By Ivan Argatov, Gennady Mishuris
This booklet provides a complete and unifying method of articular touch mechanics with an emphasis on frictionless touch interplay of skinny cartilage layers. the 1st a part of the e-book (Chapters 1–4) stories the result of asymptotic research of the deformational habit of skinny elastic and viscoelastic layers. A accomplished assessment of the literature is mixed with the authors’ unique contributions. The compressible and incompressible situations are taken care of individually with a spotlight on distinct strategies for asymptotic versions of frictionless touch for skinny transversely isotropic layers bonded to inflexible substrates formed like elliptic paraboloids. the second one half (Chapters five, 6, and seven) bargains with the non-axisymmetric touch of skinny transversely isotropic biphasic layers and offers the asymptotic modelling technique for tibio-femoral touch. The 3rd a part of the ebook involves bankruptcy eight, which covers touch difficulties for skinny bonded inhomogeneous transversely isotropic elastic layers and bankruptcy nine, which addresses a number of perturbational features in touch difficulties and introduces the sensitivity of articular touch mechanics.
This booklet is meant for complicated undergraduate and graduate scholars, researchers within the region of biomechanics, and engineers and thinking about the research and layout of thin-layer structures.
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Additional resources for Contact Mechanics of Articular Cartilage Layers: Asymptotic Models
109)), while the ratio A44 /A33 vanishes. 120) reduce to the following: v ε2 w ε3 1 h∗ (1 − ζ )2 − (1 − ζ ) ∇η q, 2 a44 1 h∗ 1 (1 − ζ )3 − (1 − ζ )2 Δη q. 122) Note that a44 = A44 is the out-of-plane shear modulus. 112). 123) and the incompressibility condition is ∇y · v + ∂w = 0. 125) while at the upper surface, under the assumption of normal loading, we have σ13 z=0 = σ23 z=0 = 0, σ33 z=0 = −q. 126) z=0 ∂w −p ∂z = −q. 127) z=0 Assuming that the elastic layer is relatively thin and h = εh ∗ , we introduce the stretched normal coordinate ζ = ε−1 h −1 ∗ z and the dimensionless in-plane coordinates η = (η1 , η2 ), ηi = h −1 ∗ yi , i = 1, 2.
The transformation of the coordinates (y1n , y2n ) to the common set of axes (y1 , y2 ) inclined at the angle βn to the axis y1n is given by y1n = y1 cos βn − y2 sin βn , y2n = y1 sin βn + y2 cos βn . 1 Contact Problem Formulation 21 Fig. , (n) κ1 1 = (n) R1 (n) , κ2 1 = (n) R2 . 4). For instance, let us choose the angle β1 in such a way that (1) (1) (2) κ2 − κ1 (2) sin 2β1 + κ2 − κ1 sin 2β2 = 0. 7) Taking into account that (see Fig. 8) from Eq. 7), we readily find (2) tan 2β1 = (1) κ2 (2) κ 2 − κ1 (1) − κ1 (2) κ2 + sin 2β (2) − κ1 cos 2β .
If the surface point M (y , z ) of the first layer (laying in the domain z ≤ −ϕ1 (y)) and the surface point M (y , z ) of the second layer (laying in the domain z ≥ ϕ2 (y)) coincide after deformation (see Fig. 4), the following relations hold true : F 2 δ0 y1 1 F Fig. 1 Contact Problem Formulation 23 Fig. 15) (1) ϕ2 (y ) + w0 (y ) = − ϕ1 (y ) + w0 (y ) + δ0 . 16) Here, w0n (y) (n = 1, 2) are the absolute values of the vertical displacements of the surface points of the n-th elastic layer (the normal displacements are assumed to be measured positive into each layer), v0n (y) (n = 1, 2) are the tangential displacements of the surface points, and the relations z = −ϕ1 (y ) and z = ϕ2 (y ) were taken into account in writing Eq.