Link to paper: Fracture and structural performance of adhesively bonded 3D-printed PETG single lap joints under different printing parameters
Abstract
The present study, deals with fracture behavior of adhesively bonded 3D-printed joints. Polyethylene terephthalate glycol (PETG) is used to print standard specimens with different printing parameters (raster angle, raster width, and layer thickness) using fused deposition modeling (FDM) process. Moreover, adhesive layer with different thicknesses is employed to determine effects of adhesive layer thickness on the structural integrity of 3D-printed joints. By a series of tensile tests on the single lap joint specimens, influence of above-mentioned 3D printing parameters on the mechanical behavior of PETG joints is determined. Moreover, numerical study was conducted to verify experimental results and provide enhanced knowledge on fracture behavior of these types of joints. The nonlinear 3D finite element model of the joint supports mechanical characteristics of both 3D-printed adherends and adhesive materials. The effect of above mentioned 3D printing parameters in stress distribution and failure behavior of the joints are examined and reported. Considering a growing interest in FDM 3D printing technology in manufacturing and numerous applications of adhesively bonded joints, reported results are beneficial for future developments of new designs of 3D printed adhesively bonded products with a higher strength and better structural performance.
Monolithic Bulk Metallic Glasses (BMGs) exhibit strain softening or elastic-perfectly plastic response under uniaxial loading. However, shape memory alloy particle reinforced BMG matrix composites show strong work hardening in experiments. In our recent paper published in Scripta Materialia, we explain the Mechanistic origins of work hardening in shape memory alloy particle reinforced ex-situ bulk metallic glass matrix composites through three dimensional finite element simulations.
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New Paper: "Numerical insights on the structural assessment of historical masonry stellar vaults: the case of Santa Maria del Monte in Cagliari" Enjoy this free version of the paper!
The aim of this paper is to present an in-depth numerical investigation on the statics of historical masonry stellar vaults, a special class of masonry ribbed vaults whose three-dimensional geometry features a star-shaped projection on the horizontal plane. In particular, the mechanical behavior of the masonry stellar vault belonging to the church of Santa Maria del Monte in Cagliari (Italy) is analyzed and illustrated as an especially meaningful case study. This church, which was built during the second half of the sixteenth century, is a beautiful example of Gothic-Catalan style, and its ribbed stellar vault is one of the most representative of this type in the town of Cagliari. The geometric outline of the vault has been obtained through laser scanning techniques and a procedure of reverse engineering. Starting from a three-dimensional representation of its geometry, the ultimate load-bearing capacity of the stellar vault can be accurately estimated through a recently developed, NURBS-based upper-bound limit analysis scheme. A comparison with incremental nonlinear analyses carried out with the commercial finite element code DIANA is presented. Furthermore, the paper also includes a sensitivity study aimed at investigating the role of ribs on the ultimate load-bearing capacity of the structure.
The Automated Computational Mechanics Laboratory (ACML) at The Ohio State University has an immediate opening for a one-year postdoctoral research associate position. The project is aimed at the application of the finite element method for simulating and optimizing the multiphysics laser ablation process in aircrafts. The optimization process involves characterizing the optimal laser parameters (e.g., peak power, fluence, intensity, etc.) to maximize the coating removal efficiency while minimizing damage to the substrate material. Applicants with outstanding background in computational mechanics and familiar with the finite element method are encouraged to apply by sending their CV to Dr. Soheil Soghrati at soghrati.1@osu.edu (application deadline: 06/01/2015). All applicants must have the following conditions:
- Currently study or have a postdoc position in the US.
- Have OPT, J1 visa, or be a US permanent resident/citizen (no applicant with H1B visa will be considered).
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ACML website: https://acml.engineering.osu.edu/
The Automated Computational Mechanics Laboratory (ACML) at The Ohio State University announces a new PhD position available for Spring 2014. The related research project focuses on the application of an advanced finite element method for simulating damage and crack propagation in heterogeneous composites. Applicants with strong background in computational solid mechanics are encouraged to apply by 09/15/2013. Please also send a copy of your CV, a two-page SOP, and the contact information of at least three references to Dr. Soheil Soghrati (Soghrati.1@osu.edu).
The Automated Computational Mechanics Laboratory (ACML) in the Department of Mechanical and Aerospace Engineering at The Ohio State University has one open PhD position for Spring 2014. The research in ACML is focused on the implementation of advanced finite element and meshfree methods for the computational modeling of materials with complex geometries, corrosion, damage/fracture mechanics, and multi-physics simulations. Outstanding applicants with interests and strong background in computational mechanics experience in C++ programming are encouraged to apply immediately. Please also send a copy of your CV and the contact information of three references to Dr. Soheil Soghrati (Soghrati.1@osu.edu).