Abstract
Metal rubber (MR) is an entangled fibrous functional material, and its mechanical properties are crucial for its applications; however, numerical constitutive models of MR for prediction and calculation are currently undeveloped. In this work, we provide a numerical constitutive model to express the mechanics of MR materials and develop an efficient finite elements method (FEM) to calculate the performance of MR components. We analyze the nonlinearity and anisotropy characteristics of MR during the deformation process. The elasticity matrix is adopted to express the nonlinearity and anisotropy of MR. An artificial neural network (ANN) model is built, trained, and tested to output the current elastic moduli for the elasticity matrix. Then, we combine the constitutive ANN model with the finite element method simulation to calculate the mechanics of the MR component. Finally, we perform a series of static and shock experiments and finite element simulations of an MR isolator. The results demonstrate the feasibility and accuracy of the numerical constitutive MR model. This work provides an efficient and convenient method for the design and analysis of MR components.
Highlights
IntroductionThe form of the material, such as fiber, wire, or helix spring, is reconstructed through entanglement with itself to achieve new physical properties without changing the chemical composition
Entangled fibrous materials are emerging materials [1,2,3,4,5,6]
For accurate performance prediction and calculation of metal rubber (MR) components, we developed a numerical constitutive model of an MR material based on machine learning
Summary
The form of the material, such as fiber, wire, or helix spring, is reconstructed through entanglement with itself to achieve new physical properties without changing the chemical composition. These materials are called architectured or architected because their mechanical properties strongly depend on the geometry of their internal structure after scaling [7]. Unlike the wire inside metal mesh, which is entangled by folding and squeezing, metal rubber (MR) consists of a mass of tiny metal helix springs entangled with each other via embedding and interlacing during the forming process This entangled pattern of the tiny metal springs results in improved elasticity and mechanical properties; the MR components show excellent performance in engineering applications [13,14,15,16,17,18]
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