Effect of Mechanical Heterogeneity on Strain and Stress Fields at Crack Tips of SCC in Dissimilar Metal Welded Joints

Zhang, Shun; Xue, He; Wang, Shuai; Sun, Yuman; Yang, Fuqiang; Zhang, Yubiao

doi:10.3390/ma14164450

Cited by 6 publications

(5 citation statements)

References 35 publications

(46 reference statements)

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“…The sample leakage rate of 0.5mm sealing ring decreases from 1.8e-9Pa•m 3 /s to 4.3e-9Pa•m 3 /s, and becomes 3e-8Pa•m 3 /s after vibration. After the impact, great changes occurred, only 1.5e-6Pa•m 3 /s, and there were already large holes or cracks in the surface due to stress mismatch [13]. However, the internal interconnection point substrate remains intact, no short circuit and other conditions appear.…”

Section: The Sealing Ring Width and Pad Size Design Optimizationmentioning

confidence: 99%

Hermetic Interlayer Interconnection Technology Based on SAC305 Solder Paste

Hu,

Yan,

Wang

et al. 2024

Frontiers in Artificial Intelligence and Applications

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In order to improve the long-term service reliability of advanced electronic devices and reduce the risk of chip overheating failure in the production process, the interlayer gas-tight interconnection technology architecture is favored by researchers because of the design of gas-tight and electrical signal interconnection simultaneously achieved in a single welding. The main hermetic interconnection technology with gold convex spot or gold tin micro convex spot has the disadvantages of high production and high technical barriers, which restricts the vigorous development of the industry. This paper is based on cheap SAC305 solder paste which has been the emerging advanced electronic packaging field favorite to carry out corresponding research. With 0.75mm or 1mm wide sealing ring and size/spacing of 0.4mm/0.8mm, 0.6mm/1.2mm or 0.8mm/1.6mm substrate pad combination, with double-sided prefabricated solder process, the domestic and foreign leading gas tight interconnection index has been obtained, which is as low as 1.1e-9Pa·m3/s. Meanwhile, the planarity is <0.2/100. There is no obvious abnormal electrical interconnection, and there is no evident index decline after environmental adaptability assessment. The number of rewelding is ≥2. This special design provides a new idea for the selection of solder and architecture design in the field of gas tight packaging.

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Section: The Sealing Ring Width and Pad Size Design Optimizationmentioning

confidence: 99%

Hermetic Interlayer Interconnection Technology Based on SAC305 Solder Paste

Hu,

Yan,

Wang

et al. 2024

Frontiers in Artificial Intelligence and Applications

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“…Thus, two of the SCC's three components already exist in the weld joints, and when the weld joints are exposed to a corrosive environment, SCC can occur. The SCC behavior of fusion welding has been investigated using both experimental and numerical approaches via quantitative and qualitative methods [11][12][13][14][15][16][17]. Kim et al [11] studied the effect of residual stress on the SCC growth in GTAW joints.…”

Section: Figure 1 Stress Corrosion Crackingmentioning

confidence: 99%

“…Their finding suggests that increasing the dislocation density and the 3 boundaries from the top to the root of the weld metal could increase the susceptibility to SCC. Zhang et al [16] evaluated the crack tip heterogeneity of DMWJs using a numerical approach. On the base of the model, the authors concluded that the higher yield strength and hardening coefficient retain the SCC.…”

Section: Figure 1 Stress Corrosion Crackingmentioning

confidence: 99%

Optimum power for ER-70S-2 and SS400 dissimilar CDW joint

et al. 2023

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Selecting the right cutting tool material for the type of workpiece material plays a very important role in the machining process. The efficiency of the machining process is greatly influenced by this selection. The tables in the manuals or the manufacturer's instructions are commonly used documents for the selection of cutting tool materials. Within each of these document types, the cutting tool materials were described by different criteria. So, tool selection is considered as a multi-criteria decision-making activity. The values of the criteria for each type of cutting tool can be a number or a certain range. This study proposes a new method to rank and select cutting tools. First, a ranking of the solutions for each criterion will be performed. This ranking is based on the mean value of the criteria in each solution. Therefore, this method is called “Ranking the Solutions based on the Mean Value of Criteria - RSMVC”. The RSMVC method was proven to be a highly reliable method for ranking the cutting tool materials. These results were successfully verified when solving the problems in different cases of cutter material selection.

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“…In general, dissimilar metal-welded joints (DMWJs) in engineering structures are used to connect different metals. Due to strong heterogeneity of the microstructure and mechanical properties at the interface between two metal materials, this part is a weak link of the welded joint, which seriously affects the safety of engineering structures [ 1 , 2 , 3 ] and service life evaluation [ 4 , 5 ]. Therefore, it is of great significance to accurately design the integrity and evaluate the crack at the interface of bi-materials.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Influence of Ultimate-Strength Heterogeneity on Crack Propagation and Fracture Toughness in Welded Joints

Bi¹,

Yuan

Hao³

et al. 2022

Materials

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The mechanical properties of dissimilar metal-welded joint materials are heterogeneous, which is an obstacle to the safety evaluation of key welded structures. The variation of stress–strain conditions at the crack tip caused by mismatch of material mechanical properties in dissimilar metal-welded joints is an important factor affecting crack propagation behavior. To understand the influence of uneven distribution of ultimate strength of the base metal and the welded metal on the crack propagation path, fracture toughness, as well as the mechanical field at the crack tip in the small-scale yield range, the user-defined field variable subroutine method is used to express continuous variation characteristics of welded joint ultimate strength in finite element software. In addition, the J-integral during crack propagation is calculated, and the effect of the ultimate strength on the J-integral and the stress field at the crack tip are analyzed. The results show that as the crack propagation direction is perpendicular to the direction of ultimate strength, the gradient of ultimate strength increases from |Gy|= 50 to |Gy|= 100 MPa/mm, the crack deflection angle increases by 0.018%, and the crack length increases by 1.46%. The fracture toughness of the material decreased slightly during crack propagation. Under the condition that the crack propagation direction is the same as the direction of ultimate strength, the crack propagation path is a straight line. As the gradient of ultimate strength increases from Gx = 50 to Gx = 100 MPa/mm, the crack propagation length decreases by 5.17%, and the slope of fracture toughness curve increases by 51.63%. On the contrary, as the crack propagates to the low ultimate strength side, the crack propagation resistance decreases, the ultimate strength gradient increases from Gx = −100 to Gx = −50 MPa/mm, and the slope of the fracture toughness curve decreases by 51.01%. It is suggested to consider the relationship between crack growth behavior and ultimate strength when designing and evaluating the structural integrity of cracks at the material interface of dissimilar metal-welded joints.

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Effect of Mechanical Heterogeneity on Strain and Stress Fields at Crack Tips of SCC in Dissimilar Metal Welded Joints

Cited by 6 publications

References 35 publications

Hermetic Interlayer Interconnection Technology Based on SAC305 Solder Paste

Hermetic Interlayer Interconnection Technology Based on SAC305 Solder Paste

Optimum power for ER-70S-2 and SS400 dissimilar CDW joint

Numerical Investigation of the Influence of Ultimate-Strength Heterogeneity on Crack Propagation and Fracture Toughness in Welded Joints

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