Fatigue failure characteristics of lead zirconate titanate piezoelectric ceramics

Okayasu, Mitsuhiro; Ozeki, Go; Mizuno, Mamoru

doi:10.1016/j.jeurceramsoc.2009.09.014

Cited by 55 publications

(53 citation statements)

References 27 publications

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“…The tailor made properties in piezocomposites enable us to use them in bio-medical transducers, underwater applications, micro positioning systems and vibration suppression, 16 wherein these materials are subjected to high loading conditions, 17 Though 1-3 piezocomposites are already used in many industrial applications, it is necessary to understand its reliability. 18 The reliability study in 1-3 piezocomposites is more complex since the interaction of passive polymer and active PZT comes into account. 19 In the literature, studies about 1-3 piezocomposites are focused on the variation of material properties as function of volume fraction of PZT fiber and to identify the effective material properties and influence of fiber orientation using analytical approach.…”

Section: Introductionmentioning

confidence: 99%

Experimental and theoretical investigation of temperature-dependent electrical fatigue studies on 1-3 type piezocomposites

Mohan

Arockiarajan

2016

AIP Advances

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1-3 type piezocomposites are very attractive materials for transducers and biomedical application, due to its high electromechanical coupling effects. Reliability study on 1-3 piezocomposites subjected to cyclic loading condition in transducer application is one of the primary concern. Hence, this study focuses on 1-3 piezocomposites for various PZT5A1 fiber volume fraction subjected to electrical fatigue loading up-to 106 cycles and at various elevated temperature. Initially experiments are performed on 1-3 piezocomposites, in order to understand the degradation phenomena due to various range in amplitude of electric fields (unipolar & bipolar), frequency of applied electric field and for various ambient temperature. Performing experiments for high cycle fatigue and for different fiber volume fraction of PZT5A1 is a time consuming process. Hence, a simplified macroscopic uni-axial model based on physical mechanisms of domain switching and continuum damage mechanics has been developed to predict the non-linear fatigue behaviour of 1-3 piezocomposites for temperature dependent electrical fatigue loading conditions. In this model, damage effects namely domain pinning, frozen domains and micro cracks, are considered as a damage variable (ω). Remnant variables and material properties are considered as a function of internal damage variable and the growth of the damage is derived empirically based on the experimental observation to predict the macroscopic changes in the properties. The measured material properties and dielectric hysteresis (electric displacement vs. electric field) as well as butterfly curves (longitudinal strain vs. electric field) are compared with the simulated results. It is observed that variation in amplitude of bipolar electric field and temperature has a strong influence on the response of 1-3 piezocomposites.

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Section: Introductionmentioning

confidence: 99%

Experimental and theoretical investigation of temperature-dependent electrical fatigue studies on 1-3 type piezocomposites

Mohan

Arockiarajan

2016

AIP Advances

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“…This "anisotropy of fracture toughness and electric field induced fatigue crack growth in polarized piezoceramics affect significantly the service performance of actuators and sensors" ( , p1). Indentation tests show that the behaviour results in cracks lengths that are approximately 1.8 times longer perpendicular to poling compared to those in the parallel orientation ( (Okayasu et al, 2010a), p722). Cracks growing perpendicular to the poling direction propagate along domain boundaries whilst cracks parallel to the poling direction propagate along grain boundaries which have a higher crack resistance ( (Okayasu et al, 2010a), p723).…”

Section: Piezoceramic Element Fracturementioning

confidence: 99%

“…Indentation tests show that the behaviour results in cracks lengths that are approximately 1.8 times longer perpendicular to poling compared to those in the parallel orientation ( (Okayasu et al, 2010a), p722). Cracks growing perpendicular to the poling direction propagate along domain boundaries whilst cracks parallel to the poling direction propagate along grain boundaries which have a higher crack resistance ( (Okayasu et al, 2010a), p723). For a surface bonded PZT transducer where the direction of poling is perpendicular to the host surface and in-plane loading occurs the higher fracture toughness in the poling direction will slow the growth of cracks through the thickness of the element.…”

Section: Piezoceramic Element Fracturementioning

confidence: 99%

“…The application of cyclic bending loads produces an increase in material hardness ( (Okayasu et al, 2010a), p718). Tensile and compressive loading produces realignment of domains within grains, the resulting anisotropic crystal orientation produces high internal and external stress, non-symmetrical deformation and non-linear material hardening ( (Okayasu et al, 2010a), p721).…”

Section: Piezoceramic Element Fracturementioning

confidence: 99%

“…Okayasu et al (2010a), (p717) shows that electroplated nickel (Ni) electrodes have an endurance limit (60 MPa) that is approximately 1.2 times higher than that of a PZT ceramic with sintered silver (Ag) electrodes when loaded perpendicular to the electrode surface. The cause of this difference remains unclear but it is thought that the Ag electroded PZT may have poorer mechanical properties, possibly caused by microcracks generated in porous regions and electrogeneration trapped at defects (which changes the electric domain orientation) ( (Okayasu et al, 2010a), p713).…”

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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High Volume Production of PZT Fiber Arrays for Direct Functional Integration into Metal Structures

et al. 2018

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A new concept for electromechanical coupling of piezoceramic to metal structures is enabled with the technology of joining by forming. This approach allows for the manufacturing of so‐called piezo‐metal modules. To make the manufacturing process ready for series production, it is necessary to fabricate lead zirconate titanate (PZT) fiber arrays with high geometric accuracy. In addition, the aim is to design the PZT fiber arrays so that they are usable with either piezoelectric transversal, longitudinal, or shear mode to enable different application options. In particular, the realization of the shear mode offers new application potentials in comparison to commercially available products. This paper presents both, a high volume production method, and the specific order for the production steps of PZT fiber arrays to achieve the different piezoelectric modes. In particular, the usable piezoelectric effects are determined by the order of the coatings of electrode and insulating layers as well as the direction of the polarization. Experimentally produced samples are tested in functional tests before and after the joining by forming process. The results verify the proof of the production method of PZT fiber arrays with a high accuracy. Furthermore, structurally integrated PZT fiber arrays demonstrate the functional use of the three piezoelectric modes in the plane of an aluminum sheet. Fabricated piezo‐metal modules with transversal mode and shear mode are successfully verified in sensory function. The longitudinal mode is tested in actuator function. During the tests, failures for the insulation layer are identified. These can be eliminated with a modified manufacturing process, which is proposed.

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Fatigue failure characteristics of lead zirconate titanate piezoelectric ceramics

Cited by 55 publications

References 27 publications

Experimental and theoretical investigation of temperature-dependent electrical fatigue studies on 1-3 type piezocomposites

Experimental and theoretical investigation of temperature-dependent electrical fatigue studies on 1-3 type piezocomposites

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

High Volume Production of PZT Fiber Arrays for Direct Functional Integration into Metal Structures

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