论疲劳现象的物理根源
On the physical origin of fatigue phenomena
摘要:
分数幂律材料的行为已被研究的框架内的一个修改的平均场论,其中高温结构的前体在晶体或多晶材料被视为部分有序的液体在很宽的温度范围内。通过这样做,可以通过修改的Landau-Khalatnikov方程来研究材料的弛豫行为。然后变得清楚的是,作为分数幂律行为的特殊情况,看似完全不同的疲劳现象和物理退化由基本物理现象支配,即,在一系列原子弛豫过程中,有序结构和部分有序高温结构前体之间的竞争。
英文摘要:
The fractional power-law material behavior has been investigated within the framework of a modified mean field theory, in which high-temperature structure precursors in a crystalline or polycrystalline material are treated as a partially ordered liquid over a wide range of temperature. By doing so, the relaxation behavior of the material can be studied via a modified Landau-Khalatnikov equation. It then becomes clear that, as the special cases of the fractional power-law behavior, seemingly quite different fatigue phenomena and physical deterioration are governed by a fundamental physical phenomenon, i.e., the competition between ordered structures and partially ordered high-temperature structure precursors during a series of atomic relaxation processes.
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