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Stress-Life Fatigue Testing Basics

ADMET CEO and Chief Engineer Richard Gedney's article on fatigue testing applications was published on the Quality Magazine August 2017 issue. 

The article starts with brief descriptions of the four stages of metal fatigue:

Stage 1: Crack Initiation

Stage 2: : Slip Band or Stage 1 Crack Growth

Stage 3: Stage II Crack Growth

Stage 4: Ductile Failure 

Abaqus Python : reading odb file for field frame data

Hi,

I am running a python script to do some post processing on Abaqus odb file. While running it on Abaqus/Explicite output file I found it was taking more than usual time. And after timing the run I got the surprise that the most time consuming thing what just to read the time value for each frame. I have the script below.

def main():

odb=openOdb('F:/Scripting/.../.../Example.odb') 

Xuesen Zeng's picture

PhD Scholarship Available at USQ Australia

Research Topic – Manufacture of Aerospace Structures using Automated Fibre Placement.

Ph.D. Student Positions in Computational Materials Science and Mechanics

Several Ph.D. student positions are available in phase field and mesoscale plasticity areas at Purdue University’s School of Materials Engineering. In addition to meeting all admission requirements, the ideal student would be one who is theory and computations oriented, with background in Fortran 90 and/or C++ skills and reasonable knowledge in mechanics and microstructure science of materials. Students with M.S. degree in mechanical engineering/mechanics, aerospace engineering/mechanics or in materials modeling and simulations are desirable for these position. To start in January 2018, a prospective domestic student needs to apply by the middle of October and an international student by October 1, 2017. For inquiry, please send email to Professor Anter El-Azab (aelazab@purdue.edu).

Ali Ramazani's picture

A Hybrid Multi-Scale Model of Crystal Plasticity for Handling Stress Concentrations

Microstructural effects become important at regions of stress concentrators such as notches,
cracks and contact surfaces. A multiscale model is presented that efficiently captures microstructural
details at such critical regions. The approach is based on a multiresolution mesh that includes an
explicit microstructure representation at critical regions where stresses are localized. At regions farther
away from the stress concentration, a reduced order model that statistically captures the effect of the

Sandwich plates using Higher order theories

Hi,

While modeling laminated composites we use their material properties (stiffness matrix) to compute the ABD matrix. When E_z of the core is much higher than E_x and E_y, how can we model such a plate using 2D FEM?

Xuesen Zeng's picture

PhD Studentship– Advanced Composite Materials Manufacturing

Department:                  Centre for Future Materials, University of Southern Queensland, Australia

 

Classification:              PhD (Higher degree by research) in the following area

 

Konstantin Volokh's picture

Understanding the strength of bioinspired soft composites

Remarkable mechanical properties of biocomposites (bone, teeth, shell, antler etc.) are usually attributed to their special design where staggered mineral platelets are embedded in a protein matrix. Because of the high aspect ratio of the platelet the soft protein deforms in the shear mode predominantly providing the linkage for the hard inclusions. Mimicking Nature one might design materials with a similar architecture. 

rabedi's picture

PhD position in computational solid / fracture mechanics

Hello,

I have a PhD position available for a project titled "Asynchronous, Parallel-Adaptive Solution of Extreme Multiscale Problems in Seismology" funded by the U.S. National Science Foundation (NSF). The research involves:

a. Formulation of contact / fracture models (interfacial and/or bulk) for seismic applications, e.g. anisotropic, inhomogeneous rock under dynamic loads.

b. Adaptive spacetime time discontinuous Galerkin formulation for the solution of multiphysics PDEs relevant to this application.

c. High performance computing aspects of the method.

PhD Position in Computational Simulations of Materials

A position for PhD student (research assistant) is available in the Department of Mechanical Engineering within the Purdue School of Engineering and Technology at Indiana University–Purdue University Indianapolis (IUPUI). The full-support position is available for Spring 2018 or Fall 2018. The projects are focused on conducting computational simulations of various materials, including atomistic and multiscale simulations.

DEADLINE: September 15th, 2017 | AMD/ASME Awards - Call for nominations 2017

 REMINDER: The deadline for nominations for the AMD/ASME awards is September 15th, 2017.

Information and details on each of the awards are provided below.

