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Stress rate for Johnson-Cook material model

Submitted by Monica Dhinde on
objective stress rate

I am using Johnson-Cook material model to simulate foam response, but am confused about which stress rate definition the material model uses. The manual mentions that Abaqus/Explicit uses Green-Naghdi stress rate for viscoelastic materials, but the Johnson-Cook model definition shows viscoplastic behavior, while the elasticity limi depends on the strain rate. Thus I am confuesd if Abaqus/Explicit uses Jaumann or Green-Naghdi stress rate for Johnson-Cook material model. Can someone please guide me,

Stress rate for Johnson-Cook material model

Submitted by Monica Dhinde on
objective stress rate

I am using Johnson-Cook material model to simulate foam response, but am confused about which stress rate definition the material model uses. The manual mentions that Abaqus/Explicit uses Green-Naghdi stress rate for viscoelastic materials, but the Johnson-Cook model definition shows viscoplastic behavior, while the elasticity limi depends on the strain rate. Thus I am confuesd if Abaqus/Explicit uses Jaumann or Green-Naghdi stress rate for Johnson-Cook material model. Can someone please guide me,

Bulk and fracture process zone contribution to the rate-dependent adhesion amplification in viscoelastic broad-band materials

Submitted by Antonio Papangelo on
research

The contact between a rigid Hertzian indenter and an adhesive broad-band viscoelastic substrate is considered. The material behavior is described by a modified power law model, which is characterized by only four parameters, the glassy and rubbery elastic moduli, a characteristic exponent n and a timescale tau0.

Postdoctoral fellow, Ph.D. students, master students, and visiting students/researchers positions at KAIST

Submitted by Sung Hoon Kang on
job
postdoctoral position
PHD position
MS position
visiting student/researcher
KAIST
bioinspired engineering
extreme materials
Kang group

The Kang Group for Bioinspired Extreme Materials is looking for outstanding candidates to join the group. We have openings as below. Due to the large volume of applications received, we will contact only those selected for interviews. Thank you for your understanding.


Postdoctoral Fellow

One postdoctoral fellow position is available in the area of bioinspired materials with focus on experimental aspects. 

Tenure-track Assistant / Associate Professor Positions in the field of “Renewable Energy Technologies"

Submitted by info@signatur.dk on
job
Renewable Energy
#mechanics #thermodynamics

The Department of Mechanical and Production Engineering (MPE) at Aarhus University is expanding its research and teaching activities in the field of “Renewable Energy Technologies” and invites applications for two Tenure-track Assistant / Associate Professor positions within the Section of “Fluids and Energy”.

Tenure-track Assistant / Associate Professor in the field of “CO2 capture or conversion”

Submitted by info@signatur.dk on
job
#mechanics #thermodynamics
academic job search - Fluid Mechanics

The Department of Mechanical and Production Engineering (MPE) at Aarhus University is expanding its research and teaching activities in the field of “CO2 capture or conversion” and invites applications for Tenure-track Assistant / Associate Professor position within the Section of “Fluids and Energy”.

PhD openings in Computational Solid Mechanics and Methods at University of Kentucky

Submitted by H.Chen on
job

The Computational Mechanics and Methods (CM3) Group in the Department of Mechanical and Aerospace Engineering at the University of Kentucky is seeking highly self-motivated individuals who have great interest in the broad research areas of computational solid mechanics and methods, beginning either Spring 2025 or Fall 2025. Interested individuals should send a detailed CV and official transcripts to Dr.

Rigidity theory meets homogenization: How periodic surfaces bend

Submitted by nassarh on
research
rigidity theory
compliant shells
homogenization

In differential geometry, rigidity theory investigates whether a surface can deform by pure bending without stretching. The central problem is to find or disprove the existence of isometric deformations.

Classical examples in the "discrete" category include:

  • The finite rigidity of convex polyhedra by Cauchy
  • The infinitesimal rigidity of convex polyhedra by Dehn
  • The existence of flexible (non-convex) polyhedra by Connelly

In the "smooth" category, we have:

postdoc in structural mechanics at Johns Hopkins

Submitted by Feng Zhu on
job

We are looking for a Postdoc Fellow in the area of structural mechanics (4D printed morphing structures). The successful candidate will work in Hopkins Extreme Materials Institute (HEMI), Johns Hopkins University on a fully funded research project.

Duties
• Design, fabricate and conduct mechanical tests and numerical simulations on morphing structures with programmable materials such as shape memory polymer or other similar materials
• Write technical reports, papers and research proposals
• Guide the graduate students in the group

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