Dynamic impact between a viscoelastic ice floe and a rigid structure

• Published in: Cold regions science and technology 1996, Vol.24 (1), p.7-28
• Main Author: Morland, L.W.
• Format: Article
• Language: English
• Subjects: Approximation; Drag (hindrance); Dynamic structural analysis; Dynamics; Earth, ocean, space; Exact sciences and technology; External geophysics; Ice; Ice floes; Mathematical models; Nonlinearity; Oceans; Physics of the oceans; Plates (structural members); Q1; Sea ice; Stresses; Structural analysis; Velocity; Viscoelasticity; Waves
• ISSN: 0165-232X; 1872-7441
• DOI: 10.1016/0165-232X(95)00010-9

A one-dimensional wave analysis of the stress and velocity in a uniform ice plate impacting a rigid structure at low velocity, driven by the net effects of wind and ocean drag, determines the histories of stress on the structures and the motion of the plate. A linear viscoelastic ice response law is adopted which incorporates primary, secondary and tertiary creep effects consistent with observed (non-linear) response at a constant stress chosen to be a typical maximum magnitude. The linear elastic solution is a trivial special case. Comparisons are made with the corresponding quasistatic analysis, which neglects the non-rigid body accelerations and wave effects. A quasistatic treatment may be considered an approximation for low velocity impact, but the comparisons show otherwise. A non-linear elastic quasistatic solution is also compared.