“…In hard grounding analysis authors have focused on penetration and crushing mechanisms by the hard obstruction (see e.g. Amdahl et al [2], Kulzep [33], Naar et al [44] Peschmann [54], Simonsen and Wierzbicki [73], Simonsen [69], [72] and Zhang and Suzuki [85]). This resembles the collision problem.…”