Investigation on the influence of material interfaces and impedance changes on the propagation of guided waves in laminated steel layers

Rittmeier, Liv; Losch, Tobias; Sinapius, Michael; Lammering, Rolf

doi:10.1016/j.promfg.2018.06.039

Cited by 8 publications

(6 citation statements)

References 12 publications

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“…Mouritz, 2007). Additionally, composite materials with enhanced delamination toughness such as GLARE are of scientific interest (see Rittmeier et al, 2018). The most common design of UAV structure is semi-monocoque (single shell) which implies that the respective skin is stressed and thus needs to be reinforced.…”

Section: Drone Construction Materials Requirementsmentioning

confidence: 99%

“…Although there are substantial contributions to prevent structural elements from delamination, this problem is not yet solved. Promising approaches to increase delamination toughness can be found in the literature (e.g., Mouritz, 2007;Rittmeier et al, 2018). However, by suggesting magnesium based construction materials for e.g., quadcopter drones, the authors believe that the potential problem of delamination can be circumvented.…”

Section: Drone Construction Materials Requirementsmentioning

confidence: 99%

“…The use of magnesium in the aircraft industry has been an important topic since the beginning of aircraft construction. Even before the Second World War, a large number of magnesium parts were used in aircraft construction, including propellers and sheet metal for the outer skin (Reed, 1925;Beck, 1939;Hallion, 2017). During the Second World War, however, a great amount of magnesium was used to build aircrafts in Germany.…”

Section: The Magnesium Based Urbane Aviation Vehicle-designmentioning

confidence: 99%

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Novel Magnesium Based Materials: Are They Reliable Drone Construction Materials? A Mini Review

et al. 2021

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Novel magnesium-based materials are ideal candidates for use in future aviation vehicles because they are extremely light and can therefore significantly increase the range of these vehicles. They show very good castability, are easy to machine and can be shaped into profiles or forgings to be used as components for next generation aerial vehicle construction. In the case of a large number of identical components, high-pressure die casting of magnesium alloys is clearly superior to high-pressure die casting of aluminum alloys. This is due to the lower solubility of iron in magnesium and thus tool/casting life is significantly longer. In addition, the die filling times for magnesium high-pressure die casting are approximately 30% shorter. This is due to the lower density: aluminum alloys are approximately 50% heavier than magnesium alloys, which is a significant disadvantage for aluminum alloys especially in the aerospace industry. There are cost-effective novel die casting alloys, besides AZ91 or AM50/60 such as DieMag633 or MRI230D, which show very good specific strength at room and elevated temperatures. In the case of magnesium-based wrought alloys, the choice is smaller, a typical representative of these materials is AZ31, but some new alloys based on Mg-Zn-Ca are currently being developed which show improved formability. However, magnesium alloys are susceptible to environmental influences, which can be eliminated by suitable coatings. Novel corrosion protection concepts for classical aerial vehicles currently under development might suitable but may need adaption to the construction constraints or to vehicle dependent exposure scenarios. Within this mini-review a paradigm change due to utilization of new magnesium materials as drone construction material is briefly introduced and future fields of applications within next-generation aerial vehicles, manned or unmanned, are discussed. Possible research topics will be addressed.

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Section: Drone Construction Materials Requirementsmentioning

confidence: 99%

Section: Drone Construction Materials Requirementsmentioning

confidence: 99%

Section: The Magnesium Based Urbane Aviation Vehicle-designmentioning

confidence: 99%

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Novel Magnesium Based Materials: Are They Reliable Drone Construction Materials? A Mini Review

et al. 2021

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“…In contrast to homogenous materials such as metals or CFRP, the high difference in acoustic impedance between the layers of FML, e.g., glass fiber and aluminum layers for GLARE, is expected to have an impact on the wave propagation [3].…”

Section: Introductionmentioning

confidence: 99%

Micro-Oscillator as Integrable Sensor for Structure-Borne Ultrasound

Haus

Rittmeier

Roloff

et al. 2021

The 8th International Electronic Conference on Sensors and Applications

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Motivated by their functional conformity, micro-cantilever-based MEMS oscillators are investigated in this study as structure-integrable transducers for the acquisition of guided ultrasonic waves in fiber–metal laminates. While acceleration-sensitive oscillators are limited in their maximum frequency, the presented displacement-sensitive oscillator is operated quasi-free in the fashion of a seismometer, making it particularly sensitive for high-frequency displacements above the sensor’s resonance frequency. The potential of this non-traditional application of a seismometer for the acquisition of structure-borne ultrasound is demonstrated experimentally. Therefore, MEMS oscillators are formed from the membrane of established pressure sensors by femtosecond laser micro-machining and mounted onto a setup for stimulation by structure-borne ultrasound. Experimental results indicate the targeted proportionality of the high-frequency stimulus and the sensor response. In conclusion, MEMS oscillators enable acquisition of high-frequency displacements and could therefore serve as structure-integrable sensors for guided ultrasonic waves.

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“…The investigation of this subject follows as forward and inverse problem analysis. Based on an already existing 2D model [2] a 3D finite element model is developed using COMSOL Multiphysics® Software involving the excitation of waves and observing its propagation in the structure. One crucial aspect here is the model discretization and hence, the corresponding element size.…”

mentioning

confidence: 99%

Numerical Analisys of Guided Ultrasonic Wave Propagation in Fiber Metal Laminates

Mikhaylenko¹,

Bellam-Muralidhar²,

Rauter³

et al. 2021

VIII Conference on Mechanical Response of Composites

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Investigation on the influence of material interfaces and impedance changes on the propagation of guided waves in laminated steel layers

Cited by 8 publications

References 12 publications

Novel Magnesium Based Materials: Are They Reliable Drone Construction Materials? A Mini Review

Novel Magnesium Based Materials: Are They Reliable Drone Construction Materials? A Mini Review

Micro-Oscillator as Integrable Sensor for Structure-Borne Ultrasound

Numerical Analisys of Guided Ultrasonic Wave Propagation in Fiber Metal Laminates

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