Dear colleagues,
We are happy to share a recent study on Multiscale Reduced-Order Modeling of a Titanium Skin Panel Subjected to Thermomechanical Loading, where we concurrently couple the response at a polycrystalline microstructure to that of a airplane panel structure, thorugh an eigenstrain-based reduced-order modeling technique. For more detials, see https://doi.org/10.2514/1.J060497, and an author's copy is aviable here: https://www.researchgate.net/publication/345654458_Multiscale_Reduced-Or....
Abstract: This paper presents the formulation, implementation, calibration, and application of a multiscale reduced-order model to simulate a titanium panel structure subjected to thermomechanical loading associated with high-speed flight. The formulation is based on the eigenstrain-based reduced-order homogenization model and further considers thermal strain as well as temperature-dependent material properties and evolution laws. The material microstructure (i.e., at the scale of a polycrystalline representative volume element) and underlying microstructural mechanisms are directly incorporated and fully coupled with a structural analysis, concurrently probing the response at the structural scale and the material microscale. The proposed approach was fully calibrated using a series of uniaxial tension tests of Ti-6242S at a wide range of temperatures and two different strain rates. The calibrated model is then adopted to study the response of a generic aircraft skin panel subjected to thermomechanical loading associated with high-speed flight. The analysis focuses on demonstrating the capability of the model to predict not only the structural scale response, but also simultaneously the microscale response, and it further studies the effects of temperature and texture on the response.
Thank you for your interest.
Best,
Xiang
The use of 3D printed metal structures is taking a very fast ramp-up in industry. General Electric has demonstrated the possibility of printing titanium fuel injectors for their LEAP engine, EADS has printed a nacelle hinge bracket for the Airbus A320, Boeing is printing plastic inlet ducts for high-altitude aircrafts, hip implants and other prosthetics are exploiting the design freedom of additive manufacturing (AM),...
Additive manufacturing of titanium and inconel superalloys yields great potential for the aerospace industry (and others) as it allows the generation of geometrically complex structures with high specific strength, low density and high corrosion and creep resistance at high temperatures. However the fatigue life prediction of such components cannot be done with traditional fatigue models for traditionally manufactured metals, because the fatigue life is influenced by various factors that are specific for 3D printing: process parameters, induced voids and defects, microstructure, surface roughness, etc.
In this Postdoctoral position, it is the purpose to further develop multi-scale models for fatigue of AM metals, taking into account the microstructure of the material. Those models will be implemented in an already developed software environment. The final objective is to develop an industrial software solution that can be applied to complex AM components and predict their fatigue life. The position is a fully numerical position, requiring advanced knowledge in numerical simulations (finite element method, Representative Volume Element-based multi-scale modelling), fatigue mechanics, computational crystal plasticity and also on extreme value statistics.
The project will be carried out in close collaboration with a large number of industrial companies in the field of additive manufacturing (Siemens, Materialise, Sabca, ESMA,…).
Only candidates with a PhD degree in Computational Mechanics, Mechanical Engineering, Materials Science, Civil Engineering, (Applied) Physics or similar should apply. You have a strong background in computational mechanics and have strong programming skills (preferably in C++ and/or Python), you are interested to perform numerical research and to interact and collaborate with industry.
For more information, please visit:
https://composites.ugent.be/PhD_job_vacancies_PhD_job_positions_composit...
https://doi.org/10.1088/1361-651X/ab602e
Link to author's personal copy
Abstract:
This manuscript presents a dislocation density informed eigenstrain based reduced order homogenization model (DD-EHM), and its application on a titanium alloy structure subjected to cyclic loading. The eigenstrain based reduced order homogenization (EHM) approach has been extended to account for the presence of HCP (primary α phase) and BCC (β phase) grains, within which the deformation process is modeled using a dislocation density based crystal plasticity formulation. DD-EHM has been thoroughly verified to assess the accuracy of the reduced order model in capturing local and global behavior compared with direct crystal plasticity finite element method (CPFEM) simulations. A structural scale study of titanium alloy Ti-6242S is performed using DD-EHM to quantify and characterize the spatial distribution and evolution of the dislocation pile-ups subjected to cyclic loading. The evolution of pileups at two spatial scales are tracked using a nonlocal parameter based on dislocation density discrepancy across neighboring grains. The effect of non-uniform texture on the response of the structural component has been investigated.
The use of 3D printed metal structures is taking a very fast ramp-up in industry. General Electric has demonstrated the possibility of printing titanium fuel injectors for their LEAP engine, EADS has printed a nacelle hinge bracket for the Airbus A320, Boeing is printing plastic inlet ducts for high-altitude aircrafts, hip implants and other prosthetics are exploiting the design freedom of additive manufacturing (AM),..
