Response of low-temperature steel beams subjected to single and repeated lateral impacts

• Published in: International journal of naval architecture and ocean engineering 2018, 10(6), , pp.670-682
• Main Authors: Truong, Dac Dung, Jung, Hae-Jung, Shin, Hyun Kyoung, Cho, Sang-Rai
• Format: Article
• Language: English
• Subjects: Low-temperature steel beam; Numerical analysis; Repeated impact test; Sub-zero temperature; 조선공학
• ISSN: 2092-6782; 2092-6790
• DOI: 10.1016/j.ijnaoe.2017.10.002

This paper presents the experimental and numerical investigation results of the response of low-temperature steel (LT-FH32 grade steel) beams under repeated impacts at room temperature and a single impact at a sub-zero temperature. After conducting tensile tests at room and sub-zero, repeated impact tests were conducted on two clamped single-beam models at room temperature, and single-impact tests of two other clamped single-beam models were conducted at −50 °C. The single and repeated impact tests were conducted by releasing a knife-edge striker using a drop testing machine. The permanent deflection of the model measured after each impact gradually increased with increasing number of impacts. Under the reduced temperature, the permanent deflection of the models slightly decreased. The numerical analyses were also performed to predict the damage response of the tested single-beam models. A comparison of the numerical prediction with those of experiments showed quite reasonable agreement. •Tensile tests on low-temperature steel (LT-FH32 grade steel) were performed at various temperatures.•Repeated impact tests at room temperature and single-impact tests at a sub-zero temperature were conducted on clamped single-beam models were conducted.•The increments of deflection were reduced and the contact force increased but the impact duration decreased increasing the number of impacts.•The numerical predictions of permanent deflections developed to provide reasonable agreement with test results.•Effects of impact locations, strain-rate hardening, and boundary conditions on the responses of single-beams were numerically investigated.