Validating a nonlinear elastic model for predicting the nonlinear mechanical behaviour of plasma sprayed YSZ coatings under tension

Patibanda, Supriya; Abrahams, Ralph; Jonnalagadda, Krishna; Gong, Xiaopeng

doi:10.1016/j.surfcoat.2020.126770

Cited by 2 publications

(1 citation statement)

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“…The total stress and strain were calculated from literature. [35][36][37] The cracking strain was calculated using the concept of total strain in the coating at a particular stress being equal to the sum of the plastic strain/cracking strain at the inter-splat boundary and the elastic strain of the splat (see Equation 1). The damage parameter D was calculated using Equation 2.…”

Section: 𝑒 𝑐 = 𝑒 𝑡 − 𝑒 𝐸mentioning

confidence: 99%

Damage accumulation in plasma‐sprayed zirconia under cyclic loading

Lal

Ramanadham²,

Kumar³

et al. 2022

J Am Ceram Soc.

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The stiffness and hysteretic response due to mechanical and thermo‐mechanical cycling have been studied in plasma‐sprayed yttria‐stabilized zirconia (YSZ). Mechanical cycling of free‐standing cantilevers of YSZ shows that the progressive decrease in stiffness is accompanied by monotonic increase in hysteretic energy dissipation per cycle and a permanent ratcheting displacement of ∼20 nm/cycle. Below a critical stress, it varies from coating to coating, ratcheting accompanied by a slow decrease in stiffness does not lead to failure even after ∼1000 cycles. In contrast, at higher stresses, the rates of ratcheting and decrease in stiffness increase rapidly, leading to the nucleation of macrocracks that lead to fracture failure. Prior thermal cycling of coatings on Inconel substrate up to 700°C, which induced an estimated cyclic thermal stress of ∼35 MPa, led to a pronounced reduction in stiffness and mechanical cycling life. During bending, damage accumulates in the tension side of the cantilever and the volume going through the compression cycle remains relatively undamaged.

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Section: 𝑒 𝑐 = 𝑒 𝑡 − 𝑒 𝐸mentioning

confidence: 99%