Local damage in a 5-harness satin weave composite under static tension: Part II – Meso-FE modelling

Abstract

This study forms the second part of a paper on the local damage analysis in a thermoplastic 5-harness satin weave composite under uni-axial static tensile load. The experimental observations of Part I are confronted with the meso-FE simulations. Part II describes the following steps regarding the unit cell meso-FE modeling starting from: 1) Construction of the unit cell geometrical model; 2) Estimation of the homogenized elastic constants of the unit cell using different boundary conditions; 3) Evaluation of the local stress and damage behavior of the unit cell using meso-FE simulations. The aim of the numerical analysis is to investigate the dependency of local ply stress and damage profiles on the adjacent layers of the laminate.

On the tension–tension fatigue behaviour of a carbon reinforced thermoplastic part I: Limitations of the ASTM D3039/D3479 standard

“…The in-plane elastic properties of the individual carbon PPS lamina were determined by the dynamic modulus identification method as described in [25] and are listed in Table 1. These values were also confirmed by meso-scale modelling [26,27]. Table 1 In-plane elastic properties of the individual carbon/PPS lamina (dynamic modulus identification method).…”

Study of the Mode I and Mode II interlaminar behaviour of a carbon fabric reinforced thermoplastic

“…From the force-displacement curve, the compliance C (=δ/F) is calculated and C 0 is determined from the linear part of this curve. Next, the flexural stiffness E f is calculated: The fact that G 13 is necessary for this method is sometimes a problem, but for the material under study, the G 13 value is accurately determined by meso-scale modelling [14] and is equal to 3048 MPa. Equation 4 already takes the stress concentration around the tip and bending of the specimen into account, but it does not yet consider material degradation just behind the tip.…”

Local strain in a 5-harness satin weave composite under static tension: Part II – Meso-FE analysis

“…• From the local stress analysis on different unit cell models, it is evident that the weft yarn transverse stress is sensitive to the ply position in the laminate along with the out-of-plane shear stress [14]. The variation in the local transverse stress at the yarn crimp location causes the sequential weft yarn damage according to the ply position in the laminate.…”

“…Also, from the investigation of the effect of mesh density on the unit cell local stress behavior [14] it appears that when the yarn contains four or more elements over its crosssection, the local stress behaviour converges to the same value.…”

“…In order to start the meso-FE simulations, construction of the unit cell geometrical model and translation into FE mesh is accomplished as explained in [14] and briefly described as follows : 1) variation of the internal yarn dimensions in the 5-satin weave composite is quantified using the micro-CT analysis; 2) along with the carbon fibre data, the obtained textile parameters from the micro-CT measurements (Table 1) are used as an input to the unit cell geometrical modeler software 'WiseTex' [6,15]; 3) finally, the 'WiseTex' generated unit cell geometrical model is translated into FE mesh and filled with the matrix mesh in the 'MeshTex' software [6].…”