Atomistic study on the anomalous temperature-dependent dynamic tensile strength of ice under shock loading

ABSTRACT

Although the compressive strength of ice under both quasi-static [M. Arakawa and N. Maeno, Mechanical strength of polycrystalline ice under uniaxial compression. Cold Reg. Sci. Tech 26 (1997), pp. 215–229.] and dynamic [X. Wu and V. Prakash, Dynamic compressive behavior of ice at cryogenic temperatures. Cold Reg. Sci. Tech 118 (2015), pp. 1–13.] loadings shows an anomalous temperature effect that the compression strength is insensitive to temperature in a specific temperature range below −100^oC, it is still unclear whether the anomalous temperature exists for the tensile strength of ice at cryogenic temperatures. In this paper, the temperature-dependent dynamic tensile strength of ice 1 h under shock loading is investigated by molecular dynamics simulations. It is intriguing to see that the dynamic tensile strength of the ice exhibits a similar anomalous temperature effect, i.e. it is almost insensitive to temperature in the range 117 ∼ 163 K, which could be interpreted by the competitive mechanism between shock-induced pulverisation and melting. The evolution of the pentagonal-heptagonal defects and the ductile-to-brittle transformation are also observed with decreasing temperature, leading to the unique dynamic tensile behaviour of ice under shock.

KEYWORDS:

• Dynamic tensile strength of ice
• anomalous temperature effect
• molecular dynamics simulation
• shock-induced pulverisation and melting
• pentagonal-heptagonal defects
• ductile-to-brittle transformation

Acknowledgments

This work was supported by the National Natural Science Foundation of China [Grant Nos. 11672315, and 11772347], Science Challenge Project [Grant No. TZ2018001], and the Strategic Priority Research Program of Chinese Academy of Sciences [Grant Nos. XDB22040302 and XDB22040303].

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by National Natural Science Foundation of China: [grant number 11672315,11772347]; Strategic Priority Research Program of Chinese Academy of Sciences: [grant number XDB22040302,XDB22040303]; Science Challenge Project: [grant number TZ2018001].