arXiv 1006.22792010-06-11astro-ph.SRphysics.plasm-ph

中子星壳的破裂应力

Breaking stress of neutron star crust

A. I. Chugunov, C. J. Horowitz

备注：: 5 pages, 2 figures. Accepted for publication in MNRAS Letters
发表信息：: Mon. Not. Roy. Astron. Soc.: Letters, 407, L54-L58 (2010)
DOI：: 10.1111/j.1745-3933.2010.00903.x

摘要：

中子星地壳的破裂应力（应力-应变曲线的最大值）对中子星物理学有重要意义，包括脉冲星故障、静止山脉的引力波发射和星震耀斑。我们进行了许多分子动力学模拟的断裂应力在不同的耦合参数（逆温度）和应变率。我们描述我们的结果与Zhurkov模型的强度。我们应用这个模型来估计断裂应力的时间尺度为1秒-1年，这是最重要的应用程序，但远长于可以直接模拟。在这些时间尺度下，断裂应力强烈地依赖于温度。当耦合参数<200时，物质在很小的应力下破碎，如果它被应用几年。这种粘弹性蠕变可以限制中子星上山脉的寿命。我们还提出了一个替代模型的时间尺度无关的断裂应力，它可以用来估计断裂应力的上限。

英文摘要：

The breaking stress (the maximum of the stress-strain curve) of neutron star crust is important for neutron star physics including pulsar glitches, emission of gravitational waves from static mountains, and flares from star quakes. We perform many molecular dynamic simulations of the breaking stress at different coupling parameters (inverse temperatures) and strain rates. We describe our results with the Zhurkov model of strength. We apply this model to estimate the breaking stress for timescales ~1 s - 1 year, which are most important for applications, but much longer than can be directly simulated. At these timescales the breaking stress depends strongly on the temperature. For coupling parameter <200, matter breaks at very small stress, if it is applied for a few years. This viscoelastic creep can limit the lifetime of mountains on neutron stars. We also suggest an alternative model of timescale-independent breaking stress, which can be used to estimate an upper limit on the breaking stress.

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