On brittle fracture of two‐dimensional lattices with material anisotropies

Abstract

For the first time, this paper proposes a multiscale computational approach to investigate mixed‐mode I/II fracture in two‐dimensional lattices containing material anisotropies which find their applications in additive manufacturing of cellular structures. The layer‐by‐layer fabrication of lattices produced by the additive manufacturing techniques causes material anisotropies corresponding to the build orientation. Such material anisotropies, together with the cell topology, affect the fracture behavior of lattice components under various mechanical loading. The effective macroscopic elastic properties of periodic lattices obtained via numerical homogenization are fed into a continuum‐based fracture criterion to obtain crack path and onset of fracture under mixed‐mode I/II conditions. Different cell topologies are considered, and the predictions are compared with the results obtained directly by the finite element analysis. The results of this work can pave the way toward further understanding, and eventually, optimizing fracture toughness of additively manufactured lattices against various loading profiles.

Fracture toughness of a rigid polyurethane foam: experimental and numerical investigation by varying the specimen sizes

“…Cellular materials are nowadays very popular materials due to lightweight, efficient, and superior design for engineering structures, 1 with applications in different fields such as defense, healthcare, automotive, construction, and aerospace, 2 and used both as a stand-alone material and in combination to other ones to form composites. 3 They can be classified into natural and man-made (manufactured) cellular materials.…”

Developing Mixed-Mode (I/II) Fracture Resistance Curves for Asphalt Concrete Mixtures at Low Temperatures

“…Therefore, a mixed mode (I/II) definition to the fracture phenomenon gains substantial attention. Various aspects of the mixed mode (I/II) fracture of asphalt concrete pavements have been investigated by researchers so far [1,2]. However, most of the research rely on characterization of the mixtures using classical concept of fracture mechanics such as the stress intensity factor or fracture toughness.…”

Developing a Single-Specimen Technique for Low-Temperature R-Curve Determination of Asphalt Concrete Using a Modified Unloading Compliance Method

“…Extensive research has been carried out for the past two decades on low-temperature fracture performance of asphalt concrete mixtures [1,2]. Single-parameter fracture testing and analyses has been an interesting topic for the researchers in this field.…”