Mechanical strength test method for solder ball joint in BGA package

2005 ◽  
Vol 11 (2) ◽  
pp. 121-129 ◽  
Author(s):  
Jong-Woong Kim ◽  
Dae-Gon Kim ◽  
Seung-Boo Jung
Keyword(s):  
Mechanical Strength ◽  
Solder Ball ◽  
Strength Test ◽  
Test Method ◽  
Ball Joint ◽  
Bga Package

scholarly journals Solder Ball Test Method

2012 ◽  
Vol 63 (11) ◽  
pp. 666-669
Author(s):  
Tadashi TORIMITSU
Keyword(s):  
Solder Ball ◽  
Test Method ◽  
Ball Test

Experimental Studies on Pb-Bi Flow Technology and Steel Compatibility With Pb-Bi

2004 ◽  
Author(s):  
Masatoshi Kondo ◽  
Minoru Takahashi ◽  
Susumu Yoshida ◽  
Naoki Sawada ◽  
Akira Yamada ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Oxide Layer ◽  
Oxygen Concentration ◽  
Corrosion Test ◽  
Oxygen Sensor ◽  
Performance Test ◽  
Pipe Wall ◽  
Steel Corrosion ◽  
Strength Test ◽  
Steel Matrix

For the development of the Pb-Bi cooled FBR and the ADS with Pb-Bi target, the compatibility of steels for core, structural and window materials with high temperature Pb-Bi is one of the critical issues. The effect of corrosion on the mechanical strength of steels should be also concerned. An oxide layer which is formed and self-healed on the steel surface in Pb-Bi is expected to improve the compatibility if oxide potential in Pb-Bi is controlled and monitored adequately to form stable oxide layer. Therefore, monitoring technology of oxygen concentration in Pb-Bi is required. In the present study, a performance test of oxygen sensor, a steel corrosion test and a steel mechanical strength test, or a pipe rupture test, were performed as follows: (1) Test of oxygen sensor: For the monitor of the oxygen potential in Pb-Bi, a thermal stress proof type oxygen sensor made of electrolyte conductor (MgO-ZrO2 and Y2O3-ZrO2) with the reference fluid of oxygen saturated bismuth was developed, and the performance test was conducted using the corrosion test loop. The performance was stable and reliable in the 1000-hour operation. The electromotive forces (EMF) of the sensor cells of MgO-ZrO2 and Y2O3-ZrO2 were nearly the same as each other, and they were not destructed during the 1000-operation. (2) Steel corrosion test: High Cr steels including heat resisting steels were exposed to a liquid Pb-Bi flow at the temperature of 550°C, the velocity of 1m/s, the oxygen concentration of 1.7×10−8wt% and the temperature difference of 150°C for 1000 and 500 hours. It was found that weight losses were lower in general in the steels with higher Cr content. The steels with high Cr, Si and Al formed thin oxide layers and exhibited better compatibility with Pb-Bi. (3) Steel mechanical strength test (pipe rupture test): Metallurgical analysis for ruptured pipe made of SS-316 was performed. The pipe had experienced the exposure to Pb-Bi at 400°C for 3440 hours, at 350°C for 4 hours, at 300°C for 50 hours, and at 250°C for 622 hours. Pipe rupture occurred possibly due to thermal expansion of Pb-Bi at heat-up processes. The results of the analysis indicated that Pb-Bi penetration to steel matrix occurred more seriously near the ruptured part than the other part of the pipe. The analytical result suggested that a brittle fracture might occur in the inner part of the ruptured pipe wall by liquid metal embrittlement because of Pb-Bi penetration, whereas dimples observed suggested that ductile fracture might occur in the outer part of the ruptured pipe wall.

Structure Analysis of Solder Ball Joint Interface on Electroless Ni-B with Immersion Au deposition

2005 ◽  
Vol 8 (1) ◽  
pp. 59-64
Author(s):  
Takashi SUGIZAKI ◽  
Yasuji FUJITA ◽  
Takashi KIMURA ◽  
Nobuhiro ISHIKAWA ◽  
Tohru WATANABE
Keyword(s):  
Structure Analysis ◽  
Solder Ball ◽  
Joint Interface ◽  
Ball Joint ◽  
Electroless Ni

scholarly journals An Innovative Test Method for Tensile Strength of Concrete by Applying the Strut-and-Tie Methodology

Materials ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 2776 ◽  
Author(s):  
Wen-Cheng Liao ◽  
Po-Shao Chen ◽  
Chung-Wen Hung ◽  
Suyash Kishor Wagh
Keyword(s):  
Tensile Strength ◽  
Test Methods ◽  
Standard Test ◽  
Strength Test ◽  
Tension Test ◽  
Test Method ◽  
Direct Tension ◽  
Direct Tension Test ◽  
Strut And Tie ◽  
Tensile Strength Test

Tensile strength is one of the important mechanical properties of concrete, but it is difficult to measure accurately due to the brittle nature of concrete in tension. The three widely used test methods for measuring the tensile strength of concrete each have their shortcomings: the direct tension test equipment is not easy to set up, particularly for alignment, and there are no standard test specifications; the tensile strengths obtained from the test method of splitting tensile strength (American Society for Testing and Materials, ASTM C496) and that of flexural strength of concrete (ASTM C78) are significantly different from the actual tensile strength owing to mechanisms of methodologies and test setup. The objective of this research is to develop a new concrete tensile strength test method that is easy to conduct and the result is close to the direct tension strength. By applying the strut-and-tie concept and modifying the experimental design of the ASTM C78, a new concrete tensile strength test method is proposed. The test results show that the concrete tensile strength obtained by this proposed method is close to the value obtained from the direct tension test for concrete with compressive strengths from 25 to 55 MPa. It shows that this innovative test method, which is precise and easy to conduct, can be an effective alternative for tensile strength of concrete.

Bonding strength test method assessment for Cross-Laminated Timber Derived Stressed-Skin Panels (CLT SSP)

2017 ◽  
Vol 50 (4) ◽  
Author(s):  
Emilio Luengo ◽  
Eva Hermoso ◽  
Juan Carlos Cabrero ◽  
Francisco Arriaga
Keyword(s):  
Bonding Strength ◽  
Strength Test ◽  
Test Method ◽  
Cross Laminated Timber ◽  
Skin Panels

Development of a shear strength test method for NITE–SiC joining material

2011 ◽  
Vol 417 (1-3) ◽  
pp. 383-386 ◽  
Author(s):  
Hun-Chea Jung ◽  
Tatsuya Hinoki ◽  
Yutai Katoh ◽  
Akira Kohyama
Keyword(s):  
Shear Strength ◽  
Strength Test ◽  
Test Method ◽  
Shear Strength Test

Influence of electroless PD plating film thickness on solder ball joint reliability

2018 ◽  
Author(s):  
Yoshinori Ejiri ◽  
Takehisa Sakurai ◽  
Yoshinori Arayama ◽  
Yoshiaki Tsubomatsu ◽  
Kiyoshi Hasegawa
Keyword(s):  
Film Thickness ◽  
Solder Ball ◽  
Ball Joint ◽  
Joint Reliability
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