Daniele Barbera

Daniele Barbera
University of Glasgow | UofG · School of Engineering

BSc Material Science, MSc Astronautical Eng., PhD Mechanical and Aerospace Eng.

About

26
Publications
29,724
Reads
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249
Citations
Introduction
His main areas of research are process modelling of inertia friction welding for aerospace application and high-temperature structural integrity, focusing on material and structure numerical modelling. Currently, he is investigating new remeshing scheme for IFW and material modelling for nickel superalloys. During his Ph.D. and past research, he investigated the effects of high-temperature creep and fatigue on the crack initiation process in metallic structures. He also has other areas of interest such as advanced materials and space deployable structures.
Additional affiliations
August 2017 - present
University of Glasgow
Position
  • Research Associate
October 2016 - July 2017
University of Strathclyde
Position
  • Research Assistant
October 2013 - September 2016
University of Strathclyde
Position
  • PhD Student
Description
  • High temperature creep modelling
Education
October 2010 - July 2013
Sapienza University of Rome
Field of study
  • Aerospace Engineering
September 2006 - June 2010
University of Rome Tor Vergata
Field of study
  • Material Science

Publications

Publications (26)
Article
Full-text available
The accurate assessment of creep rupture limit is an important issue for industrial components under combined action of cyclic thermal and mechanical loading. This paper proposes a new creep rupture assessment method under the Linear Matching Method framework, where the creep rupture limit is evaluated through an extended shakedown analysis using t...
Article
Metal Matrix Composite (MMC) represents a valuable option as structural material for different type of structures and components. Despite this they struggle to become widely adopted due to expensive manufacturing process and complex microstructural behaviour. When subjected to cyclic load conditions the structural response of MMC is not trivial, an...
Article
Full-text available
As the energy demand increases the power industry has to enhance both efficiency and environmental sustainability of power plants by increasing the operating temperature. The accurate creep fatigue life assessment is important for the safe operation and design of current and future power plant stations. This paper proposes a practical creep fatigue...
Article
Full-text available
In this paper, the extended Direct Steady Cyclic Analysis method (eDSCA) within the Linear Matching Method Framework (LMMF) is combined with the Stress Modified Ductility Exhaustion method and the modified Cavity Growth Factor (CGF) for the first time. This new procedure is used to systematically investigate the effect of several load parameters in...
Article
Full-text available
This study details the development and validation of a finite element methodology to robustly simulate the inertia friction welding (IFW) process. There are many difficulties involved in modelling IFW. These include the short and violent process to complete a weld, as well as the challenges in obtaining experimental data throughout the process to c...
Article
For the preservation of painted cultural heritage on wooden substrates, it is important to understand the fracture mechanisms in the multilayer system of which they are constructed and how the environment plays a role in the composites’ physical properties. Past research has investigated the material response of each constituent layer but much more...
Chapter
Full-text available
Life integrity assessment of industrial components often requires investigations of the cyclic inelastic response at a range of operating temperatures. Some high strength steels exhibit a well-known ambient temperature creep behaviour, which can also impact the cyclic behaviour, especially under long-term operation. In this study, a direct method k...
Article
Structural integrity plays an important role in any industrial activity, due to its capability of assessing complex systems against sudden and unpredicted failures. The work here presented investigates an unexpected new mechanism occurring in structures subjected to monotonic and cyclic loading at high temperature creep condition. An unexpected acc...
Chapter
Most industrial structures are affected by material mismatch effects, due to the design necessity that leads to the use of dissimilar materials like welding of different parts. In other circumstances, this mismatch is introduced by material transformation like radiation embrittlement, hydrogen attack or carburisation, which can drastically change t...
Conference Paper
The preliminary design of the international space mission HECATE (Human Exploration of Cis-lunar space via Assets Tele-operated from EML2) is briefly discussed. HECATE aims at exploring the far side of the Moon via tele-robotic activities during the 2020s and with the objective to establish human presence in cis-lunar space, following the current v...
Article
