Rate-Dependent Cohesive Models for Dynamic Mode I Interfacial Propagation and Failure of Unidirectional Composite Laminates

Abstract

With the increasing application of composite materials in anti-impact structure, the development of reliable rate-dependent interlaminar constitutive model becomes necessary. This study aims to assess and evaluate the applicability of three types of rate-dependent cohesive models (logarithmic, exponential and power) in numerical delamination simulation, through comparison with dynamic test results of double cantilever beam (DCB) specimens made from T700/MTM28-1 composite laminate. Crack propagation length history profiles are extracted to calibrate the numerical models. Crack propagation contours and fracture toughness data are predicted, extracted and compared to investigate the difference of the three different rate-dependent cohesive models. The variation of cohesive zone length and force profiles with the implemented models is also investigated. The results suggest that the crack propagation length can be better predicted by logarithmic and power models. Although crack propagation length profiles are well predicted, the numerical calculated dynamic fracture toughness tends to be higher than that of experimental measured results. The three models also show differences in the prediction of maximum loading forces. The results of this work provide useful guidance for the development of more efficient cohesive models and more reliable interface failure simulation of impact problems.

Low‐velocity impact damage and compression after impact behavior of CF/PEEK thermoplastic composite laminates

“…Furthermore, the capabilities of logarithmic, exponential, and power‐type rate‐dependent cohesive models in predicting crack propagation length, energy release rate, cohesive zone length, and reaction force are discussed and compared. [ 39 ] Waas et al [ 40 ] proposed a structural framework based on a smart mesh paradigm, an efficient modeling strategy, and a damage state transferring algorithm between LVI and CAI mesh to reduce computational time. Riccio et al [ 41 ] proposed a novel delamination growth simulation method to evaluate the effect of fiber bridging, which simulated the effect of fiber bridging on the debonding of skin‐stringer by changing the toughness of materials.…”