Showing papers in "Materials & Design in 2019"

TL;DR: In this paper, the recent progress on Ti6Al4V fabricated by three mostly developed additive manufacturing techniques-directed energy deposition (DED), selective laser melting (SLM) and electron beam melting (EBM)-is thoroughly investigated and compared.

TL;DR: A comprehensive summary of the experimental data reported on the mechanical response of Selective Laser Melting (SLM) lattice structures can be found in this paper, where the design, fabrication and performance of SLM lattice structure are reviewed and the quality of data reported to inform best-practice for future studies.

TL;DR: In this article, the state-of-the-art developments in the design for additive manufacturing (DfAM) and structural optimisation, becomes vital for successfully shaping the future AM-landscape.

TL;DR: In this paper, a review of 2D and 3D chiral mechanical metamaterials is presented, and their mechanical behaviors and deformation mechanisms can be investigated through equilibrium principle, strain energy analysis, micropolar elasticity and homogenization theories.

TL;DR: This study attempted to predict solidification defects by DNN regression with a small dataset that contains 487 data points and found that a pre-trained and fine-tuned DNN shows better generalization performance over shallow neural network, support vector machine, and DNN trained by conventional methods.

TL;DR: In this article, the influence of laser power during selective laser melting (SLM) on the grain morphology and texture component in AlSi10Mg alloy has been investigated, using electron backscattered diffraction (EBSD).

TL;DR: In this article, the authors show that mycelium-based composites can be tuned by varying type of substrate (straw, sawdust, cotton), fungal species (Pleurotus ostreatus vs. Trametes multicolor) and processing technique (no pressing or cold or heat pressing).

TL;DR: In this paper, the mechanical properties of polymeric gyroid-structure specimens made of PA 2200 at different relative densities were investigated both experimentally and computationally using finite element analysis.

TL;DR: In this article, two different types of multi-layer lattice sandwich panels, BCC and BCCZ, are prepared by selective laser melting (SLM) using the AlSi10Mg material.

TL;DR: In this article, graded gyroid cellular structures (GCSs) with varying gradient directions were designed and manufactured via selective laser melting (SLM), and the surface morphology and mechanical response of these structures under compressive loads were investigated.

TL;DR: In this article, the effect of laser power on defect characteristics, microstructure development, constituent phases, and crystallographic texture was studied on a laser powder bed fusion (L-PBF) processed 316L stainless steel.

TL;DR: In this article, extensive indentation experiments (~50,000) and finite element simulations are carried out for a wide range of materials to systematically determine the minimum spacing of indents, and it was found that a minimum indent spacing of 10 times the indentation depth is sufficient to obtain accurate results for a Berkovich indenter.

TL;DR: In this article, stable micro-craters and nano-terraces on AA5052 sheet with enhanced water repellence and durable corrosion resistance are fabricated via low-cost subtractive manufacturing (SM) strategy.

TL;DR: In this paper, two different polymer resins were used to create three different octet-truss lattice structures of different densities, and the mechanical behavior of these structures has been examined under both quasi-static and dynamic compressive loading.

TL;DR: In this paper, the additive manufacturing (AM) representative strut FE model's axial stiffness and critical buckling load is compared to idealised-and μCT-based FE models, with significant error reduction over idealised strut models.

TL;DR: In this paper, a review of the state-of-the-art in the field of fracture mechanics is presented, with a focus on the modern experimental approaches to fine scale fracture toughness evaluation.

TL;DR: In this article, a continuous flax fiber/PLA (cFF/PLA) composite filaments made with a customized co-extrusion process and printed with a simple and affordable printing machine were used to optimize the mechanical properties of biocomposites.

TL;DR: In this paper, a 3D-printable engineered cementitious composites (ECC) exhibiting ultra-high tensile strain capacity of more than 8%, which can be used for digital construction of self-reinforced concrete structures, reducing the reliance on conventional steel reinforcement.

TL;DR: In this paper, two TPMS structures, the Schwarz Primitive (P) and Gyroid structures, were designed with both uniform and graded density and fabricated using additive manufacturing (Stereolithography) to study the mechanical properties and energy absorption abilities of the printed TPMS samples.

TL;DR: In this article, the microstructure of the AlxCoCrFeNiTiy high entropy alloy (HEA) system was studied using X-ray diffraction, scanning and transmission electron microscopy.

TL;DR: In this article, the defect content of metal additive manufacturing (AM) specimens and correlations between defect characteristics (size, sphericity/circularity, aspect ratio) using 2D and 3D defect characterization techniques were investigated.

TL;DR: In this article, the authors explored a method to strengthen the interlayer bonds by applying a cementitious paste at the interface, to minimise voids and promote bond area, using a flatbed scanner and a unique method of image processing on printed color layers.

TL;DR: In this paper, the effect of cell-wall thickness on the deformation mode of metallic auxetic reentrant honeycomb was firstly studied, and also the negative Poisson's ratio (NPR) effect on the crushing stress was also clarified by the quasi-static compressive experiments.

TL;DR: In this paper, the authors compared the microstructure and tensile properties of Hastelloy X built with low and high power lasers and found that the use of a high power laser results in wider and shallower melt pools inducing an enhanced morphological and crystallographic texture along the building direction.

TL;DR: In this article, the effect of a range of grading methodologies on the energy absorbing and damping behavior of flexible TPU honeycomb structures was explored, which revealed the potential of density grading of TPU structures to provide superior impact protection in extreme environmental conditions.

TL;DR: In this paper, the role of the prior austenite grain size (PAGS) in the martensitic transformation in low-carbon steels was investigated and the transformation kinetics was experimentally studied for PAGS in the range from 6 to 185μm and theoretically analyzed based on the nucleation rate and the thermodynamic balance between the chemical driving force and the resistance exerted by the austenites against the progress of the transformation.

TL;DR: A surface modification strategy to enhance the bioactivity of 3D printed scaffolds for bone tissue regeneration is presented and surface roughness and water wettability were enhanced after surface modification.

TL;DR: In this paper, two theoretical models have been built to predict the tensile strength and Young's modulus of FDM additive manufacturing PLA material with different printing angles and layer thicknesses.

TL;DR: In this paper, an equiatomic CoCrFeNiMn high-entropy alloy (HEA) powder is produced by vacuum induction melting gas-atomization with argon gas.

TL;DR: A Schiff base containing dual-dynamic covalent bonds synthesized from the biomaterials, cystine and vanillin, showed excellent reversibility under external stimuli by metatheses.