Numerical Investigation on Ultimate Compressive Strength of Welded Stiffened Plates Built by Steel Grades of S235–S390

Li, Chenfeng; Dong, Sen; Wang, Tingce; Xu, Wu; Zhou, Xueqian

doi:10.3390/app9102088

Cited by 10 publications

(9 citation statements)

References 21 publications

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“…Also, welding imperfections may occur in offshore constructions. During preparation of the structure, numerical analysis can be used for prediction the potential location of the failure [13,14]. Welding of HSLA steels in the air is a well-known process.…”

Section: Introductionmentioning

confidence: 99%

Underwater In Situ Local Heat Treatment by Additional Stitches for Improving the Weldability of Steel

Tomków

Janeczek

2020

Applied Sciences

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In this paper the influence of in situ local heat treatment performed by additional stitches on the weldability of high-strength low-alloy (HSLA) S355J2C+N steel was tested. The investigated steel is characterized by high susceptibility to cold cracking. It is necessary to find a method to improve the quality of welded joints. The local heat treatment was applied as an effect of bead-on plate welding made on the face of a Tekken test joint. The specimens were made by the use of covered electrodes in the water environment. For testing weldability, Tekken test specimens were made. Then, the different number of the pad welds with different overlapping were laid on the face of the tested welds. Non-destructive (NDT) visual and penetrant tests were undertaken. During the NDT, imperfections like shape mistakes and spatters were found. Then, metallographic macro- and microscopic testing were performed. The macroscopic observations proved that water environment can generate imperfections like cracking and pores. However, for specimens with additional stitches the number of imperfections decreased. Microscopic tests proved that the proposed technique affected the structure of the heat-affected zone (HAZ). The specimens without the application of additional stitches are characterized by brittle bainitic and martensitic structure. Specimens, in which the additional stitches were applied, contain tempered martensite, fine ferrite and fine pearlite in their HAZ. It was also observed that the number of cracks decreased for in situ local heat-treatment specimens. The final step was Vickers HV10 hardness measurement. These measurements confirmed previous results. The heat from additional stitches affected the steel by significantly decreasing the hardness by 80–100 HV10. The results of experiments showed that the heat from pad welds provided microstructural changes in heat-affected zones and a decrease in the susceptibility to cold cracking, which results in improvement in the weldability of HSLA steel in wet welding conditions.

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Section: Introductionmentioning

confidence: 99%

Underwater In Situ Local Heat Treatment by Additional Stitches for Improving the Weldability of Steel

Tomków

Janeczek

2020

Applied Sciences

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“…With regards to the effect of material grade on ultimate strength of stiffened panel, Li et al [57] provided the investigation results using the ABAQUS numerical simulation code by using the arc-length method and allowing large displacement of the structures. They only modelled the single plate-stiffener combination (PSC) model, but the results may be useful for the comparison of different yield strength effects.…”

Section: Additional Considerationsmentioning

confidence: 99%

“…Prior to this study, Kim et al [21] stated this fluctuation behaviour in small column slenderness ratios. Li et al [57] also mentioned that the maximum reduction due to welding-induced residual stress effect might be 10%. It was also stated by Khan and Zhang [52] that 10-13% of ultimate strength decreased due to the effect of compressive residual stress.…”

Section: Additional Considerationsmentioning

confidence: 99%

Ultimate Compressive Strength of Stiffened Panel: An Empirical Formulation for Flat-Bar Type

Kim

Lim

et al. 2020

JMSE

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This research aims to study the ultimate limit state (ULS) behaviour of stiffened panel under longitudinal compression by a non-linear finite element method (NLFEM). There are different types of stiffeners mainly being used in shipbuilding, i.e., T-bar, flat-bar, and angle-bar. However, this research focuses on the ultimate compressive strength behaviour of flat-bar stiffened panel. A total of 420 reliable scenarios of flat-bar stiffened panel were selected for numerical simulation by the ANSYS NLFEM. The ultimate strength behaviours obtained were used as data for the development of closed form shape empirical formulation. Recently, our group proposed an advanced empirical formulation for T-bar stiffened panel, and the applicability of the proposed formulation to flat-bar stiffened panel is confirmed by this study. The accuracy of the empirical formulation obtained for flat-bar stiffened panel was validated by finite element (FE) simulation results of statistical analysis (R2 = 0.9435). The outcome obtained will be useful for ship structural designers in predicting the ultimate strength performance of flat-bar type stiffened panel under longitudinal compression.

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“…Based on the test results, a finite element numerical model was established to analyze the parameters of the box-type axial compression member, and some suggestions on the design of a high-strength steel welded axial compression member were given by comparing European EN1993-1-1 [ 27 ] and China GB50017-2003 [ 28 ]. Li et al [ 29 , 30 ] discussed the influence of welding residual stress by comparing the results obtained without accounting for the welding residual stress on the ultimate strength of stiffened plates under uniaxial compressive load by nonlinear finite element analysis. Xiao et al [ 31 ] studied the microstructure and mechanical properties of welded joints of BS700MC high-strength steel used for automotive girders through crack sensitivity, micro-hardness, bending, impact, tensile test, and micro-structural observation.…”

Section: Introductionmentioning

confidence: 99%

Research on Residual Stress of a BS700 Butt-Welded Box Section and Its Influence on the Stability of Axial Compression Members

et al. 2020

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BS700 high-strength steel is widely used in engineering. Welding residual stress during the manufacturing process has a significant influence on the structural safety and service life of steel structures. In this study, the residual stress of a BS700 butt-welded box section axial compression member was studied by the blind-hole method, its distribution law was summarized, and a residual stress distribution model was established. By establishing a finite element model considering initial geometric imperfection and residual stress, the influence of residual stress on the stability of axial compression members was analyzed. The results illustrated that the residual tensile stress near the weld in the welded box section axial compression members was the largest: the average residual tensile stress reached 76.6% of the measured steel yield strength, the residual tensile stress at the roof and web were almost the same, and the residual tensile stress at the corner was approximately 11.6% of the measured yield strength. The residual stress had a different influence on the stability factor of the axial compression members with different width-thickness ratios, and the influence decreased with the increase in the width-thickness ratio. In addition, when the slenderness ratio of members ranged between 20 and 70, the residual stress had a significant influence on the stability of members, while outside that interval, the influence was relatively small.

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Numerical Investigation on Ultimate Compressive Strength of Welded Stiffened Plates Built by Steel Grades of S235–S390

Cited by 10 publications

References 21 publications

Underwater In Situ Local Heat Treatment by Additional Stitches for Improving the Weldability of Steel

Underwater In Situ Local Heat Treatment by Additional Stitches for Improving the Weldability of Steel

Ultimate Compressive Strength of Stiffened Panel: An Empirical Formulation for Flat-Bar Type

Research on Residual Stress of a BS700 Butt-Welded Box Section and Its Influence on the Stability of Axial Compression Members

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