An aluminium (Al, 2024T3) matrix composite reinforced with continuous alumina (Al2O3) fibres is investigated under tensile off-axis constant macro stress and thermal cyclic loading. The micromechanical approach to modelling and three different fibre cross-section geometries have been employed. The effect of creep is included by considering three dw...
Article
Ratcheting and low cycle fatigue are failure mechanisms observed in components subjected to cyclic temperature and mechanical loads. Ratcheting is a global failure mechanism which leads to an incremental plastic collapse of the component whereas low cycle fatigue is a localized mechanism which leads to crack initiation. It is exacerbated by grooves...
Conference Paper
Full-text available
This paper introduces the latest research and development of the Linear Matching Method (LMM) on the creep fatigue damage assessment of components subjected to high temperature and cyclic load conditions. The method varies from existing rule-based approaches in both the ASME Boiler and Pressure Vessel Code (NH) and the UK R5 high temperature assess...
Article
Full-text available
The LMM subroutines and plug-in tools for structural integrity assessment are now in extensive use in industries for the design and routine assessment of power plant components. This paper presents a detailed review and case study of the current state-of-the art LMM direct methods applied to the structural integrity assessment. The focus is on the...
Article
Full-text available
This paper presents the preliminary design of the international space mission HECATE (Human Exploration of Cis-lunar space via Assets Tele-operated from EML-2), aimed at exploring the far side of the Moon via telerobotic activities during the 2020s. The exploration is realized by astronauts from HOPE (Human Orbiting Protected Environment), a space...
Article
Full-text available
This paper investigates the cyclic plastic behavior of continuous fiber-reinforced aluminum matrix composites (CFAMCs) with different shape of fiber cross section arranged in a square packing geometry. The 2D micromechanical FEM models, composed of elastic undamaged reinforcement perfectly bonded to an elastic-perfectly plastic matrix with a volume...
Conference Paper
Full-text available
The Linear Matching Method Framework (LMMF) consists of a number of simplified direct methods for generating approximate inelastic solutions and answering specific design related issues in pressure vessel design codes using standard finite element codes. Currently, all the LMM procedures have been implemented in ABAQUS through user subroutines with...
Article
Full-text available
The mechanical behaviour of Metal Matrix Composites (MMCs) subjected to a high temperature and cyclic load condition is difficult to understand. The significantly differing coefficients of thermal expansion between ceramic and metal give rise to micro thermal stresses. Their performance under varying load and high temperature is complex and inconsi...
Poster
Full-text available
This poster presents the preliminary design of the international space mission HECATE (Human Exploration of Cis-lunar space via Assets Tele-operated from EML-2), aimed at exploring the far side of the Moon via tele-robotic activities during the 2020s. The mission will deliver a habitat (HOPE, Human Orbiting Protected Environment) in cis-lunar space...
Article
Full-text available
The accurate assessment of creep fatigue interaction is an important issue for industrial components operating with large cyclic thermal and mechanical loading. This paper proposes a comprehensive overview of the important behaviours that limit the life of components, including cyclically enhanced creep, creep enhanced plasticity and creep ratchett...
Conference Paper
Full-text available
The main purpose of this work is to present the results obtained by the Structural Design and Life Assessment Research Group on the plastic and creep structural response of Metal Matrix Composite (MMC) using the Linear Matching Method (LMM). Throughout the literature different approaches for modelling fibre or particles reinforced aluminium alloy M...
Article
Full-text available
Typical square solar-sail design is characterised by a central hub with four-quadrant sails, conferring to the spacecraft the classical X-configuration. One of the critical aspects related to this architecture is due to the large deformations of both membrane and booms, which leads to a reduction of the performance of the sailcraft in terms of thru...
Article
Full-text available
In this work we investigated the stability behavior and the folding capability of an ultrathin tubular composite boom with C-cross section to be used in nanosatellites applications. A nonlinear buckling analysis was performed using the Riks method, adopting a perturbed finite element model to study the influence of the unavoidable geometrical varia...
Article
Nowadays the interest in nano-satellites and microsatellites is rapidly growing, and with that the design of thinner and stiffer booms becomes an emerging topic. Satellites and deep space probes often need long structures to keep instrumentations far from other satellite components or simply to stabilize low orbit spacecrafts via gravity gradient....

