scholarly journals Photopolymerized AM materials: modelling of the printing process, mechanical behavior and sensitivity analysis

2021 ◽  
Author(s):  
Mattia Pancrazio Cosma ◽  
Roberto Brighenti
Keyword(s):  
Sensitivity Analysis ◽  
Mechanical Behavior ◽  
Printing Process ◽  
Materials Modelling

An integrated parameter calibration method and sensitivity analysis of microparameters on mechanical behavior of transversely isotropic rocks

2022 ◽  
Vol 142 ◽  
pp. 104573
Author(s):  
Zhenhao Xu ◽  
Zhaoyang Wang ◽  
Wenyang Wang ◽  
Peng Lin ◽  
Jie Wu
Keyword(s):  
Sensitivity Analysis ◽  
Mechanical Behavior ◽  
Transversely Isotropic ◽  
Calibration Method ◽  
Parameter Calibration

scholarly journals Mechanical behavior of beams with variable stiffness obtained by 3D printing

2021 ◽  
Vol 343 ◽  
pp. 08014
Author(s):  
Laszlo Racz ◽  
Mircea Cristian Dudescu
Keyword(s):  
3D Printing ◽  
Mechanical Behavior ◽  
Cross Section ◽  
Process Parameters ◽  
Fused Deposition Modeling ◽  
Cost Effective ◽  
Variable Stiffness ◽  
Constant Cross Section ◽  
Printing Process ◽  
Fused Deposition

Additive manufacturing or 3D printing gained a widespread popularity in recent years due to the ability of the method to manufacture components with high geometrical complexity. The most cost-effective process to manufacture plastic parts using 3D printing is the fused deposition modeling (FDM) method. Process parameters as the infill rates but also the printed pattern of different layers and their orientation have a significant influence on the mechanical properties of specimens fabricated by FDM. Controlling the process parameters is possible to generate materials with variable mechanical proprieties. The paper presents the analysis of a beam with constant cross-section but variable stiffness. Variable stiffness is achieved by changes in different cross-sections of the beam of the infill rates of the printing process. The mechanical behavior consisting of force-displacements curves is analyzed by three-point bending tests of variable stiffness samples and comparison with similar beams having constant infill rate. The results consist of E-modulus variation, maximum force and deflection curve. Analytical calculations and finite element analyses are employed to predict the mechanical behavior of the specimens printed with variable infill rate. The obtained results proved the concept of equal stress-beam with constant cross-section obtained by 3D printing process parameters variation.

scholarly journals Enhancing Structural Performance of Short Fiber Reinforced Objects through Customized Tool-Path

2020 ◽  
Vol 10 (22) ◽  
pp. 8168
Author(s):  
Jaeyoon Kim ◽  
Bruce S. Kang
Keyword(s):  
Mechanical Properties ◽  
3D Printing ◽  
Mechanical Behavior ◽  
Case Studies ◽  
Fused Deposition Modeling ◽  
Tool Path ◽  
Spur Gear ◽  
Fiber Reinforced ◽  
Printing Process ◽  
Fused Deposition

Fused deposition modeling (FDM) is one of the most common additive manufacturing (AM) technologies for thermoplastic materials. With the development of carbon fiber-reinforced polymer (CFRP) filament for FDM, AM parts with improved strength and functionality can be realized. CFRP is anisotropic material and its mechanical properties have been well studied, however, AM printing strategy for CFRP parts has not been developed. This paper proposes a systematic optimization of the FDM 3D printing process for CFRP. Starting with standard coupon specimen tests to obtain mechanical properties of CFRP, finite element analyses (FEA) were conducted to find principal directions of the AM part and utilized to determine fiber orientations. A specific tool-path algorithm has been developed to distribute fibers with the desired orientations. To predict/assess the mechanical behavior of the AM part, the 3D printing process was simulated to obtain the anisotropic mechanical behavior induced by the customized tool-path printing. Bolt hole plate and spur gear were selected as case studies. FE simulations and associated experiments were conducted to assess their performance. CFRP parts printed by the optimized tool-path shows about 8% higher stiffness than those printed at regular infill patterns. In summary, assisted by FEA, a customized 3D printing tool-path for CFRP has been developed with case studies to verify the proposed AM design optimization methodology for FDM.

scholarly journals Enhancement of High-Resolution 3D Inkjet-Printing of Optical Freeform Surfaces Using Digital Twins

Micromachines ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 35
Author(s):  
Ingo Sieber ◽  
Richard Thelen ◽  
Ulrich Gengenbach
Keyword(s):  
Sensitivity Analysis ◽  
Inkjet Printing ◽  
Optical Model ◽  
Measurement Data ◽  
Optical Power ◽  
Printing Process ◽  
Digital Twins ◽  
Optical Freeform Surfaces ◽  
Cost Efficient ◽  
Nominal Performance

3D-inkjet-printing is just beginning to take off in the optical field. Advantages of this technique include its fast and cost-efficient fabrication without tooling costs. However, there are still obstacles preventing 3D inkjet-printing from a broad usage in optics, e.g., insufficient form fidelity. In this article, we present the formulation of a digital twin by the enhancement of an optical model by integrating geometrical measurement data. This approach strengthens the high-precision 3D printing process to fulfil optical precision requirements. A process flow between the design of freeform components, fabrication by inkjet printing, the geometrical measurement of the fabricated optical surface, and the feedback of the measurement data into the simulation model was developed, and its interfaces were defined. The evaluation of the measurements allowed for the adaptation of the printing process to compensate for process errors and tolerances. Furthermore, the performance of the manufactured component was simulated and compared with the nominal performance, and the enhanced model could be used for sensitivity analysis. The method was applied to a highly complex helical surface that allowed for the adjustment of the optical power by rotation. We show that sensitivity analysis could be used to define acceptable tolerance budgets of the process.

Application of TEM to Deformation, Wear, and Fracture of Ceramics

1974 ◽  
Vol 32 ◽  
pp. 472-473
Author(s):  
B. J. Hockey
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Mechanical Behavior ◽  
Brittle Materials ◽  
High Temperature Strength ◽  
Wide Range ◽  
Corrosive Environments ◽  
Further Development

Ceramics, such as Al2O3 and SiC have numerous current and potential uses in applications where high temperature strength, hardness, and wear resistance are required often in corrosive environments. These materials are, however, highly anisotropic and brittle, so that their mechanical behavior is often unpredictable. The further development of these materials will require a better understanding of the basic mechanisms controlling deformation, wear, and fracture.The purpose of this talk is to describe applications of TEM to the study of the deformation, wear, and fracture of Al2O3. Similar studies are currently being conducted on SiC and the techniques involved should be applicable to a wide range of hard, brittle materials.

Mechanical Behavior of Materials

2005 ◽  
Author(s):  
William F. Hosford
Keyword(s):  
Mechanical Behavior
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