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  • 1
    Electronic Resource
    Electronic Resource
    Fatigue Strength Evaluation of Load-Carrying Fillet Weldments under Out-of-Plane Bending Load Using Structural Stress Method (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 2069-2072 
    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: Two types of load carrying fillet weldment, which are typical weld joints in ship structures, wereexamined under out-of-plane bending load by using structural stress approach. Finite element analyses usingboth solid and shell elements models have been performed for the assessment of fatigue strength. Basis forthe derivation of structural stress method is discussed in detail. The calculated structural stress values for thefatigue strength evaluation of load carrying fillet weldments are independent of mesh size. In this study,drawbacks and doubts associated with applying the structural method such as the guidance of virtual nodemethod and the application of three-dimensional equilibrium condition for solid model have been discussedaccompanied by various case studies. In order to solve the problem of the solid model, the alternative methodfor solid model by using the equilibrium condition of the nodal force has been introduced
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.2069.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Design of Electrical Panels of Naval Vessels for Improved Fatigue, Shock and Vibration Performance (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 26-28 (Oct. 2007), p. 1235-1238 
    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: Structural reliability of electrical panels installed in naval vessels is of criticalimportance from the structural performance viewpoint. The electrical panels may beexposed to vibration and fatigue loadings from internal and external sources as well aswave loadings that result into fatigue crack and fracture due to the decrease of fatiguestrength. In this regard, electrical outfitting equipments on naval vessels are required tocomply with capabilities against vibration and shock tests, normally tested according toMilitary Standard. This study introduces the effect of post welding treatment, such astoe grinding as well as post welding heat treatment (PWHT), are examined through aseries of fatigue and impact tests according to military standards. On the other hand, theuse of elastic mounts that are capable of isolating and mitigating shock and vibrationtoward electrical panels are investigated. Both experimental and numerical results arepresented based on the analysis according to military standards
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.26-28.1235.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of Residual Stress on the Mechanical Capacity of Layered Composite (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 1803-1806 
    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: For enhanced mechanical properties of ceramics for structural application, a great deal ofattention has concentrated on preparation of layered composites. In this study, numerical simulationtechnique, which is applicable for the evaluation of mechanical performance for layered compositematerial, was developed. A generalized material constitutive equation coupled with material damagemodel based on the continuum damage mechanics approach was proposed and has been implementedto an in-house type finite element analysis code. The material behaviors for each component oflayered composites can be simulated by the pre-defined material model on the simulation. A series offinite element analyses was carried out in order to elucidate the effect of fabrication related residualstress on the structural capacity of the layered composites
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.1803.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Simultaneous Health Monitoring and Vibration Control of Structures Using Smart Materials (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 297-300 (Nov. 2005), p. 2207-2212 
    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: Large welded structures, including ships and offshore structures, are normally in operation under cyclic fatigue loadings. These structures include many geometric as well as material discontinuities due to weld joints, and the fatigue strength at these hot spots is very important for the structural performance. In the past, various Non-Destructive Evaluation (NDE) techniques have been developed to detect fatigue cracks and to estimate their location and size. However, an important limitation of most of the existing NDE methods is that they are off-line; the normal operation of the structure has to be interrupted and the device often has to be disassembled. In this study, a new impedance-based structural health monitoring system employing piezoceramic transducers is developed with a special interest in applying the technique for welded structural members in ship and offshore structures. In particular, the impedance-based structural health monitoring technique that employs the coupling effect of piezoceramic (PZT) materials and structures is investigated
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.297-300.2207.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    A Study for the Fatigue Failure Mode Assessment of Fillet Weldments (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 580-582 (June 2008), p. 601-604 
    Details
    ISSN: 1662-9752
    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 this study, a methodology for the assessment of fatigue failure modes of weldments dueto partial penetration weld has been carried out by using structural stress method. Structural stresscalculation procedure, using shell element based on equilibrium consideration using nodal forces andmoments, is employed. It is important to note that the structural stress calculation procedures forpartial penetration welds can be used to determine a minimum weld leg length, beyond which, weldroot failure modes can be effectively suppressed. An example study, with respect to a fillet weld leglength design, is compared with a design criterion, and they are found to be in agreement
