Elastoplastic analysis of thermal cycling: layered materials with compositional gradients

Giannakopoulos, A.E.; Suresh, S.; Finot, M.; Olsson, Mårten

doi:10.1016/0956-7151(94)00360-t

Cited by 189 publications

(64 citation statements)

References 7 publications

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“…[3,5,7] Such grading, either continuous or in ever-finer, discrete steps, across an interface and between two dissimilar materials, has been used to redistribute thermal stresses, [8] thereby limiting the stresses at critical locations and thus suppressing the onset of permanent (plastic) deformation, damage, or cracking. [9][10][11] Grading of composition is particularly beneficial at mechanical interfaces between dissimilar materials, where stress and strain jumps naturally arise due to mismatch in elastic properties. [12][13][14][15][16] A particularly important engineering application of such grading of interfaces is in multilayers.…”

Section: Introductionmentioning

confidence: 99%

Stress Reduction of 3D Printed Compliance‐Tailored Multilayers

et al. 2017

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Multilayered multi-material interfaces are encountered in an array of fields. Here, enhanced mechanical performance of such multi-material interfaces is demonstrated, focusing on strength and stiffness, by employing bondlayers with spatially-tuned elastic properties realized via 3D printing. Compliance of the bondlayer is varied along the bondlength with increased compliance at the ends to relieve stress concentrations. Experimental testing to failure of a tri-layered assembly in a single-lap joint configuration, including optical strain mapping, reveals that the stress and strain redistribution of the compliance-tailored bondlayer increases strength by 100% and toughness by 60%, compared to a constant modulus bondlayer, while maintaining the stiffness of the joint with the homogeneous stiff bondlayer. Analyses show that the stress concentrations for both peel and shear stress in the bondlayer have a global minimum when the compliant bond at the lap end comprises %10% of the bondlength, and further that increased multilayer performance also holds for long (relative to critical shear transfer length) bondlengths. Damage and failure resistance of multi-material interfaces can be improved substantially via the compliance-tailoring demonstrated here, with immediate relevance in additive manufacturing joining applications, and shows promise for generalized joining applications including adhesive bonding.

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Section: Introductionmentioning

confidence: 99%

Stress Reduction of 3D Printed Compliance‐Tailored Multilayers

et al. 2017

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“…An equal biaxial stressed state is known to be the most appropriate approximation to describe the stressed state in real layered specimens [13]. This is the case of infinite dimensions along directions y and z, but with finite value of specimen thickness.…”

Section: (3)mentioning

confidence: 99%

Fracture Resistance of Residually-Stressed Ceramic Laminated Structures

Gogotsi

Lugovoi

Slyunyaev

2004

Strength of Materials

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“…So far a number of analytical and computational methods to predict thermal stress states in functionally graded materials (FGMs) and design optimal FGMs have been proposed [6,7]. Some of them considered macroscopic heterogeneity, and used the simple rules of mixture such as Voghit and Reuss rules to derive effective properties of the composites.…”

Section: Open Accessmentioning

confidence: 99%

Micromechanical Simulation of Thermal Cyclic Behavior of ZrO2/Ti Functionally Graded Thermal Barrier Coatings

Tsukamoto

2015

Coatings

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This study numerically investigates cyclic thermal shock behavior of ZrO2/Ti functionally graded thermal barrier coatings (FG TBCs) based on a nonlinear mean-field micromechanical approach, which takes into account the time-independent and dependent inelastic deformation, such as plasticity of metals, creep of metals and ceramics, and diffusional mass flow at the ceramic/metal interface. The fabrication processes for the FG TBCs have been also considered in the simulation. The effect of creep and compositional gradation patterns on micro-stress states in the FG TBCs during thermal cycling has been examined in terms of the amplitudes, ratios, maximum and mean values of thermal stresses. The compositional gradation patterns highly affect thermal stress states in case of high creep rates of ZrO2. In comparison with experimental data, maximum thermal stresses, amplitudes and ratios of thermal stresses can be effective parameters for design of such FG TBCs subject to cyclic thermal shock loadings.

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Elastoplastic analysis of thermal cycling: layered materials with compositional gradients

Cited by 189 publications

References 7 publications

Stress Reduction of 3D Printed Compliance‐Tailored Multilayers

Stress Reduction of 3D Printed Compliance‐Tailored Multilayers

Fracture Resistance of Residually-Stressed Ceramic Laminated Structures

Micromechanical Simulation of Thermal Cyclic Behavior of ZrO2/Ti Functionally Graded Thermal Barrier Coatings

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