Effect of welding initial imperfections on the ultimate strength of hull girder

序号	纵向构件尺寸/mm	类型	材料屈服应力σ_y/MPa
1	390×27	扁钢	392.0
2	333×9+100×16	T型钢	352.8
3	283×9+100×14	T型钢	352.8
4	283×9+100×18	T型钢	352.8
5	333×9+100×17	T型钢	352.8
6	283×9+100×16	T型钢	352.8
7	180×32.5×9.5	角钢	235.2
8	283×9+100×17	T型钢	352.8
9	333×9+100×18	T型钢	352.8
10	333×9+100×19	T型钢	352.8
11	383×9+100×17	T型钢	352.8
12	383×10+100×18	T型钢	352.8
13	383×10+100×21	T型钢	352.8
14	300×27	扁钢	392.0

Table 2. Meshing strategies
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Table 2. Meshing strategies
网格等级单元个数N 船体梁单元总数
板长方向相邻纵骨间加强筋腹板高度方向
粗糙 35 7 3 97 020
中等 49 9 5 182 182
精细 63 11 6 285 768

Table 3. Comparison of ultimate strength of different mesh models

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Table 3. Comparison of ultimate strength of different mesh models

	网格等级	本文极限强度值/(GN∙m)	提升率/%	ANSYS极限强度值 (IRS)/(GN∙m)^[22]	误差（相比IRS）/%
中拱	粗糙	19.402		18.396
	中等	18.741	3.41		1.88
	精细	18.603	0.74
中垂	粗糙	17.015		16.855
	中等	16.578	2.57		1.02
	精细	16.504	0.45

Table 4. Level of initial welding defects^[23]
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Table 4. Level of initial welding defects^[23]
水平 $ {A_0} $/mm $ {\sigma }_{\text{rcz}板} $/MPa
轻微 $0.025{\beta ^2}t$ $ - 0.05{\sigma _{\rm{y}}}$
平均 $0.1{\beta ^2}t$ $ - 0.15{\sigma _{\rm{y}}}$
严重 $0.3{\beta ^2}t$ $ - 0.3{\sigma _{\rm{y}}}$

Table 5. The effect of initial deformation on the ultimate strength of hull girder

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Table 5. The effect of initial deformation on the ultimate strength of hull girder

	初始变形水平
	无缺陷	轻微	平均	严重
中拱状态极限强度/(GN∙m)	18.741	18.094	17.540	16.795
影响/%		3.45	6.41	10.38
中垂状态极限强度/(GN∙m)	16.578	15.820	15.335	14.216
影响/%		4.57	7.50	14.25

Table 6. The effect of welding initial imperfection on the ultimate strength of hull girder at the average level

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Table 6. The effect of welding initial imperfection on the ultimate strength of hull girder at the average level

	初始缺陷
	无缺陷	只考虑焊接残余应力	只考虑焊接初始变形
中拱状态极限强度/(GN∙m)	18.741	18.037	17.540
影响/%		3.76	6.41
中垂状态极限强度/(GN∙m)	16.578	15.215	15.335
影响/%		8.22	7.50

Table 7. The effect of different welding initial deformation levels on the ultimate strength of hull girder (including average level of welding residual stress)

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Table 7. The effect of different welding initial deformation levels on the ultimate strength of hull girder (including average level of welding residual stress)

	初始变形水平
	无缺陷	轻微	平均	严重
中拱状态极限强度/(GN∙m)	18.741	17.987	17.492	16.555
影响/%		−4.02	−6.66	11.66
中垂状态极限强度/(GN∙m)	16.578	14.214	14.103	13.755
影响/%		14.26	−14.93	17.03

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Huwei CUI, Runwen HU, Zemin CHEN, Lu HUANG. Effect of welding initial imperfections on the ultimate strength of hull girder[J]. Chinese Journal of Ship Research, 2024, 19(6): 248

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Paper Information

Category: Ship Structure and Fittings

Received: Jul. 26, 2023

Accepted: --

Published Online: Mar. 14, 2025

The Author Email:

DOI:10.19693/j.issn.1673-3185.03476

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Sizes and material properties of longitudinal members

Table 1. Sizes and material properties of longitudinal members

Table 2. Meshing strategies

Table 2. Meshing strategies

Table 3. Comparison of ultimate strength of different mesh models

Table 3. Comparison of ultimate strength of different mesh models

Table 4. Level of initial welding defects[23]

Table 4. Level of initial welding defects[23]

Table 5. The effect of initial deformation on the ultimate strength of hull girder

Table 5. The effect of initial deformation on the ultimate strength of hull girder

Table 6. The effect of welding initial imperfection on the ultimate strength of hull girder at the average level

Table 6. The effect of welding initial imperfection on the ultimate strength of hull girder at the average level

Table 7. The effect of different welding initial deformation levels on the ultimate strength of hull girder (including average level of welding residual stress)

Table 7. The effect of different welding initial deformation levels on the ultimate strength of hull girder (including average level of welding residual stress)

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Table 4. Level of initial welding defects^[23]

Table 4. Level of initial welding defects^[23]