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  • 1
    Electronic Resource
    Electronic Resource
    Fatigue Analysis of Multi-Lap Spot Welding of High Strength Steel by Quasi Static Tensile-Shear Test (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 345-346 (Aug. 2007), p. 251-254 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The welding quality of spot weldment is an important factor that significantly affects thestrength, stiffness, safety, and other performance characteristics of vehicles. Therefore, qualitycontrol and fatigue life evaluation of spot weldment are necessary processes. This paper presents amethod for determining the fatigue life of multi-lap spot weldment of a high strength steel sheet. Inthis method, the fatigue life is estimated by using the lethargy coefficient, which is the total defectcoefficient according to rupture stress and time obtained by the quasi static tensile-shear test. Also,in this study, we modified the lethargy coefficient by using the welding current. And, we define aspecific lapping constant, which is a characteristic constant of 2 or 3 lap weldments. The fatigue lifeobtained by the fatigue estimate equation, which contains a specific lapping constant was comparedand verified with an experimental value. And we analyzed the relation of lap number, weldingcurrent and fatigue life. This method can save processing time and cost for predicting the life cycleof a structure
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.345-346.251.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Fatigue Life of Multi-Lap Welding of Automotives Steel Sheet by QSTS (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 151-156 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper shows how the number of lap of spot welded joints in automotive steel sheetschanges the life -cycle transform of itself. There has been significant developments in the lifeextension of automotive steel sheets, as well as in passenger safety. We verified the validity of theS-N curve of materials by QSTS test. Moreover, we used EZNCEN and HS40R, which are commonlyused as automotive steel sheets because of their excellence in increasing fuel efficiency. The purposeof research was to compare the fatigue life of multi - lap of spot welded joints to there. In addition s,we used the two different kinds of sheets together in the same welding under the same condition.Through this whole process, the hypothesis on the life cycle of lethargy coefficients was found to be ingood agreement with the result of the experiment. That is, when using sheets of the same materials inone welding, the fatigue life of two laps of a spot welded joint was found to be much superior byEZNCEN 5~14%, HS40R 17~30%,and when using each sheet of different materials, we found thedecrease in fatigue life by 6~16%. Finally, the best value from the data was chosen based on theexperiment for the analysis of the fatigue life of each layer
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.151.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Characterization of Creep Resistance for Local Structure of Power Plant Weldment Using SP-Creep Technique (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 326-328 (Dec. 2006), p. 643-648 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Power plant weldments are composed of various microstructures. Due to welding andPWHT processes, the microstructure of the base metal adjacent to fusion line is transformed intoentirely different microstructures, collectively known as heat affected zone (HAZ). Creep, on theother hand, is considered as the most important deterioration mechanism of heat resistantcomponents found in power plants. Therefore it is essential to evaluate creep properties of HAZ,which is considered to be very hazardous in weldment. Recently, most of the creep tests for HAZare conducted using cross weld type specimen. However there are some problems with this type ofcreep test due to the results being largely varied according to the volume fraction of HAZ. In thispaper, SP-Creep test, which has confirmed the availability for creep properties evaluation, has beenconducted on each of the weldment microstructures. The results showed that each microstructurehas a different creep behavior. The overall creep properties of HAZ are worse than those of theweld metal. Among the HAZ structures, fine grained HAZ has the worst creep properties
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.643.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Identification of Load Applying on T-Shape Joint with Inverse Problem (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 326-328 (Dec. 2006), p. 657-660 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In the beginning of design, exact load data are actually necessary for the fatigue strengthand life analysis to minimize the cost and time of designing. The procedure of practical loaddetermination is developed by the combination of the principal stresses of F.E.Analysis andexperiment. This paper conceives new procedure for the determination of load direction andmagnitude applied on mechanical structures. New procedure is the combination of the analyticaland empirical method with analyzed strain by F.E. Analysis under unit load and with measuredprincipal stress by strain gages under driving load, respectively. In this paper, we theorize theprocedure of practical load determination and make the validity and the practicality of the procedurewith the application to T-shape jointed structure. F.E. Analysis is conducted to get the principalstress on arbitrary points in the F.E. model of T-shape joint under unit load. Then experiment iscarried out to get the principal stress on the same points of F.E. model. To demonstrate the actualdriving condition, the load conditions are bending and torsion. From these two data sets, themagnitude, the direction and the position of load can be obtained
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.657.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Assessment of stress corrosion cracking susceptibility by a small punch test (1999)
    Oxford, UK : Blackwell Science Ltd
    Fatigue & fracture of engineering materials & structures 22 (1999), S. 0 
    Details
    ISSN: 1460-2695
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The object of this study is to establish a new test method for evaluating stress corrosion cracking (SCC) susceptibility of high-strength steel using a small punch (SP) test and acoustic emission (AE). A miniaturized specimen (10 × 10 × 0.5 mm) is adopted for SCC evaluation. The experiments are conducted at various loading rates and at various orientations of the specimen. The cumulative average amplitude of the AE signal per unit equivalent fracture strain (εqf ) increases as the SCC susceptibility increases. Through the load–displacement behaviour, the fracture energy (ESP ), the SEM fractographs, and the correlation between the SCC susceptibility and the AE characteristics, it is proved that the small punch test method combined with AE measurements is a useful method to evaluate the SCC susceptibility of high-strength steel.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1460-2695.1999.00218.x
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  • 6
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    Assessment of stress corrosion cracking susceptibility by a small punch test (1999)
    Springer
    Details
    Publication Date: 1999-10-01
    Print ISSN: 0376-9429
    Electronic ISSN: 1573-2673
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 7
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    Creep Properties Assessment by Shear Punch Creep Test and IMC Morphology of Aged Pb-Free Solder Joint/UBM (2019)
    Molecular Diversity Preservation International
    Details
    Publication Date: 2019-02-11
    Description: In this paper, we investigated the intermetallic compound (IMC) morphology of aged (0, 200, 600 h) conventional Sn-37Pb and Pb-free Sn-4Ag-0.5Cu solder joints/(Ni-P/Au) UBM; the creep properties of the solder joints were evaluated using a shear punch creep test (SPCT) method. The creep displacement-time curves of the solder joints exhibited different behaviors depending on stress application and aging treatment conditions. Empirical formulas such as the Power-law and Monkman-Grant relationship have been used to analyze the SPCT data. Furthermore, the IMC behavior of solder joints was investigated using energy-dispersive X-ray spectroscopy (EDS) and a scanning electron microscope (SEM). The result showed that with an increase of the aging time, the stress exponents (n) of solder joints were decreased, but the IMC thickness and size were increased. In most of the experimental conditions, the creep properties of Pb-free solder joints were superior to the conventional Sn-37Pb solder joints.
    Electronic ISSN: 2075-4701
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Molecular Diversity Preservation International
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