图估计了非保守疲劳强度，因为正应力比有助于在非常高的循环区域产生内部断裂。观察到表面裂缝和内部裂缝的初始裂缝表面之间存在明显差异。它们似乎是由于表面和内部裂缝的周围环境不同而引起的。讨论了材料内部真空状环境与负应力比对协同效应的影响，涉及千兆环疲劳裂纹扩展。

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