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  • 1
    Digitale Medien
    Digitale Medien
    Extending Endurance for the Friction Coefficient Development of Automobile Wiper Blade (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 345-346 (Aug. 2007), p. 1381-1384 
    Details
    ISSN: 1013-9826
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: Wiper blade is one of inexpensive automotive components, but the component is veryimportant part considering car safety for securing automotive visual field. Therefore study forsecuring longer endurance of wiper blade was proceeding, that is about variables effecting onendurance. In this paper, it was proved that the effect to extend endurance could be acquired bysecuring proper friction coefficient. Be compared endurance in Weibull distribution that is reliabilitytechnique and seized effect about blade pressure distribution, contact pressure, blade rubber surfacetreatment etc. for securing proper friction coefficient. Relation between these variables was clearedthrough test. Also, designed and proposed tester for measuring friction coefficient of wiper blade
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.345-346.1381.pdf
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  • 2
    Digitale Medien
    Digitale Medien
    Fatigue Life Evaluation for a Reaping Knife of Combine (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 297-300 (Nov. 2005), p. 28-33 
    Details
    ISSN: 1013-9826
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: The Combine is necessary equipment in the agricultural industry. The components of the Combine are worked for a long time under inferior environmental condition. Especially reaping knife is worked in high frequency domain, and submit fatigue load while use. So, fatigue test was performed to obtain the S-N curve of real component, and load history is measured through field test. The local stresses due to these loads have been calculated by FEM. These results have been used as the input values for the multi-axial fatigue analysis of real components. For the assessment ofmulti-axial fatigue damage, the critical plane methods have been employed. The used parameters of critical plane methods are Morrow’s, Smith-Waston-Topper’s, and Brown-Miller’s, those were modified for the high cycle fatigue region within elastic behavior. In addition, design improvement is performed about shape of reaping knife to increase the endurance limit, and durability test forimproved knife is performed. It is found that the fatigue life of improved reaping knife is increased, and durability test result show that life of reaping knife is increased enough
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.297-300.28.pdf
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  • 3
    Digitale Medien
    Digitale Medien
    Effect of Semi Austempering Treatment on the Fatigue Properties of Ductile Cast Iron (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 345-346 (Aug. 2007), p. 295-298 
    Details
    ISSN: 1013-9826
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: Single phase bainite structure which is obtained by the conventional austemperingtreatment reduces the ductility of ductile cast iron. Because of the reduction of ductility it is possibleto worsen the fatigue properties. Therefore, semi austempered ductile iron which is treated from [removed info] +ϒis prepared to investigate the static strength and fatigue properties in comparison with fullyaustempered ductile iron (is treated from ϒ). In spite of semi austempered ductile iron shows the 86%increase of ductility. Also, semi austempered ductile iron shows the higher fatigue limit and lowerfatigue crack growth rate as compared with fully austempered ductile iron. By the fractographicalanalysis, it is revealed that the ferrite obtained by semi austempering process brings about the plasticdeformation(ductile striation) of crack tip and gives the prior path of crack propagation. Therelatively low crack growth rate in semi austempered specimen is caused by above fractographicalreasons
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.345-346.295.pdf
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  • 4
    Digitale Medien
    Digitale Medien
    Dynamic Fracture Analysis of Aluminum Honeycomb Sandwich Panel (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 306-308 (Mar. 2006), p. 67-72 
    Details
    ISSN: 1013-9826
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: Impact behaviors of Aluminum Honeycombs Sandwich Panel (AHSP) by drop weight test were investigated in this study. Two types of specimens with l/2" and l/4" cell size were tested by two impactors with the weight of 5.25kgf and 11.9kgf respectively. Transient, contact and elastic-plastic analyses were performed by finite element method. Impact behavior of AHSP about impact sites appeared nearly the same in low impact energy, but it was different in high impact energy. Face was the strongest about impact and short-edge was the weakest. The damaged area of AHSP was enlarged with the increase of impactor weight that is corresponding to impact energy. After 3-point bending test, fracture modes of AHSP were analyzed with AE counts, lower face sheet was fractured in the long-edge direction first, and then separation between face sheet and core happened. In the short-edge directionafter core wrinkled, lower face sheet was torn, impact behavior by FE analysis were increased localized damage in high velocity because the faster velocity of the impact was, the smaller the stress of core was. Consequently, impactor weight had an effect on widely damaged area, while the impact velocity gave rise to localized damaged area
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.306-308.67.pdf
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  • 5
    Digitale Medien
    Digitale Medien
    Fatigue Life Evaluation of Vehicle Wheel Bolts under Random Loading (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 297-300 (Nov. 2005), p. 1770-1775 
    Details
    ISSN: 1013-9826
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: The fatigue life of hexagon head and socket head bolts, attached to vehicle a wheel, is assessed and the estimation of the residual life of existing bolts in vehicle wheel is investigated. Field- measured load histories were applied in this test. Tensile tests and fatigue tests were performed to evaluate the effect of tightening torque and to obtain the basic experimental data. A three-dimensional finite element analysis was also performed to evaluate the local stress fields. Miner’s rule was used to predict the fatigue life of bolts. The results indicate the prediction of fatigue life of the bolts was in good agreement with the real life of vehicle wheel bolts in this test
