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Experimental characterization of piezoelectric transducers for automotive composite structural health monitoring

Politecnico di Torino-Massimiliana Carello, Alessandro Ferraris, Andrea Giancarlo Airale, Alessandro Messana, Lorenzo Sisca, Henrique de Carvalho Pinheiro, Simone Reitano
  • Technical Paper
  • 2020-01-0609
To be published on 2020-04-14 by SAE International in United States
Composite materials are a natural choice for engineering applications where mechanical performance and lightweight are required, as in state-of-the-art components in the automotive field. Nevertheless, close attention should be paid to defects present in this kind of structure. Several innovative ways to investigate the failure mode of structures in composite material has been developed in time. This paper presents the experimental characterization of piezoelectric transducers as a Structural Health Monitoring System: a continuous acquisition system of data in order to real time detect the presence of faults inside automotive components under analysis. Several tests have been executed over a PI-DuraAct piezoceramic patch coupled to a host structure, characterizing the acquisition and transmission of a signal. Contribution about bonding quality, shape wave distortion of imposed signal and best frequency for transmission have been evaluated. Furthermore, the damage was created in a controlled drop-dart tower and its intensity analyzed with a C-scan non-destructive test. An algorithm has been then implemented in MATLAB to obtain detection of defects and their intensity, by processing the data acquired. Two case…
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Aluminum Alloy, Hand Forgings and Rolled Rings 6.3Cu - 0.30Mn - 0.18Zr - 0.10V - 0.06Ti (2219-T852/T851) Solution Heat Treated, Mechanically Stress Relieved, and Precipitation Heat Treated

AMS D Nonferrous Alloys Committee
  • Aerospace Material Specification
  • AMS4144G
  • Current
Published 2020-02-18 by SAE International in United States
This specification covers an aluminum alloy in the form of hand forgings 17 inches (432 mm) and under in nominal thickness, and rolled rings up to 6 inches, incl (152 mm, incl) in nominal thickness at the time of heat treatment (see 8.5).
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Aluminum Alloy, Extruded Rod, Bar and Profiles (7055-T74511) 8.0Zn - 2.3Cu - 2.0Mg - 0.16Zr Solution Heat Treated, Stress-Relieved, and Overaged

AMS D Nonferrous Alloys Committee
  • Aerospace Material Specification
  • AMS4324B
  • Current
Published 2020-02-10 by SAE International in United States
This specification covers an aluminum alloy in the form of extruded bars, rods, and profiles (shapes) produced with a cross sectional area of 24 square inches (155 square centimeters) maximum and a circumscribing circle (see 8.3) diameter (circle size) of 10.5 inches (267 mm) maximum, with a nominal thickness up to 3.000 inch (76.20 mm), inclusive (see 8.6).
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Minimization of High Temperature Oxidation, Aluminum Alloy Heat Treatment

AMS D Nonferrous Alloys Committee
  • Aerospace Standard
  • ARP7500
  • Current
Published 2020-02-05 by SAE International in United States
This recommended practice provides recommendations for minimizing high temperature oxidation (HTO) during the heat treatment of aluminum alloy products and parts. HTO leads to deterioration of properties.
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Titanium Alloy, Round Bar and Wire 3Al - 8V - 6Cr - 4Mo - 4Zr Consumable Electrode Melted Solution Heat Treated and Cold Drawn

AMS G Titanium and Refractory Metals Committee
  • Aerospace Material Specification
  • AMS4957G
  • Current
Published 2020-01-14 by SAE International in United States
This specification covers a titanium alloy in the form of round bar and wire, 0.625 inch (15.88 mm) and under in nominal diameter or thickness.
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Dynamic Mechanical Strain-Induced Temperature Gradient Coating

  • Magazine Article
  • TBMG-35811
Published 2020-01-01 by Tech Briefs Media Group in United States

Evaluating components for discontinuities without damaging the part or system remains a priority for diverse industries and research fields. Low-cost techniques such as fluorescent penetrant inspection (FPI) are used widely by major industries, such as aviation and aerospace, despite limited defect detection and the need for complex, multi-step operations in highly controlled conditions. Nondestructive methods such as sonic infrared (SIR) testing apply ultrasound waves to identify surface defects and cracks. These techniques hold promise for widespread use but stand to improve in the detection of false positives.

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Marking of Electrical Insulating Materials

AE-8A Elec Wiring and Fiber Optic Interconnect Sys Install
  • Aerospace Standard
  • AS5942
  • Current
Published 2019-12-27 by SAE International in United States
This specification establishes the performance requirements for the identification of wire and cable by indirect markings that have been applied to electrical insulating materials including heat shrink sleeving, wrap around labels and “tie-on” tags as well as any other types of materials used for indirect marking. This specification covers the processes used to mark these materials, including impact ink marking, thermal transfer, hot stamp, and lasers, etc. This specification does not cover the direct marking on insulated electrical wires and cables.
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Tips for Reducing Error When Using Eddy Current Measuring Techniques

Aerospace & Defense Technology: December 2019

  • Magazine Article
  • 19AERP12_02
Published 2019-12-01 by SAE International in United States

Inductive eddy current technology is an extremely versatile non-contact method for measuring an object's position, distance, or vibration. Unaffected by environmental contaminants or target finish characteristics, these sensors can operate in a vacuum or in fluids, so they work well for dirty applications, like those with oil or dust present. To get the most out of eddy current sensors, follow these tips for reducing errors that can affect a measurement's accuracy.

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Sensing Applied Load and Damage Effects in Composites with Nondestructive Techniques

Aerospace & Defense Technology: December 2019

  • Magazine Article
  • 19AERP12_08
Published 2019-12-01 by SAE International in United States

Comparing and correlating piezoelectrically induced guided waves, acoustic emission, thermography, and X-ray imaging to determine the effects of applied load on a composite structure.

Composite materials are desirable for aeronautical and aerospace applications for many reasons including their high strength-to-weight ratios, fatigue and corrosion resistance, design adaptability, and performance capabilities in harsh environments. Because of these qualities, composites are useful in many applications such as in armor, helmets, and helicopters, and as structural components.

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Sensing Applied Load and Damage Effects in Composites with Nondestructive Techniques

  • Magazine Article
  • TBMG-35672
Published 2019-12-01 by Tech Briefs Media Group in United States

Composite materials are desirable for aeronautical and aerospace applications for many reasons including their high strength-to-weight ratios, fatigue and corrosion resistance, design adaptability, and performance capabilities in harsh environments. Because of these qualities, composites are useful in many applications such as in armor, helmets, and helicopters, and as structural components.