Thermal fracturing on comets - Applications to 67P/Churyumov-Gerasimenko

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Table 1

Material properties used in our thermo-mechanical model based on those of Mellon (1997) and Mellon et al. (2008; see discussion and references therein for details).

Material property	Pure ice			Mixture (soil fraction = ϕ)
E (Pa)	2.339 × 10¹⁰ − 6.48 × 10⁷T			Same
ν	0.4			Same
α	2.47 × 10⁻⁷T − 1.17 × 10⁻⁵			Linear combination with

	T ≥ 234	234 > T ≥ 195	T < 195
Q (J mol⁻¹)	9.1 × 10⁴	6.1 × 10⁴	3.6 × 10⁴	Same
n	4.0	4.0	4.7	Same
A₀ (Pa⁻ⁿ s⁻¹)	10^−12.1	10^−18.9	10^−31.0	A = A₀e^−2nϕ

Notes. E is the Young’s modulus, ν is Poisson’s ratio, α the coefficient of thermal expansion, Q is activation energy, and n and A₀ are the two viscous terms.

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