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首页> 外文会议>Proceedings of International conference on airworthiness amp; fatigue >From monoscale to multiscale modeling of fatigue crack growth:stress and energy density factor
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From monoscale to multiscale modeling of fatigue crack growth:stress and energy density factor

机译：从单尺度到多尺度疲劳裂纹扩展建模：应力和能量密度因子

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摘要

The formalism of the earlier fatigue crack growth models is retained to account for multiscaling of the fatigue process that involves the creation of macrocracks from the accumulation of micro damage.The effects of at least two scales,say micro to macro,must be accounted for.The same data can thus be reinterpreted by the invariancy of the transitional stress intensity factors such that the microcracking and macrocracking data would lie on a straight line.The threshold associated with the sigmoidal curve disappears.Scale segmentation is shown to be a necessity for addressing multiscale energy dissipative processes such as fatigue and creep.Path independency and energy release rate are monoscale criteria that can lead to unphysical results,violating the first principle.Application of monoscale failure or fracture criteria to nanomaterials is taking toll at the expense of manufacturing super strength and light materials and structural components.This brief view is offered in the spirit of much needed additional research for the reinforcement of materials by creating nanoscale interfaces with sustainable time in service.The step by step consideraton at the different scales may offer a better understanding of the test data and their limitations with reference to space and time.
机译：保留了早期疲劳裂纹扩展模型的形式，以解决疲劳过程的多尺度问题，该过程涉及从微观损伤的累积中产生宏观裂纹。必须考虑至少两个尺度（从微观到宏观）的影响。因此，相同的数据可以由过渡应力强度因子的不变性来重新解释，从而使微裂纹和大裂纹数据位于一条直线上。与S形曲线相关的阈值消失了。显示出尺度分割是解决多尺度问题的必要条件耗能过程，例如疲劳和蠕变。路径独立性和能量释放速率是单尺度标准，可能会导致非物理结果，这违反了第一原理。将单尺度破坏或断裂标准应用于纳米材料正在付出巨大的代价，却以制造超强度和高强度为代价。轻质材料和结构部件。通过创建具有可持续服役时间的纳米级界面，急需进行更多的材料增强研究。不同规模的逐步考虑可以更好地理解测试数据及其在空间和时间方面的局限性。

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