A Promising Way to Model Damage in Composite and Dry Fabrics using a Discrete Element Method (DEM)

摘要

A promising way to model fracture mechanics with the use of an originalrnDiscrete Element Method (DEM) is proposed. After proving the ability of thernmethod to capture kinetic damage induced by cracking phenomena in brittlernmaterials such as silica [1], taking advantage of the method for composite materialsrnapplications is the main purpose of this work. This paper highlights recentrndevelopments to prove capabilities of the DEM and to give some answers tornchallenges : i) use the present DEM to model damage mechanisms (matrixrncracking, debonding, fiber break and delamination) in a composite material ii) dealrnwith impact applications using the DEM. All developments are made in the homernmade software GRANOO (GRANular Objet Oriented) [2]. The capability of thernDEM to model matrix cracking, debonding and fiber break is first demonstrated onrna so-called representative elementary volume (REV) made of a fiber flooded in arnmatrix. Modelize the REV with DEM and retrieve suitable homogenized propertiesrnis the first challenge reached. Secondly, the ability of the method to capture matrixrncracking, debonding and fiber break is qualitatively demonstrated through basicrnstatic simulations performed on the REV. The ongoing developments to improvernare presented. Then, the Double Cantilever Beam (DCB) test using DiscreternElement (DE) is investigated. Contact cohesive laws are identified fromrnexperiments and implemented in GRANOO. Simulations of DCB test using DEMrnare then performed. Results are discussed and ways of improvements are proposed.rnFinally, the ability of the DEM to simulate impact damage on textile is pointed out.rnNumerical investigations are based on Ha-Minh & co. Works in [3, 4] taken forrnreference. The weaving is exactly reproduced with DE. The contact between yarnsrnis naturally taken into account in the DEM. The promising results are commentedrnand the on going developments are exposed.