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.297-300.1770.pdf
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  • 6
    Digitale Medien
    Digitale Medien
    Fatigue Life Evaluation for Notched Components of Automatic Transfer Devices (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 1269-1272 
    Details
    ISSN: 1013-9826
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: In this study, the fatigue life evaluation of automatic transfer devices under stressconcentrations due to the notch effect is performed. To investigate residual life of a notchedcomponent, load histories were obtained through strain measurement. A fatigue test was performedon a specimen imitating a real component and results were compared with each notch root radius ofthe concentration area. Three-dimensional finite element analysis was also performed to evaluate thelocal stress fields. Miner’s rule was used to predict the fatigue life calculation. As a result, thepredicted life of a notched component was in good agreement with a real component and introduced aspecial method for measuring load using real machine components
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.1269.pdf
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  • 7
    Digitale Medien
    Digitale Medien
    A Study on Load Analysis and Durability Test Condition of Automobile Brake Pedal (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 1273-1276 
    Details
    ISSN: 1013-9826
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: Automobile pedal which is loaded by driver’s input is transmitting load to throttle cable,braking device and clutch device and controlling automobile. Measuring working condition andapplying equivalent damage are needed for reliability of developing pedal. The measuring workingcondition is requiring more investigation with various respects because of widely ranged drivers, roadcondition and environmental condition. Additionally, when equivalent damage is applied, there arenot suitable for test condition if equivalent damage is too high level to apply or unused region. In thisstudy, load history is measured with 95percentile customer. Measured load history is converted tostress history about critical area of pedal by FEM. There are drawn up histogram of pedal cycles andload from stress history with rain flow cycle counting method, calculated relative damage of extendedstress history with Palmgren-Miner rule. From the results, calculated total relative damage is appliedto calculation method of test time and load. Calculation method for test condition is carried out withthree methods which are enforcing with total stress by rain flow cycle counting, representative loadand blocked load. Accelerated durability test condition of pedal using with relative damage andacceleration factors are proposed
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.1273.pdf
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  • 8
    Digitale Medien
    Digitale Medien
    Fatigue Life Evaluation of Bolt Having Tightening Torque under Random Loading (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 819-822 
    Details
    ISSN: 1013-9826
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: The fatigue life of hexagon head and socket head bolts, attached to vehicle a wheel, isassessed and the estimation of the residual life of existing bolts in vehicle wheel is investigated. Fieldmeasuredload histories were applied in this test. Tensile tests and fatigue tests were performed toevaluate the effect of tightening torque and to obtain the basic experimental data. Miner’s rule wasused to predict the fatigue life of bolts. The results indicate the prediction of fatigue life of the boltswas in good agreement with the real life of vehicle wheel bolts in this test
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.819.pdf
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  • 9
    Digitale Medien
    Digitale Medien
    Fatigue Life Prediction of High-Strength Bolt Subjecting to Torque (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 345-346 (Aug. 2007), p. 299-302 
    Details
    ISSN: 1013-9826
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: The effect of axial loading resulting from torque on the fatigue life of bolts has beeninvestigated. It was found that the fatigue limit of bolts increased by an amount proportional to theincrease in torque. There was a linear relationship between torque and fatigue limit. Using the Shigleymethod, the prediction of fatigue limit from calculated stress concentration factors was alsoexamined. A good correlation was found between the experimental and predicted fatigue limit. TheShigley method was appropriate for the prediction of fatigue life of bolts
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.345-346.299.pdf
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  • 10
    Digitale Medien
    Digitale Medien
    Effect of Nitriding on Fatigue Crack Initiation and Fatigue Crack Propagation Retardation in Ni-Cr-Mo Steel (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 345-346 (Aug. 2007), p. 291-294 
    Details
    ISSN: 1013-9826
    Quelle: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Thema: Maschinenbau
    Notizen: Effect of nitriding on fatigue crack initiation and growth rate has been studied on Ni-Cr-Mosteel. Specimens were nitrided for 15hr at 680℃. The fatigue limit of nitrided specimens weresuperior to those of annealed(680℃, 15 hr) specimens. Based on detailed observations of slip bandand micro crack initiation, it is concluded that the excellent fatigue limit of nitrided specimens isattributed to improved slip initiation resistance by nitriding. The characteristic of fatigue crack growthrate of nitrided specimens was investigated by comparing with those of annealed specimens. It wasfound that by nitriding the crack growth rate was markedly decreased and the threshold stress intensityfactor range was improved. It is concluded that the excellent fatigue limit of nitrided specimens isalso attributed to improved fatigue crack growth rate and threshold stress intensity factor range bynitriding
    Materialart: Digitale Medien
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.345-346.291.pdf
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