Effects of silver-based metal electroplate on fatigue properties of PZT ceramics

Okayasu, Mitsuhiro; Aoki, Satoshi; Mizuno, Mamoru

doi:10.1016/j.ijfatigue.2007.08.002

Cited by 33 publications

(24 citation statements)

References 23 publications

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“…In previous work, the effect of the Ag electrode on the fatigue properties of PZT was examined since the electrode materials are understood to play an important role in the mechanical properties of PZT ceramics. 4,5 It appeared that the electrode could make a reduction in the material strength of PZT. The reasons behind this are (i) microcracks generated from a porous region 3,5 and (ii) electrogeneration trapped at a defect.…”

Section: Introductionmentioning

confidence: 99%

“…4,5 It appeared that the electrode could make a reduction in the material strength of PZT. The reasons behind this are (i) microcracks generated from a porous region 3,5 and (ii) electrogeneration trapped at a defect. 6 Even though the influence of the electrode on the fatigue properties has been investigated for Ag-PZT samples, this examination has not been carried out for Ni-PZT samples.…”

Section: Introductionmentioning

confidence: 99%

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Fatigue failure characteristics of lead zirconate titanate piezoelectric ceramics

Okayasu

Ozeki

Mizuno

2010

Journal of the European Ceramic Society

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fatigue failure characteristics of lead zirconate titanate piezoelectric ceramics

Okayasu

Ozeki

Mizuno

2010

Journal of the European Ceramic Society

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“…The work of Okayasu et al (2008) shows that the silver electrode firing process results in Ag infiltrating the grain boundaries and the matrix of the PZT ceramic near the electrode layer. This lowers the hardness in this region to approximately 70% of that outside the zone (thought to be caused by the mechanism of "reduction in severity of grain bonding" ( (Okayasu et al, 2008), p1122)) reducing fracture toughness, making the ceramic more brittle.…”

Section: Piezoceramic Element Fracturementioning

confidence: 99%

Section: Piezoceramic Element Fracturementioning

confidence: 99%

“…This lowers the hardness in this region to approximately 70% of that outside the zone (thought to be caused by the mechanism of "reduction in severity of grain bonding" ( (Okayasu et al, 2008), p1122)) reducing fracture toughness, making the ceramic more brittle. This is evidenced by transgranular fracture in the zones showing Ag interspersed in the PZT ceramic matrix ( (Okayasu et al, 2008), pp.1119-1120) whereas outside of the Ag rich region the fracture characteristic is intergranular. As a result of the Ag infiltration the bending fatigue strength of Ag electroded PZT material loaded parallel to the electrode surface (perpendicular to the direction of poling) is (60 MPa) this is 1.2 times higher than the fatigue strength obtained for loading perpendicular to the electrode surface (parallel to the poling direction) ( (Okayasu et al, 2008), p1123).…”

Section: Piezoceramic Element Fracturementioning

confidence: 99%

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Investigation of the effects of structure-sensor interaction on piezoceramic transducers for structural health monitoring applications

Favier¹

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Surface bonded piezoceramic transducers used for structural health monitoring that are subjected to high strain loading are at risk of being compromised by damage to the attaching bond line or to the piezoceramic sensing element. In consequence, when baseline sensor data for a healthy structure is compared to subsequent data obtained from damaged sensors, incorrect assessment of the state of the structure may occur.This project investigated and developed a novel method of attaching piezoceramic transducers to specially prepared thermoset composite surfaces using functional thermoplastic surfaces as bond line media with the aim to improve the protection of the transducer from the damaging effects of high strain structural loading.To evaluate the effectiveness of this new approach, the fatigue performance of thermoplastic weld bonded and cyanoacrylate adhesive bonded transducers were compared.Finite element analysis (FEA) of transducer-bondline-structure models showed that strain transfer from the structure to the piezoceramic element reduced as bond layer thickness increased or as the bond layer modulus decreased. The simulations indicated that within each material layer shear strain changes gradually and the rate of change is different for each material type. At dissimilar material interface boundaries shear strain has a common value but the change gradient differences within each material mean the interface is a likely location for transducer failure.For cyanoacrylate and thermoplastic bonding systems the availability of published data regarding bond strength is limited. Static tensile testing was undertaken to generate some of the bond strength data for different bond layer thicknesses and a range of surface roughness. The data showed that tensile bond strength increased with decreasing adhesive layer thickness and that for the range of surface roughness tested the relative performance of each bond line thickness was similar.To further examine the performance of the two different bonding systems, fatigue testing was undertaken. The relative performance of each system was compared using transducer output voltage and impedance data. Specimens were fabricated by bonding 10 mm diameter, 1 mm thick silver electroded piezoceramic transducers to appropriately ii prepared thermoset composite test coupons. Test samples were subjected to sinusoidal loading at 5 Hz and maximum strains of 1000 µɛ, and 2000 µɛ or 3000 µɛ.For both bond types, sensor voltage output showed an initial period of rapid decrease in amplitude before typically settling at an approximate steady state output. The lower voltage output from the thermoplastic bonded transducers indicated that the thermoplastic bond lines reduced strain transfer between the host structure and the piezoceramic sensing element.The fatigue test results showed that polyvinylidene fluoride (PVDF) bonded transducers experienced a reduced or similar decrease in performance relative to the cyanoacrylate bonded transducers for the same number of load cycles and strain ran...

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Energy Harvesting

Boughey

Kar‐Narayan

2017

Magnetoelectric Polymer‐Based Composites

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Effects of silver-based metal electroplate on fatigue properties of PZT ceramics

Cited by 33 publications

References 23 publications

Fatigue failure characteristics of lead zirconate titanate piezoelectric ceramics

Fatigue failure characteristics of lead zirconate titanate piezoelectric ceramics

Investigation of the effects of structure-sensor interaction on piezoceramic transducers for structural health monitoring applications

Energy Harvesting

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