Additive manufacturing of titanium alloys yields great potential for the aerospace industry (and others) as it allows the generation of geometrically complex structures with high specific strength, low density and high corrosion resistance. However the inspection of such 3D printed components is almost impossible with traditional Non-Destructive Testing (NDT) techniques because of the typical complex geometries and internal cavities. A very interesting alternative is PCRT (Process Compensated Resonance Testing), a high-frequency vibration technique that tries to detect defects by evaluating relative shifts in the resonance spectrum.
In this postdoctoral position, it is the purpose to devise and build an upgraded PCRT set-up for inspecting 3D printed metal parts with complex geometry, to implement data-acquisition and to develop advanced post-processing tools for identification of small defects in the frequency domain. You will closely collaborate with another postdoctoral research in our group, as well as with several large industries (Materialise, Siemens and Vibrant). This postdoctoral position is partially funded by SIM-Flanders (Strategic Initiative Materials in Flanders).
Only candidates with a PhD degree or equivalent experience should apply. The candidate should have a strong experimental background in vibration techniques and data analysis in frequency domain.
More information can be found on
http://www.composites.ugent.be/PhD_job_vacancies_PhD_job_positions_compo...
The use of 3D printed metal structures is taking a very fast ramp-up in industry. General Electric has demonstrated the possibility of printing titanium fuel injectors for their LEAP engine, EADS has printed a nacelle hinge bracket for the Airbus A320, Boeing is printing plastic inlet ducts for high-altitude aircrafts, hip implants and other prosthetics are exploiting the design freedom of additive manufacturing (AM),...
Additive manufacturing of both stainless steel and titanium alloys yields great potential for the aerospace industry (and others) as it allows the generation of geometrically complex structures with high specific strength, low density and high corrosion resistance.
In this Postdoctoral position, it is the purpose to investigate both the opportunities and limitations of ultrasound techniques (range of 1 MHz – 100 MHz) for nondestructive inspection of 3D printed metal parts.
This involves :(i) the implementation of data-acquisition, (ii) the development of advanced post-processing approaches and (iii) the analysis in both time- and frequency domain. There are 3D printed metal parts with various post-processing conditions available (e.g. surface finishing, heat treatment, hot isotatic pressure …). In this way, the developed ultrasonic framework can be tested and evaluated for a wide variety of part conditions.
The research is in close collaboration with several leading companies in the development of 3D printing as well as with various academic partners.
Only candidates with a PhD degree or equivalent experience should apply. The candidate should have a strong background in ultrasound techniques and associated post-processing approaches.
More informationc can be found on : http://www.composites.ugent.be/PhD_job_vacancies_PhD_job_positions_compo...
The use of 3D printed metal structures is taking a very fast ramp-up in industry. General Electric has demonstrated the possibility of printing titanium fuel injectors for their LEAP engine, EADS has printed a nacelle hinge bracket for the Airbus A320, Boeing is printing plastic inlet ducts for high-altitude aircrafts, hip implants and other prosthetics are exploiting the design freedom of additive manufacturing (AM),...
Additive manufacturing of titanium alloys yields great potential for the aerospace industry (and others) as it allows the generation of geometrically complex structures with high specific strength, low density and high corrosion resistance.
However the inspection of such 3D printed components is almost impossible with traditional Non-Destructive Testing (NDT) techniques because of the typical complex geometries and internal cavities. A very interesting alternative is PCRT (Process Compensated Resonance Testing), a high-frequency vibration technique that tries to detect defects by isolating very small shifts in the resonance spectrum at very high frequencies.
In this Postdoctoral position, it is the purpose to build a PCRT set-up for inspecting 3D printed metal parts with complex geometry, to implement the data-acquisition and to develop advanced post-processing tools for identification of defects in the frequency domain. The research is in close collaboration with Materialise and Siemens, two leading companies in the development of 3D printing. The project is funded by SIM-Flanders (Strategic Initiative Materials in Flanders).
Only candidates with a PhD degree or equivalent experience should apply. The candidate should have a strong background in vibration techniques and data analysis in frequency domain.
More information can be found on:
http://www.composites.ugent.be/PhD_job_vacancies_PhD_job_positions_compo...
The use of 3D printed metal structures is taking a very fast ramp-up in industry. General Electric has demonstrated the possibility of printing titanium fuel injectors for their LEAP engine, EADS has printed a nacelle hinge bracket for the Airbus A320, Boeing is printing plastic inlet ducts for high-altitude aircrafts, hip implants and other prosthetics are exploiting the design freedom of additive manufacturing (AM),...
Additive manufacturing of titanium and inconel superalloys yields great potential for the aerospace industry (and others) as it allows the generation of geometrically complex structures with high specific strength, low density and high corrosion and creep resistance at high temperatures.
However the fatigue life prediction of such components cannot be done with traditional fatigue models for traditionally manufactured metals, because the fatigue life is influenced by various factors that are specific for 3D printing: process parameters, induced voids and defects, microstructure, surface roughness, etc.
