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Journal Club Theme of February 2016: Deformation Mechanics of Granular Materials: Local Deformation of Polymer-bonded Sugar at High Strain Rate Loading

Deformation Mechanics of Granular Materials:

Local deformation of Polymer-bonded sugar at high strain rate loading

 Addis Kidane, Suraj Ravindran

Department of Mechanical Engineering, University of South Carolina, 300 Main Street, Columbia, SC 29208



UMAT and VUMAT Subroutines for GTN Model

Hi Friends,


                I want to implement GTN damage model in abaqus/Explicit and Standard analysis. Is there any example tutorial or avaliable material. Please forward to me. 



Vinod Kumar

Damage Failure Model Data for Modified 9Cr-1Mo Steel

Can anyone know the data for the following (Johnson Cook Failure Model)

J.C. Damage Constant parameters (d1, d2, d3, d4, d5) , Transition Temperature Melting temperature and strain rate constants

zichen's picture

Mechanical Self-Assembly of a Strain-Engineered Flexible Layer: Wrinkling, Rolling, and Twisting

Self-shaping of curved structures, especially those involving flexible thin layers, is attracting increasing attention because of their broad potential applications in, e.g., nanoelectromechanical andmicroelectromechanical systems, sensors, artificial skins, stretchable electronics, robotics, and drug delivery.

Material Jacobian in UMAT





Mechanics of Cosserat Media

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We are trying to find out the work conjugate strain (and wryness) measures to T and M (stess and couple stress) and we know that in classical theory the conjugate strain measure is identified using the stress power, which appears in the power balance equation derived taking the inner product of the equation of motion with velocity. Please refer to the attached pdf for details.

1.  Given the equations of motion of Cosserat media (Eq 1 and 2 in attached pdf) how do we extend the procedure of calculating the stress power for Cosserat media?

Yonggang Huang's picture

JAM in 2015

Thanks to the efforts of the associate editors and reviewers, JAM continues to publish very fast.  Among ~800 submissions in 2015, there are only 19 papers that are still under review as of February 1, 2016.  In addition, the acceptance rate continues to decline, to ~16% in 2015. 



Amit Pandey's picture

Thermo-mechanical response: Role of Porosity and Microcracking (in particular)

Below are references to some of our ongoing work that is published and is related to study the role of microcracking (in particular) and porosity to the thermo-mechanical response of functional ceramics. This study is  relevant to understand the structural reliability of the systems such as the SOFC's (solid oxide fuel cells) and DPF's (diesel particulate filters).

Flavio Stochino's picture

Sardinia radio telescope finite element model updating by means of photogrammetric measurements

 The 64 m diameter Sardinia Radio Telescope (SRT), located near Cagliari (Italy), is the world’s second largest fully steerable radio telescope with an active surface. Among its peculiarities is the capability of modifying the configuration of the primary mirror surface by means of electromechanical actuators. This capability enables, within a fixed range, balancing of the deformation caused by external loads.

mmalekan's picture

How to calculate Stress intensity factor through FE programming?

Dear all,

I need to calculate SIF through a FEM program by writing some line of codes. The problem is that I wasn't able to find a reference contains straightforward formulation and procedure for this. Can anybody help me please with this issue?



bilelsandel's picture

intrested in topology and structural optimization ? lets collaborate ...

i discover a new research field, topology optimization, i want work with 'matlabophiles' to make great things with this method....sure its gonna be successful

zhan-sheng guo's picture

Heat seal properties of polymer–aluminum–polymer composite films for application in pouch lithium-ion battery

Polymer–metal–polymer composite films are widely used in packaging, building, and cooling, and more recently as envelopes for pouch lithium-ion batteries (LIBs). The influences of heat seal temperature and dwell time on the heat seal strength (HSS) of five different multilayer films were investigated by T-peel testing. The failure modes were observed and analyzed by digital optical microscopy. Heat-sealing temperature and dwell time interacted and simultaneously influenced the HSS. Temperature was confirmed as the primary factor while dwell time was secondary.

Write out local material orientation

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I have set up a vibration problem. I assign a local material orientation by assigning coordinates a and b to define the 3rd material direction. From documentation, I understand that the other two directions are assigned to be orthotropic to the 3rd direction. Beyond that, I think that they are set somewhat arbitrarily. I want to output each component of the local material orientation.

ahmedettaf's picture

Transfer printing enabled soft composite films for tunable surface topography

Transfer printing, an emerging manufacturing technique for heterogeneous material integration, is combined with the unique mechanics of soft composite films to realize a responsive surface for tunable topography in this work. Soft composite films are fabricated by transfer printing thin silicon ribbons on elastomeric films in a staggered manner. The corrugation formation in soft composite films requires a well-organized spatial distribution of the silicon ribbons which is enabled by transfer printing processes developed here.

Wenbin Yu's picture

Micromechanics Simulation Challenge

cdmHUB has completed the level I micromechanics simulation challenge. Several micromechanics methods/tools including both commercially available tools such as  Altair MDS, ESI VPS, Digimat, SwiftComp and research codes such as MAC/GMC/HFGMC and FVDAM, are used to analyze six typical 2D/3D microstructures.

How to link gfortran with Abaqus6.14 ?

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Dear Abaqus Experts:


I am new Subroutine user and I want to analyze plastic deformation behavior of micro component.

So, I have to link Abaqus,gfortran,and Microsoft Visual Studio.

I tried several methods by reference to the following link,but I have not yet been successful in them.

Antonino Favata's picture

Graphene and Carbon Nanotubes are self-stressed

In the attached paper we have shown that graphene and carbon nanotubes are in a self-stress state in their natural equilibrium state, that is, the state prior to the application of external loads. We have identified different sources of self-stresses and accurately evaluated them; we have shown that they are by no means negligible with respect to load-related nanostresses.

baijatnal's picture

how to simulate projectile motion using abaqus

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I want to simulate a problem in which a ball placed over a spring plate or elastic plate is fired at an angle to travel maximum distance. Can anybody help me how to simulate this.I have the plates's height of 180mm and I need to find the angle and maximum distance of travel.
Suppose I have vertical Cantilever Plate(say 100mm height) with a ball in contact on the top and I apply a load of 100N to bend the two and release it from that bent position or angular position. I need to calculate the best angle of projection and maximum distance travelled. Can anybody help me now

ghanshyampal78's picture

Modeling of carbon nanotubes and carbon nanotube–polymer composites


-    In polymer matrix nanocomposites (PNC), carbon nanotubes (CNT) physically bond with polymeric matrix at a level where the assumption of continuum level interactions is not applicable.

-    Modeling and prediction of mechanical response and failure behavior of CNTs and PNCs becomes a task involving up-scale modeling strategies with multiple spatial and temporal scales in hierarchical or concurrent manner.


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