An Approach for Material Model Identification of a Composite Coating Using Micro-Indentation and Multi-Scale Simulations

Abstract

While deposited thin film coatings can help enhance surface characteristics such as hardness and friction, their effective incorporation in product design is restricted by the limited understanding of their mechanical behavior. To address this, an approach combining micro-indentation and meso/micro-scale simulations was proposed. In this approach, micro-indentation testing was conducted on both the coating and the substrate. A meso-scale uniaxial compression finite element model was developed to obtain a material model of the coating. This material model was incorporated within an axisymmetric micro-scale model of the coating to simulate the indentation. The proposed approach was applied to a Ti/SiC metal matrix nanocomposite (MMNC) coating, with a 5% weight of SiC nanoparticles deposited over a Ti-6Al-4V substrate using selective laser melting (SLM). Micro-indentation testing was conducted on both the Ti/SiC MMNC coating and the Ti-6Al-4V substrate. The results of the meso-scale finite element indicated that the MMNC coating can be represented using a bi-linear elastic-plastic material model, which was incorporated within an axisymmetric micro-scale model. Comparison of the experimental and micro-scale model results indicated that the proposed approach was effective in capturing the post-indentation behavior of the Ti/SiC MMNC coating. This methodology can also be used for studying the response of composite coatings with different percentages of reinforcements.

Experimental Verification of the Boundary Element Method for Adhesive Contacts of a Coated Elastic Half-Space

“…In addition to purely analytical methodology, numerical simulations are also widely used for solving the contact tasks involving layers of a given thickness. Commonly used numerical methods are the finite element method (FEM) [17][18][19] and the Fourier-based residuals molecular dynamics (RMD) [20], among others [21]. At present, the FFT-assisted boundary element method (BEM) is considered the most powerful technique for simulation contacts.…”

Теоретико-Экспериментальный Подход К Определению Механических Характеристик Тонких Полимерных Композитных Покрытий

“…В настоящей работе сделана попытка оценить предел текучести тонких покрытий из полимерных композитных материалов с матрицей на основе фенилона С2 и различными мелкодисперсными наполнителями с помощью сравнения конечноэлементной модели индентирования и экспериментальных данных. В [17,18] показано, что с помощью конечноэлементной модели индентирования можно достаточно точно воспроизводить результаты эксперимента.…”