User:Ebarbero/sandbox

cadec-online.com is a cloud computing application that performs analysis of composite materials. Inspired on the earlier, installable, desktop application software that has been evolving since 1998, this release is completely revised, with expanded functionality, and implemented online. Cloud computing means that updates are transparent--no new releases have to be installed by the user. Instead, new functionality appear without disruptions. Data integrity allows users to refine the properties of any object, such as fiber properties, and the software will automatically and transparently update all the dependent objects, such as laminas, laminates, and beam sections. An encrypted database maintains all of the user’s objects, which are on the cloud, available everywhere. The application is used primarily for teaching,.

Micromechanics
Micromechanics for composites reinforced with unidirectional fibers, and random fibers, as well as plain weave, twill, and satin textile fabrics. Predicted properties include lamina elastic moduli, strength values, coefficient of thermal expansion (CTE), moisture expansion, etc. There are several theoretical models, each having its advantages and disadvantages, that can be explored, including:


 * Cylindrical assemblage
 * Halpin-Tsai
 * Periodic microstructure model (PMM)
 * Rule of mixtures (ROM, Woldemar Voigt (1887)) and the inverse ROM (A. Reuss (1929) )
 * Stress partitioning

Lamina analysis
Lamina analysis uses the lamina material properties calculated with micromechanics to build the three dimensional (3D) stiffness and compliance matrices. From them, it builds the two dimensional (2D) reduced stiffness and compliance matrices, in lamina coordinate system (cs). Lamina analysis is able to transform these matrices to any other coordinate system. This is necessary since laminated composites are often manufactured using several orientations. Lamina types include:
 * Unidirectional. The lamina properties are calculated using micromechanics
 * Random, continuous/chopped strand mat. The lamina properties are calculated using micromechanics
 * Fabric/textile. The lamina properties are calculated using micromechanics
 * Experimental. The lamina properties are given by the user, based on testing or material supplier data

Laminate analysis
Laminate analysis capabilities include calculation of laminate stiffness, stress, strain, and failure. Installable application software with laminate analysis capabilities are listed in, , etc. Laminate analysis can be performed on intact and degraded laminates. The intact material is the undamaged, virgin material, with properties specified by the user. After certain load, which can be predicted in failure analysis, the laminate damages and becomes degraded. For each, intact and degraded, the user can query laminate thermal stresses, laminate coefficient of thermal expansion, laminate stiffness matrices for membrane [A], membrane-bending coupling [B], bending [D], and transverse shear [H], as well as their conjugate compliance matrices. With these, the software can calculate stress from user supplied strains or vice versa. Also, the software can predict the laminate moduli, which are orthotropic material equivalents for the stiffness of the laminate in both bending and membrane modes of deformation.

Failure analysis
Failure predictions include first ply failure (FPF) and last ply failure (LPF) under mechanical, thermal, and moisture loads, as well as insitu effects, and several failure criteria (FC), including:


 * Maximum strain
 * Maximum stress
 * Interacting FC
 * Hashin FC ,
 * Puck FC ,
 * Truncated Maximum Strain, and so on.

Textile reinforced composite analysis
The software can predict the stiffness and strength of composite materials reinforced with plain weave, twill, and satin textile, also called fabric. The textile lamina is idealized as a transversely isotropic material. The calculated properties include:


 * Five elastic moduli
 * Seven strength values
 * Two coefficients of thermal expansion
 * Two coefficients of moisture expansion

The calculated textile lamina can be used as any other lamina in the rest of the software.

Thin walled beam analysis
Analysis capabilities exist for laminated composite thin walled beams with general cross sections. Beams can be asymmetric and loaded by general combinations of forces in three planes (axial, vertical and horizontal) as well as by three moments (torque and two bending moments). The software computes all the section properties including the shear center and so on.

Mechanical and environmental loads
Laminates can be loaded by laminate loads, which are membrane, bending, and transverse shear stress resultants. Simultaneously, laminates can be subjected to the environment, represented by temperature and moisture. Thin walled beams can be loaded by beam loads, i.e., three forces (axial, vertical and horizontal), and three moments (torque and two bending moments).

Application programming interface
The application programming interface allows users to access virtually all of the capabilities of the software from other software environments such as Abaqus, Ansys, Matlab, Python, .NET Framework, Mathematica, etc.