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Failure Envelope
A finite element software computes the stresses and/or strains sets values at each dynamic iteration step. These values can be plotted on a stress-space giving several failure envelopes. For an isotropic or an homogeneous mixture the Von Mises criterion represents an ideal envelope which may not coincide with the available envelopes but the stresses values can be checked with the material strength.
How to use rule-of-mixtures in order to obtain mechanical properties of bidirectional composites?
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Dear all,
We are easily able to obtain mechanical properties (such as elastic modulus, Poisson's ratio and ...) of a unidirectional lamina composite by means of rule-of-mixture.
For instance, in case of "longitudinal loading", strength of the fiber-reinforced composite for long continuous fibers will be like:
Ec=Ef*Vf+Em*Vm.
I have two main questions:
First, are these relations (longitudinal and transverse loading) hold for bidirectional composite? if not, how can we obtain relative elastic modulus?
The Mechanical Laboratory of Sousse Scientific Workshop
The Mechanical Laboratory of Sousse (LMS) of the National School of Engineers of Sousse intends to organize annual scientific workshop on one of the four research themes identified by the laboratory teams. This first Workshop is proposed by the LMS team: “Fatigue of Materials and Structures”. The proposed theme is ” Mechanical performance of materials: From experiments to predictive approaches”.
The Mechanical Laboratory of Sousse Scientific Workshop
The Mechanical Laboratory of Sousse (LMS) of the National School of Engineers of Sousse intends to organize annual scientific workshop on one of the four research themes identified by the laboratory teams. This first Workshop is proposed by the LMS team: “Fatigue of Materials and Structures”. The proposed theme is ” Mechanical performance of materials: From experiments to predictive approaches”.
How to develop a new constitutive model from scratch?
Dear all iMechanica,
I wonder if there is any good material on constitutive modeling that explains how to develop a new constitutive model from scratch, e.g. from the experimental data say uniaxial tension and compression. Where should one start to develop a new constitutive model? What laws should the model obey?
How to use non-dimensional form in open source codes instead of Units
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I am using an open source FEM platform, which requires you to convert your equation system to non-dimensional form. So, there are no units specified for the parameters in the problem. If you use compatible input units, you should expect the output in matching unit - just like one would do in a normal python or C++ code for solving physical problems. I have an elasto-plastic dynamic problem to solve, and these are the parameters for the Drucker-Prager Soil Model for soft clay.
E = 5000000; // Young's Modulus in N/m^2 or Pa
Problem between diaphragm and embeded region in ABAQUS
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Hello every one,
I am modeling a core (C shape) subjected to lateral load. I used embeded region constraint to contact steel bars and stirrups to the solid core. Then i want to apply the load at one end of core, but i need to contact all points in this end with a diaphragm to take the effect of the slab which aren't modeled. But i thing that ABAQUS doesn't permit to use two constraints at the same point. So what can i do to constrain the steel bars to core and also to constrain all points at one end with a diaphragm.
Thanks in advance
Rectangular frame calculation by beam finite elements
Beam elements are very widely used in structural engineering. Here we consider the methodology for calculating the rectangular frames with articulated or rigid nodes. The load is evenly distributed and concentrated. The result is exactly the same with the results of the method of force and displacement method. A practical example of the calculation of the frame. The input data for the program will be the number of items and the number of degrees of freedom, geometrical and physical characteristics as well as the degrees of freedom of information for each item.