考虑单元网格尺寸对船体碰撞失效仿真结果的影响，开展拉伸试验与仿真，通过回归分析得到网格尺寸与失效应变的函数关系，基于该函数对RTCL失效准则进行修正并编写VUMAT子程序。最后开展多种应力状态下的拉伸试验与仿真，对比修正前后仿真结果可知：修正方法可有效降低不同应力状态下仿真的网格尺寸效应，其中对于中低应力三轴度状态的修正效果显著，对于高应力三轴度状态的修正效果稍差。
Abstract
Considering the effect of mesh size on hull collision failure simulation results, the tensile tests and simulations were carried out. The function between mesh size and failure strain was obtained through regression analysis. Based on this function, the RTCL failure criterion was modified and VUMAT subroutine was written. Finally, tensile tests and simulations under various stress states were carried out. Compared with the simulation results before and after modification, it can be seen that the modified method can effectively reduce the mesh size effect under different stress states, of which the effect is significant for medium and low stress triaxiality, and slightly worse for high stress triaxiality.
关键词
RTCL准则 /
网格尺寸效应 /
单轴拉伸 /
VUMAT子程序
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Key words
RTCL failure criterion /
mesh size effect /
uniaxial tension /
VUMAT subroutine
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参考文献
[1] Alsos H S, Amdahl J, Hopperstad O S. On the resistance to penetration of stiffened plates, Part II: Numerical analysis[J]. International Journal of Impact Engineering, 2009, 36(7): 875-887.
[2] Hill R T. On discontinuous plastic states, with special reference to localized necking in thin sheets[J]. Journal of the Mechanics and Physics of Solids, 1952, 1(1): 19-30.
[3] Bressan J D, Williams J A. The use of a shear instability criterion to predict local necking in sheet metal deformation[J]. International Journal of Mechanical Sciences, 1983, 25(3): 155-168.
[4] Johnson G R. A constitutive model and data for materials subjected to large strains, high strain rates, and high temperatures[J]. Proc. 7th Inf. Sympo. Ballistics, 1983: 541-547.
[5] Tørnqvist R. Design of crashworthy ship structures[M]. Copenhagen :Technical University of Denmark, 2003.
[6] Rice J R, Tracey D M. On the ductile enlargement of voids in triaxial stress fields [J]. Journal of the Mechanics and Physics of Solids, 1969, 17(3): 201-217.
[7] Cockcroft MG, Latham DJ. Ductility and the workability of metals. Journal of the Institute of Metals 1968, 96:33–39.
[8] 王秀飞,刘昆,沈超明,等.交叉结构在面内冲压载荷作用下的损伤变形机理研究[J].振动与冲击,2021,401(21):62-68.
WANG Xiufei, LIU Kun, SHEN Chaoming, et al. Damage and deformation mechanism of cross structure under in-plane punching load [J].Journal of Vibration and Shock, 2021,401(21):62-68.
[9] 王自力,傅杰,王哲,等.考虑材料动态非线性影响的VLCC搁浅性能研究[J].振动与冲击,2017, 288(04):73-80.
WANG Zili, Fu Jie, WANG Zhe, et al. A study on the grounding performance of VLCC considering the influence of material dynamic nonlinearity[J].Journal of Vibration and Shock, 2017, 288(04):73-80.
[10] Marinatos J N, Samuelides M S. Towards a unified methodology for the simulation of rupture in collision and grounding of ships[J]. Marine Structures, 2015, 42: 1-32.
[11] Calle M A G, Verleysen P, Alves M. Benchmark study of failure criteria for ship collision modeling using purpose-designed tensile specimen geometries[J]. Marine structures, 2017, 53: 68-85.
[12] Ko Y K, Lee J S, Huh H, et al. Prediction of fracture in hub-hole expanding process using a new ductile fracture criterion[J]. Journal of materials processing technology, 2007, 187: 358-362.
[13] Bao Y, Wierzbicki T. On fracture locus in the equivalent strain and stress triaxiality space[J]. International Journal of Mechanical Sciences, 2004, 46(1): 81-98.
[14] Bao Y, Wierzbicki T. On the cut-off value of negative triaxiality for fracture[J]. Engineering fracture mechanics, 2005, 72(7): 1049-1069.
[15] GB/T 228.1-2010.金属材料拉伸实验第1部分:室温试验方法[S]. 北京：中国标准出版社, 2010.
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