---------

ryvkin's picture

Postdoc/PhD position in Computational (solid and structural) Mechanics in Tel Aviv University

Recently developed mathematical tools based on the discrete Fourier transform will enable modeling of fracture phenomenon in materials with periodic hierarchical microstructure.

The postdoc position is for one or two years, and PhD is a usual Phd program.  More info on the project is in attached file.

Postdoc in solid mechanics, particularly paper mechanics

KTH Royal Institute of Technology in Stockholm has grown to become one of Europe’s leading technical and engineering universities, as well as a key centre of intellectual talent and innovation. We are Sweden’s largest technical research and learning institution and home to students, researchers and faculty from around the world. Our research and education covers a wide area including natural sciences and all branches of engineering, as well as in architecture, industrial management, urban planning, history and philosophy.

Xuesen Zeng's picture

Full PhD scholarship available - composite material modelling at University of Southern Queensland

We are looking for a PhD candidate to work on numerical modelling of composites manufacturing. Automation drives down the production cost in composites manufacturing. The project focus on self-learning process modelling coupled with real-time pressure field monitoring. The integrated virtual-physical approach aims for : (1) real-time prediction of defect formation, and (2) real-time optimisation of process correction parameters. Self-learning process modelling is the enabling technology towards smart factory.

Remuneration

CDM (Crack band theory)

Hi, I am working on Continum damage mechanics based on crack band theory. The damage initiation is based on Hashin-Rotem theory. I am trying to simulate damage in composite laminates.

I need to store crtical values of stress and strains when Hashin-Rotem equations reaches one (when failure initiates). Is any one aware of getting unique value of critical stress and strains ?  

Two positions at the Mechanical Engineering Department at the University of British Columbia

Two positions are open for Ph.D. or Masters students in the Department of Mechanical Engineering at the University of British Columbia, Vancouver, Canada. The positions are joined with the Modeling and Simulation group and the Micro and Nano mechanics laboratory. We are looking for skilled and highly motivated individuals to pursue a Ph.D. or M.A.Sc. in the area of multiscale modeling of materials and solids mechanics. Two projects are available:

Giorgio Carta's picture

Gyro-elastic beams for the vibration reduction of long flexural systems

The paper presents a model of a chiral multi-structure incorporating gyro-elastic beams. Floquet–Bloch waves in periodic chiral systems are investigated in detail, with the emphasis on localization and the formation of standing waves. It is found that gyricity leads to low-frequency standing modes and generation of stop-bands. A design of an earthquake protection system is offered here, as an interesting application of vibration isolation. Theoretical results are accompanied by numerical simulations in the time-harmonic regime.

new postdoc opening at University of Wisconsin-Madison

We invite applications for a post-doctoral researcher position in the general area of computational design. 

Candidates with strong background in isogeometric analysis, finite element analysis, structural optimization, and/or high-performance computing are encouraged to apply.

For additional information, please contact Prof. Xiaoping Qian (qian@engr.wisc.edu). To apply, email your application files (CV, 1-page summary of research accomplishments and research interests, and 3 references).

Postdoc Position (Computational Mechanics) at Idaho National Laboratory

Position: High Performance Particle Numerical Modeling Postdoctoral Research Associate

Location: Idaho Falls, Idaho, United States

Closing Date: Until filled

Contact: Yidong Xia (Yidong.Xia at inl.gov)

Mike Ciavarella's picture

1 phd position for NON-italian citizens at Politecnico di BARI - ITALY. Expires 12 sept

1 phd position for phd is reserved to non-italian citizens at Politecnico department of Mechanical engineering.

Attached the SELECTION CALL FOR ADMISSION TO THE RESEARCH DOCTORATE (Ph.D.) PROGRAMS – XXXIII CYCLE AT THE POLITECNICO DI BARI ACADEMIC YEAR 2017/2018 

Various options for research themes are available, also including solid mechanics, fatigue or contact mechanics.

See attachment or write for details at mciava AT poliba.it

Application expires on Sept.12 !!

PhD position at Boise State University

The Micron School of Materials Science and Engineering at Boise State University is seeking a PhD student to work on projects related to computational materials science. The projects are focused on developing models for microstructural evolution in materials. The applications include functional materials, energy materials, materials under extreme environments, and advanced manufacturing. 

 

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