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.580-582.601.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Fatigue Damage Model for Numerical Assessment of Fatigue Characteristics (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 580-582 (June 2008), p. 663-666 
    Details
    ISSN: 1662-9752
    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 aim of this study is the development of a numerical technique applicable for thefatigue assessment based on the damage mechanics approach. The generalized elasto-visco-plasticconstitutive equation, which can consider the internal damage evolution behavior, is developed inorder to numerically evaluate the material fatigue responses. Explicit information of therelationships between the mechanical properties and material constants, which are required for themechanical constitutive and damage evolution equations, are derived. The performance of thedeveloped technique has been verified using the S-N relationship assessment for STS304 stainlesssteel
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.580-582.663.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Development of Damage Assessment Method for Steel Structures Using Material-Structure Coupling Analysis (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 297-300 (Nov. 2005), p. 122-127 
    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: Once assessment of material failure characteristics is captured precisely in a unified way, it can be directly incorporated to the structural failure assessment under various loading environments, based on the theoretical backgrounds so called Local Approach to Fracture. The aim of this study is the development of an expert system applicable for the assessment of structural integrity throughoutcrack initiation and structural failure based on the Local Approach to Fracture. The generalized elasto-visco-plastic constitutive equation, which can consider the internal damage evolution behavior, was developed and employed in the 3-D FEA code in order to numerically evaluate the material and/or structural responses. Explicit information of the relationships between the mechanical properties and material constants, which are required for the mechanical constitutive and damageevolution equations for each material, was implemented in an automatic system using genetic algorithm based on an inference system. The material constants selected from genetic search and constitutive equations are used directly in the failure assessment of material and/or structures. The performance of the developed system has been evaluated for the S-N relationship assessment of several materials as well as the crack initiation assessment of various weldments in steel structures
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.297-300.122.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Damage Mechanics Implementation of Material Design Simulator for Layered Ceramic Composites (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 1083-1086 
    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 objective of this study is to establish a numerical technique applicable for theassessment of damage characteristics of laminate ceramic. A numerical simulator, which can be usedfor the optimal material design, was developed based on the damage mechanics approach. To evaluatethe internal damage evolution behavior within composite material, generalized damage evolutionequation was developed and implemented in way of finite element method. By virtue of an automaticdata interface between the commercial FEA results and damage calculation, a simple andcost-effective damage evaluation system is constructed. It was found that the developed system can beused for the evaluation of the material performance of composite
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.1083.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Impact Strength Assessment of LNG Carrier Insulation System (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 326-328 (Dec. 2006), p. 1527-1530 
    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 aim of present paper is to experimentally investigate the dynamic strengthcharacteristics of LNG cargo containment system under impact loads. A series of impact tests forfull-scale MARK III insulation system is undertaken using a custom-built drop test facility asvarying height and weight of the drop object. Based on a series of repeated drop tests, displacementrecovery was measured for the assessment of damping characteristic of insulation system. Crackinitiation was also measured during the cyclic drop test. The quantitative relationship betweenimpact load and crack initiation as well as the crack propagation with respect to drop number arederived
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.1527.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Evaluation of Fatigue Strength Improvement of Ship Structural Details by Weld Toe Grinding (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 1079-1082 
    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 order to strengthen or repair the welded structural members or fatigue damaged areas,various surface treatment methods such as grinding, shot peening and/or hammer peening arecommonly employed among other methods available. While the weld toe grinding method is knownto give 3~4 times of fatigue strength improvement, this improvement may significantly varyaccording to weld bead shapes and loading modes. In this context, a series of fatigue tests is carriedout for three types of test specimens that are typically found in ship structures. Weld burr grinding iscarried out using an electric grinder in order to remove surface defects and improve weld beadprofiles. The test results are compared with the same type of test specimen without applying thefatigue improvement technique in order to obtain a quantitative measure of the fatigue strengthimprovement. Moreover, structural stress method is employed to evaluate the effectiveness of themethod in evaluating the fatigue strength improvement of welded structures
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.1079.pdf
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