[논문]Impact Bending Test Simulations of FH32 High-strength Steel for Arctic Marine Structures

Choung, Joonmo; Han, Donghwa; Noh, Myung-Hyun; Lee, Jae-Yik; Shim, Sanghoon

doi:10.5574/jaroe.2016.2.1.028

Abstract ▼ AI-Helper

This paper provides theoretical and experimental results to verify the crashworthiness of FH32 high-strength steel for arctic marine structures against ice impact. Assuming that side-shell structures of the Korean arctic research vessel, ARAON, with ice-notation PL10, collide with sheet ice, one-thi...

This paper provides theoretical and experimental results to verify the crashworthiness of FH32 high-strength steel for arctic marine structures against ice impact. Assuming that side-shell structures of the Korean arctic research vessel, ARAON, with ice-notation PL10, collide with sheet ice, one-third-scale test specimens with a single transverse frame are manufactured. Impact-bending tests were conducted using a rigid steel striker that mimics sheet ice. Drop height was calculated by considering the speed at which sheet ice is rammed. Prior to impact-bending tests, tensile coupon tests were conducted at various temperatures. The impact-bending tests were carried out using test specimens fully fixed to the inside bottom frame of a cold chamber. The drop-weight velocity and test specimen deformation speed were measured using a high-speed camera and digital image correlation analysis (DICA). Numerical simulations were carried out under the same conditions as the impact-bending tests. The simulation results were in agreement with the test results, and strain rate was a key factor for the accuracy of numerical simulations.

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문제 정의

This paper focuses on verification of the structural crashworthiness of newly developed F-grade steel. Static coupon tests were conducted at room temperature (RT), -20℃, -40℃, -60℃, and -80℃ using MTS UTM and a low-temperature chamber.

제안 방법

Dynamic camera and motion tracking systems were used to analyze the velocity of the drop impact striker and the bending displacement of specimens. Numerical simulations were reproduced to verify the accuracy of the experimental results.
(2013). Six levels of strain rate hardening were produced: static, 1/s, 10/s, 100/s, 1000/s, and 5000/s, which were used as inputs in dynamic-bending test simulations.
This paper focuses on verification of the structural crashworthiness of newly developed F-grade steel. Static coupon tests were conducted at room temperature (RT), -20℃, -40℃, -60℃, and -80℃ using MTS UTM and a low-temperature chamber. However, dynamic coupon tests could not be carried out due to a breakdown of the high-speed tensile test instrument, which is capable of a strain rate of ~1000/s.
Static tensile tests were carried out to determine the static flow stress at RT, -20℃, -4℃, -60℃, and -80℃. Mechanical propertiesRsuch as yield stress, tensile strength, plastic hardening exponent, and strength coefficienttimproved proportionally with the decrease in temperature.
The specimen was modeled using quadrilateral and triangular shell elements with a reduced integration scheme (S4R and S3R). Very fine elements of 0.
The tensile tests were performed at RT, -20℃, -40℃, -60℃, and -80℃. An MTS universal test machine (UTM) of 250 kN capacity was used with a liquid nitrogen (LN2)-type cooling chamber to lower the temperature to -200℃.

대상 데이터

Guidehole structures to improve the vertical straightness of drop motion were attached on both sides of the striker. The final mass was 425 kg, including the mass of the guide-hole structures.

이론/모형

ABAQUS/EXPLICIT (Simulia, 2008) was used for the impact-bending test simulations. The same finite element (FE) models as actual specimens were constructed.

참고문헌 (5)

American Society for Testing and Materials (ASTM) (2004). E8 - 04 Standard Test Methods for Tension Testing of Metallic Materials.
Choung, J, Nam, W, Lee, J.Y (2013). "Dynamic Hardening Behaviors of Various Marine Structural Steels Considering Dependencies on Strain Rate and Temperature," Marine Structures, Vol 32, pp49-67.

상세보기
Det Norske Veritas (DNV) (2012). "Rules for Classification of Ships Part5 Chapter 1 Ships for Navigation in Ice," DNV.
Kujala, P (1991). "Damage Statistics of Ice-strengthened Ships in the Baltic Sea Research report 50," Finnish Board of Navigation.
Simulia (2008). "ABAQUS Analysis User's Manual,"

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Impact Bending Test Simulations of FH32 High-strength Steel for Arctic Marine Structures 원문보기

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