These notes were prepared when I taught fracture mechanics in 2010, and were updated when I taught the course again in 2014.

Notes on other parts of the course are also online.

I have a question regarding Gurson model. If we have a cube with initial length of unit and initial porosity of 20 percent and compress it hydrostatically in order to have a huge volume change of cube, the void growth equation in Gurson model takes a negative rate and reduces the void volume fraction to zero first and further compressing leads to no further void volume fraction change (remains zero) and no more plastic straining. Now let's load the model in tensile hydrostatic state up to a stress free configuration; the void volume fraction of the model remains zero.

The Graduate School MUSIC ("Multiscale Methods for Interface Coupling") and the

Institute of Continuum Mechanics at Leibniz Universität Hannover invites

applications for a position as a

Research Staff Member in Computational Mechanics

(Salary scale E13 TV-L)

to be appointed on 1 April 2010.

The position is embedded into the Junior Research Group on „Multiscale Modelling of

Materials and Interfaces with Size Effects” and is initially limited to 1 year.

I´m facing a problem in which a I´d like to assess stresses due to thermal gradients. I have an IR thermography image (recorded as a matrix) and I like to introduce those temperatures to Abaqus via Matlab.

Is that possible? Or should I use FORTRAN with the UTEMP subroutine?

Thanks in advance,

Aitor  

Hi

Please help in modeling the soil.

I  modelled soil as non linear springs in Abaqus?Standarads and analysed the pipe behavior for hydrodynamic loading.

I am currently planned to model the pipe-soil interaction with soil as an 2D or 3D element along with contact properties. Give me suggestion or methods how can i model soil.Suggested reading materials.I have gone through the abaqus documentation.It tell that soil can be modeled as 2D or 3D.I am really confused which one to use. 

Please give me some steps in creating soil and pipe model .

The interfacial strength is a very important material property for composite materials and other hybrid materials with different stress distributions. Will the interfacial stress distribution have a significant effect on the interfacial strength measurement?

A PhD position is available in the area of computational multiscale modeling of engineering materials in the Department of Materials Science and Engineering in the College of Engineering at University of North Texas (UNT). Financial support will be provided through research assistantship. The student will participate in research activities to study material defects, microstructure evolution, and mechanical behavior of crystalline metals, alloys, and nano-composites for a wide range of important applications in areas such as energy and aerospace.

Dear Colleagues,



Let us continue viewing the efficiency of the application of various optimization methods on practical optimization problems.

The study of cellular solids is greatly influenced by the honeycomb. However, the honeycomb is not a component as whole for bees. Instead, the bee only care the shape and mechanical property of the cells, but in the engineering field, a cell of honeycomb is seldom used. We use them as plate, shell and so on. I think we ignore another porous material called cocoons, the protection to the most fragile period of insects. It is always bearing the load as a whole component.

Mechanics community,

Please find attached the spring 2010 edition of the ASME Committee on Constitutive Equations Newsletter. Included in the newsletter are short articles on "Constitutive Modeling of Skeletal Muscle Tissue" and "Nonlocal Modeling of Materials".

Thanks,

Greg Odegard