Questions

Questions (8)
Question
Dear all,
I am developing and deubugging a UMAT visco elastic subroutine. I corrected most of the bugs related to it, but I am finding a bit difficult to correct the following issue. This routine requires a trial stress to be used to initiate an iterative solving process. My issue is that at the start this is zero and if I do not provide any stress this would not solve anything since after first increment, with everything to zero, the next one will have lot of zero divisions and this is not admissible.
Do you have any advice on how to deal with this issue? Maybe I am missing something really fundamental?
Thank you in advance.
Question
Dear all,
I have realised a framework of Fortran subroutines and python ( for subsequent model generation from deformed shape and mapping solution) scripts to perform a complex simulation that involves the use of *FRIC, *UEL, *UHARD and *USDFLD, plus several python scripts. Results obtained so far are excellent and match neatly experiment. However, since I started to use more than 1 core I started to have, in a random way, a fatal error during the remeshing and solution mapping. I say this because I got a the error while operating pre.exe and because the .dat file is truncated just before starting the solution mapping starts. I am trying different things but nothing seems to help. In addition, I am quite confident this is due to cores number because when I use a single core I can solve the simulation. The error message is here below if you have any idea I am happy to try.
Thank you!
ERROR: file: G:\R419\BSF\SMABase\SMABasOmni.m\src\omn_CrashHandler.cpp line: 588*** Error: pre.exe / rank 0 / thread 0 encounted an EXCEPTION_ACCESS_VIOLATION (code 3221225477)(null) ABQSMAIomCore.dll admC_File::CheckOut ABQSMAAncAdbModule.dll adb_File::GetMetadata ABQSMAAncAdbModule.dll adb_File::RetrievePackage ABQSMAAncAdbModule.dll adb_BytePackage::adb_BytePackage ABQSMAAncAdbModule.dll adb_GPackage::adb_GPackage ABQSMAAncAdbModule.dll adb_FramePackage::RebootFrameRetrieve ABQSMAAncAdbModule.dll adb_FramePackageHandler::RetrieveFrame1 ABQSMAAncAdbModule.dll adb_FramePackageHandler::RetrieveFrame ABQSMAStsMapSoln.dll map_Model_odb::map_Model_odb ABQSMAPreCore.dll mapstate ABQSMAPreCore.dll pre ABQSMAPreCore.dll pre_main pre.exe ??? pre.exe ??? pre.exe BasicLicenser::EndLongTransaction KERNEL32.DLL BaseThreadInitThunk ntdll.dll RtlUserThreadStart
31/01/2019 21:29:53 Abaqus Error: The executable pre.exe aborted with system error code 1073741819. Please check the .dat, .msg, and .sta files for error messages if the files exist. If there are no error messages and you cannot resolve the problem, please run the command "abaqus job=support information=support" to report and save your system information. Use the same command to run Abaqus that you used when the problem occurred. Please contact your local Abaqus support office and send them the input file, the file support.log which you just created, the executable name, and the error code.
Question
Dear all,
I am a nearly 8 year Abaqus user, and I never see this happening.
Essentially I am scripting a UMAT in Abaqus 6.17 and I have done this exact same scripting in Abaqus 6.12.3 without any issue.
When I read the results from the odb, the simulation is properly completed, all SDV are computed but once I scroll down to see over sdv 11 at sdv12 it returns to sdv1. Now the issue is that if I try to output the values of sdv12 at any element they are there! So this mean the subroutine is working, and results are correct. However, I cannot see these on the contour and wont let me plot the sdv12 contour. This happen also for other sdvs like sdv 201 etc. If I start to scroll the sdvs from sdv 13 it will show the contour but again it will fail at some point. Does anyone had similar experience? I have the fear some bugs in Abaqus 6.17.
Many thanks for any tip!
Question
Dear all,
I am facing some difficulties with this last release, and I would like to ask few question to some users who are using the 2017.
1. I would like to set up the proper ABA_ACCELERATOR_TYPE to use the GPGPU acceleration. As suggested by the Monitor and by the documentation I went in the proper folder "solvers_install_dir/os/SMA/site/ " to find out the abaqus_v6.env file. Well it is not there! Do you have the same issue? Probably I will ask to the IT to re-install again it but to me is not normal to have this file missing.
2. Do you mind to share with me your abaqs_v6.env file? In this case I can check how it looks like and maybe I can avoid to re-install everything.
3. Did someone tested the GPGPU acceleration? How does it works in terms of acceleration? Which GPU you consider the best compromise between cost and computational acceleration?
Thank you all for your replies,
Kind regards
Daniele

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Projects

Projects (4)
Archived project
HECATE is the winning team of the ESA Moon Challenge! Project Statement: Team HECATE will deliver a habitat (HOPE, Human Orbiting Protected Environment) in cis-lunar space during the years 2022-2024 to help a crew of 3 astronauts perform tele-robotic exploration on the lunar surface, conduct human-assisted scientific experiment and sample return of lunar surface material, 3D printing, deployment and testing of low frequency telescope and execute site reconnaissance for future human exploration of the Moon. HOPE will also be utilized as a platform for future deep space exploration. The work done on HOPE has been submitted to Acta Futura, an ESA journal on multidisciplinary research topics of potential interest in the long term for space science.
Project
The primary objective of the research project is to develop a robust computational model to simulate rotary friction welding (RFW) of aerospace materials. RFW is an advanced solid-state joining process used by Rolls-Royce (a pre-eminent engineering company and the industrial project partner) to weld jet engine components made from sophisticated nickel-based superalloys. Nickel-based superalloys are aerospace materials that exhibit exceptional mechanical properties and corrosion resistance at the very high operating temperatures found in jet-engines. The objective of this project is to develop a predictive macroscopic modelling framework for RFW of aerospace materials. The model will be solved approximately using the finite element method and will account for the complex and coupled physical processes that characterise RFW. The model will be validated using extensive experiments currently been performed at the Materials Research Group of the University of Glasgow. This project is part of a larger one on materials design and production processes for the next generation of aerospace materials. The project team includes engineers from Rolls-Royce, and researchers and students from other participating universities in the UK.
Project
The "Elevated Temperature Design and Life Assessment Procedures" mentioned involve multiple competing damage / failure mechanisms and multiple loading types but always include creep. If it does not include creep I'm not working on it. This is a very big objective and one that could only be achieved by working collaboratively with a large number of academic and industrial researchers. The keys to success in such a massive objective are (i) making small incremental improvements one by one and (ii) ensuring that the work that my collaborators are doing overlaps enough with the existing procedures that their research can be applied as one of the next incremental improvements. If you have read this and you want to collaborate then ask yourself; "how does my research contribute an incremental improvement to an existing design or life assessment procedure?" Then get in contact with me.