Laminate load response

Laminate loads consist of external mechanical loads and internal thermal or hygroscopic loads. In order to solve real-world problems, COMPOSITE STAR defines a constant and a variable load. Typically the constant load is a preload (e.g. thermal loads resulting from curing, an external static mechanical load). The variable load is used to define a dynamic external mechanical load. This permits the calculation of the extent to which the dynamic external load can be increased until failure occurs.

Failure criteria

COMPOSITE STAR uses the ply-by-ply failure analysis in its most modern and advanced form. Besides the standard failure criteria (maximum stress, maximum strain, simple Puck, modified Puck, Tsai-Hill, Tsai-Wu, Hoffman, Hashin), COMPOSITE STAR introduces one of the world's most detailed and sophisticated interactive criterion, Puck's action plane criterion. This criterion distinguishes between the different fracture modes (tensile and compressive fiber-fracture, tensile, shear and compressive inter fiber fracture), calculates the fracture plane angle for inter-fiber fracture and can predict catastrophic wedge effects.

laminate results
fracture modes

Simulation of the failure process

Progressive failure analysis allows strength prediction after first ply failure. COMPOSITE STAR offers progressive failure calculation according to Tsai or the failure process and non-linear ply degradation model from Puck. The load will be increased step by step. If a failure occurs, the corresponding ply will be degraded and the new resulting laminate with the new stress and strain distribution will be calculated. All laminate properties, stresses and strains can be observed at every important moment of the load increase. Consequently, the progressive failure calculation results in a real simulation of the failure process.

The graph engine

COMPOSITE STAR's sophisticated graph engine allows the display of any X-Y or polar graph, including any ply property versus the ply's orientation angle, carpet plots, ply-by-ply stress and strain diagrams and failure process diagrams.

The material database

COMPOSITE STAR stores all data in a state-of-the-art, full-featured database. The database stores the data of fibers, matrices, plies, laminates, stacking sequences, loads and structures.

carpet plot
polar diagram

The user interface

The quality and efficiency of software is only as good as its user interface. Therefore, great importance has been placed on the calculation and database user interface. The different database tables are shown as grids. As with the so efficient spreadsheet programs, the user can change any value at any time and press one single calculation button, which will update all calculations results instantly. Although very sophisticated, the software can be used intuitively without complicated menus, windows or dialogs. Every function is just a mouse-click away.