In this Postdoctoral position, it is the purpose to develop suitable criteria for fatigue life prediction under multi-axial stress states, and validate them by multi-axial fatigue tests. Those criteria will be implemented in an already developed software environment. The researcher will work in close collaboration with Siemens Industry Software for this project, and will be supported by their development team. The final objective is to develop an industrial software solution that can be applied to complex AM components and predict their fatigue life.
The position is a mix of numerical simulation and experimental testing in the field of multi-axial fatigue of 3D printed metals. The candidate should be experience in both aspects of the work. The equipment for the multi-axial fatigue testing is available in the lab of the research group, together with all instrumentation methods.
Only candidates with a PhD degree or equivalent experience should apply. The candidate should have a strong background in fatigue life prediction for metals (e.g. critical plane approaches) and have experimental experience with fatigue testing. Experience in simulation of AM metals is recommended.
More information can be found on: http://www.composites.ugent.be/PhD_job_vacancies_PhD_job_positions_compo...
3D printing or Additive Manufacturing (AM) technologies carry the promise of revolutionizing the quality and efficiency of healthcare. However, the required technologies, even when available, are currently too fragmented to be integrated into routine, affordable and streamlined solutions that can benefit a large number of patients. The challenge thereby is to deliver 3D printing technologies that enable:
- Patient-specific solutions: personalized medical devices that are designed using the images acquired for individual patients and best fit their treatment needs;
- Complexity and miniaturization: complex shapes, articulations and miniaturized geometries of implantable medical devices and instruments have the potential to radically enhance treatment effectiveness and post-treatment recovery;
- Streamlined care: the ability to integrate diagnosis, design and manufacturing of AM medical devices into a validated software platform is the key to delivering fast, affordable treatments with dramatic life-saving potential.
The INTERREG project 3DMed aims to improve affordability and large-scale accessibility of medical treatment using 3D printed devices. This will be achieved by increasing the Technology Readiness Level (TRL) of state-of-the-art 3D printing technologies for medical applications and integrating them into a streamlined, fast, cost-effective software platform for use in routine clinical practice.
This project contains 17 partners from The Netherlands, Belgium, France and United Kingdom, including universities, hospitals, software suppliers, 3D printing companies, clinical observers, manufacturers of medical devices and implants,... The project is coordinated by TUDelft.
In this Postdoctoral position, it is the purpose to develop patient-specific design and finite element modelling of 3D printed medical implants. This position requires an in-depth knowledge of advanced design, finite element modelling and topology optimization, based on the processing and segmentation of patient-specific medical images.
Important criteria that will be investigated, are: (i) stress limits for a fatigue-safe design (under multi-axial loading); (ii) critical stress concentrations due to certain geometrical discontinuities; (iii) stiffness match (or mismatch) with surrounding body parts; (iv) thermal behaviour of the part at body temperature.
Different orthotics and prosthetics will be covered and a close collaboration will be required with the researchers at TUDelft, clinical observers, AM service providers and software companies.
Only candidates with a PhD degree or equivalent experience should apply. The candidate should have a strong background in design and FE modelling for medical applications. He/she will closely work together with the other postdoc in the team (see other vacancy) and is willing to travel frequently to meet and discuss with the other project partners in the neighbouring countries.
More information on: http://www.composites.ugent.be/PhD_job_vacancies_PhD_job_positions_compo...
We look for 4 postdoctoral researchers (or equivalent by experience) in the field of software development for and nondestructive inspection of 3D printed components. The targeted sectors of application are medical and high-end industrial applications. Companies are strongly involved in the research projects.
More information can be found on http://www.composites.ugent.be/PhD_job_vacancies_PhD_job_positions_compo....
Cyclic Plasticity and Microstructure of As-built SLM Ti-6Al-4V: The Effect of Build Orientation
D. Agius, K.I. Kourousis, C. Wallbrink, T. Song
Materials Science & Engineering: A (2017) -- Free access to the full article available at: https://authors.elsevier.com/a/1VHXL_Ky~FZJ6H
Dear friends, i current doing a project work on testing fatigue life of superelastic nitinol. And since i am very new in using abaqus for testing the simulation, i seeking help from people around here to ask for method to test the work. My objective is to set a maximum elongation for 1%-6% of elongation and test for 40,000 cycle if it can work for this amount of cycle..
i Hope anyone can help me as i need to finish this project in order to graduate and i didnt get any single help from regarding this software from my side..
A PhD position is avalaible at the Centre des Matériaux of Mines ParisTech (Paris, France). The research will focus on "Experimental and numerical analysis of sustained load cracking in Titanium". The candidates should have a master degree in mechanics, materials sciences and engineering, or computational mechanics. A full decription of the subject is attached. Interested applicants please send a resume to Dr. Matthieu Maziere (maziere@mat.ensmp.fr).
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