Blog posts

Following last month’s blog by Mahmoud on the role of structure in the design of materials capable of controlling the propagation of mechanical waves, I would like to delve into the characteristics of the structure itself. The propagation of mechanical waves can be controlled via scattering induced by a material’s structure.The propagation of waves for example is significantly disturbed when their wavelength and direction become correlated with the medium’s structure.

Convergence of Numerical solution may depend on the conditionning of the problem's matrices.

An ill-conditionned matrix produce singulariy cases. This is due to bad shaped elements in

structural mechanics: nearly degenerated elements with zero area (in 2D) or zero volume (in 3D)

The conditionning can be analyzed by numerical algorithms or existing commands in order to

detect these problems.

Sometimes a change of notation can advance thought. In today's blog the tradition of numerals 6,7,8, and 9 will be challenged. 

Suppose the five letters a, b, c, d, and e are used to represent numbers satisfying

a + 1 = 0,  b + 2 = 0,  c + 3 = 0,  d + 4 = 0,  e + 5 = 0.

Respected Sir,

Hi, please help me on the simulation on the orthotropic material in ABAQUS. I have the parameters for the material density=1584;

Ex=127.9e9

Ey=10.27e9

muxy=0.22;

muyx=0.0177;

Gxy=7.312e9;How can i use the orthotropic or engineering constant to simulate the material. I want to calculate frequency for orthotropic plates.



Graphite epoxy plates



Graphite/epoxy consisting of 12 plies oriented at 0 and fabricated from Fiberite

Hy-E1034C prepreg



Thank you for your concern.