Strength Analysis of Syntactic Foams Using a Three-Dimensional Continuum Damage Finite Element Model

Abstract

The failure behavior of the syntactic foams is investigated based on a three-dimensional (3D) micromechanical finite element (FE) model, by varying the volume fraction, the wall thickness of the hollow particles, and the interfacial strength. The maximum princi pal stress criterion is adopted to determine the state (damaged or undamaged) for both interface and matrix. Material property degradation is used to describe the mechanical behavior of those damaged elements. The current model can reasonably predict the ten sile strength of the syntactic foams with high volume fractions (40%-60%). The failure mechanism of the syntactic foam under uniaxial tension is captured by analyzing the stress-strain curves and the contours of damaging evolution process. Results from the quantitative simulations demonstrate that the tensile strength of the syntactic foam can be improved effectively by enhancing the interfacial strength.

Mechanical Metamaterials Foams with Tunable Negative Poisson’s Ratio for Enhanced Energy Absorption and Damage Resistance

“…First, plastic-damage constitute model for the 3D-printed VeroWhite Plus materials is introduced. It is well known that for the heterogeneous materials there is an important relation between the damage field and deformations of the microstructures [ 53 , 54 , 55 , 56 ]. Increase of the damage means the deterioration of the structural integrity of the intrinsic microstructures.…”