Delamination behaviour of composites

Experimental Validation of Composite Structures in Explicit Impact Analysis

“…Following a mesh convergence parametric investigation, each sublaminate is discretized by a finite element mesh consisting of 2 mm x 2 mm square elements and four integration points through-thickness. Equation 2 is used to modify material strengths in order to correspond to the element characteristic length, calculated by Equation 4. The G1157/RTM-6 lamina material properties as well as the intralaminar damage parameters ( Table 1) that are used for the simulation of sublaminates are introduced in the 'Mat 59 Composite Failure' type of the LSDyna code, which is formulated according to the attributes of the elasto-plastic material model described in section 2.1.…”

“…On the other hand, fracture mechanics techniques -e.g. the Virtual Crack Closure Technique (VCCT) or the Cohesive Zone Method (CZM) -treat in-plane and out-of-plane behavior separately, concentrating individually on the progression of interlaminar damage [4]. The VCCT [5] has been applied extensively in the analysis of metals and has been extended to composite materials using the energy release rate concepts to directly predict the crack growth.…”

Experimental investigation on delamination in nanocomposite drilling

“…Hence, the proper choice of these governing parameters allows free-delamination drilling [23][24][25][26][27]. Several empirical studies have been performed to understand the effects of drilling parameters on drilling thrust force and associated delamination.…”

Acoustic Emission-Based Methodology to Evaluate Delamination Crack Growth Under Quasi-static and Fatigue Loading Conditions

“…However, these materials suffer from different damage mechanisms, such as matrix cracking, fiber breakage and delamination [5][6][7][8]. The principal mode of failure in laminated composites is the separation along the interfaces of the layers, viz, delamination [9][10][11][12][13][14]. This failure results in dramatic reduction of residual strength and stiffness of the structure.…”