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Vibro-acoustic analysis of post-impacted sandwich panels

Yetmez M. | Kocer L. | Erdogan H. | Demirci I.

Conference Object | 2015 | Materialwissenschaft und Werkstofftechnik46 ( 04.May ) , pp.440 - 445

In this study, the vibro-acoustic behaviour of centrally damaged honeycomb cored sandwich panels is investigated experimentally. For this purpose, experimental evaluations are completed by the followings: (I) honeycomb sandwich panels with two different core materials and the same skin materials are considered, (II) low-velocity impact measurements with three different projectiles are obtained, (III) vibration and vibro-acoustic tests are performed to present the vibration characteristics of the post-impacted sandwich panels with two different boundary conditions. Effect of core material and projectile geometry on modal and sound ch . . .aracteristics is examined. The results are given in tabular and graphical forms. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Daha fazlası Daha az

Theoretical and experimental investigation of effects of failures on the tensile endurance of elevator ropes [Theoretische und experimentelle Untersuchung der Effekte von Fehlern auf die Dauerzugfestigkeit von Aufzugseilen]

Onur Y.A. | Aycan O.

Article | 2019 | Materialwissenschaft und Werkstofftechnik50 ( 6 ) , pp.706 - 717

Elevators have an important place in human life just after uprising demands in high rise buildings, skyscraper and luxury residence concepts have surged. Steel wire ropes provide permanent working safety and reliability in the elevator installations. Due to this reason steel wire ropes are one of the vital components of elevators. In this study, effects of discard criteria such as wire breaks, abrasive wear and corrosion where extents of those failures are defined by ISO 4344 standard on the tensile endurance of 6×19 Seale and 8×19 Warrington elevator ropes have been investigated theoretically and experimentally. Tensile endurances . . .of rope samples that have different extents of failure have been determined by using tensile testing machine and comparison is made by undamaged samples for each rope separately. In addition, stress and strain values occurred on the elevator ropes investigated have also been presented. The most critical failure type has been found to be 24 wire breaks for 6×19 Seale rope with fiber core where lifting capacity reduced by 25.99 %. The most critical failure type has been found to be abrasive wear which is 0.1 mm in depth along 100 mm length for 8×19 Warrington rope with independent wire rope core where lifting capacity reduced by 7.93 %. © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinhei Daha fazlası Daha az

Experimental dynamic analysis on naturally curved honeycomb sandwich beams with different damage patterns

Erdogan H. | Yetmez M.

Article | 2014 | Materialwissenschaft und Werkstofftechnik45 ( 4 ) , pp.306 - 313

In this study, dynamic analysis of naturally curved honeycomb sandwich beam including two surface cracks and an impact region at the facing skin is presented. Laminates of facing skin and backing skin are known as carbon fiber-plain weave composite laminates with 1.6 mm in thickness. In the first part, in order to determine mechanical properties of both the skin with no-crack/crack(s) and the honeycomb core of the composite beam, static tensile tests are conducted with respect to straingage measurement technique. In the second part, drop weight impact tests and vibration tests are performed to present the free vibration characterist . . .ics of the clamped-clamped honeycomb sandwich beam including cracks and an impact-damaged region. Corresponding to damage patterns of the sandwich beam, experimental dynamic analyses consist of six steps: (1) Vibration analysis with no-crack and no-impact region, (2) Vibration analysis with no-crack and an impact region, (3) Vibration analysis with a surface crack and no-impact region, (4) Vibration analysis with a surface crack and an impact region, (5) Vibration analysis with two surface cracks and no-impact region, (6) Vibration analysis with two surface cracks and an impact region. For these purposes, an impact hammer with a force transducer is used to excite the undamaged or damaged naturally curved honeycomb sandwich beam through the selected points. After the excitation, the responses are obtained by an accelerometer. Resonant frequencies for the modal responses of the naturally curved honeycomb sandwich beam with different damage patterns are discussed. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Daha fazlası Daha az

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