Prediction of Load-Bearing Capacity of Composite Parts with Low-Velocity Impact Damage: Identification of Intra- and Inter-Ply Constitutive Models

Abstract

Assessments of residual load-carrying capacity are often conducted for composite structural components that have received impact damage. The availability of a verified simulation methodology can provide significant cost savings when such assessments are required. To support the development of a reliable and accurate simulation methodology, this study investigated the predictive capabilities of a stacked solid-shell finite element model of a cylindrical composite component with a damage mechanics-based description of the intra-ply material response and a cohesive contact model used for simulation of the inter-ply behavior. Identification of material properties for the model was conducted through mechanical characterization. Special attention was paid to understanding the influence of non-physical parameters of the intra- and inter-ply material models on predicting compressive failure load of damaged composite cylinders. Calibration of the model conducted using the response surface methodology allowed for identifying rational values of the non-physical parameters. The results of simulations with the identified and calibrated finite element model showed reasonable correlation with experimental data in terms of the predicted failure loads and post-impact and post-failure damage modes. The investigated modeling technique can be recommended for evaluating the residual load-bearing capacity of flat and curved composite parts with impact damage working under the action of compressive loads.

Model Test and Numerical Simulation of Water Conservancy Foundation Bearing Capacity

“…The three exploration holes reveal that the thickness of the sludge layer is about 10 m and the filling layer is about 4–6 m. Three test areas are arranged in this test, and three test piers are arranged in each test area. The three test piers in test area 1 are 1-1, 1-2, and 1-3; the three test piers in test area 2 are 2-1, 2-2 and 2-3; The three test piers in test area 3 are 3-1, 3-2 and 3-3 [ 13 ]. See Table 2 for test pier parameters.…”

“…e three test piers in test area 1 are 1-1, 1-2, and 1-3; the three test piers in test area 2 are 2-1, 2-2 and 2-3; e three test piers in test area 3 are 3-1, 3-2 and 3-3 [13]. See Table 2 for test pier parameters.…”

Simulation Analysis of Delamination Damage for the Thick-Walled Composite-Overwrapped Pressure Vessels

“…Aleksandr Cherniaev et al, used the tiebreak contact algorithm to model interlaminar damage behavior and analyzed the effect of nonphysical parameters of the interlaminar material model on the prediction of compressive damage loads in damaged composite cylinders. The peak stress parameter NLFS of the interlaminar model was able to accurately predict the damage loads observed in physical experiments when the parameter SLIMC, associated with the continuous damage criterion, was between 0.6 and 1 [ 10 ]. Jinyang Zheng et al, used the tiebreak contact algorithm to simulate interlaminar failure behavior.…”

Prediction of Damage in Non-Crimp Fabric Composites Subjected to Transverse Crushing: A Comparison of Two Constitutive Models

“…However, similarly to conventional unidirectional tape-and woven fabric-based materials (see, e.g., [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]), in-service damage, such as tool dropping or unintended collision, can be a cause for severe reduction in load-carrying capacity of NCF composites [20][21][22][23][24][25]. For example, Bibo et al [24] demonstrated that resistance to propagation of damage and the compression after impact strength of NCF panels were not superior to their unidirectional prepreg tape equivalents.…”

“…In particular, two LS-DYNA material models were evaluated: *MAT_ENHANCED_COMPOSI TE_DAMAGE (MAT 54) and *MAT_LAMINATED_COMPOSITE_FABRIC (MAT 58). Both constitutive models have been widely used for modeling of variety of in-service damage scenarios in UD tape and woven fabric composites, including damage induced by axial crushing (MAT 54: [5,12,[33][34][35][36]; MAT 58: [12,[37][38][39][40][41][42]) and transverse loading (MAT 54: [36,43,44]; MAT 58: [6,[45][46][47]). The main takeaway from these studies is that both constitutive models can quite accurately predict the behavior of tape and woven fabric materials but require determination of their non-physical parameters (so-called stress limit factors, element erosion strain, etc.)…”