NICOP - Identification of Damage Accumulation for CFRP Subjected to Fatigue, Creep and Impact Loadings
Abstract
In this study, we identify the damage accumulation in carbon fiber reinforced polymer (CFRP) due to creep, and cyclic and impact loadings and their combinations at various temperature conditions. This enables us to accurately predict creep rupture as well as fatigue, impact, and residual strengths after the loading. A microscopic periodic unit cell (PUC) simulation, in which several tens of fiber and the surrounding material matrix are modeled, is performed, and the validation of the analytical results is conducted by comparing these results with the experimental results. The present study deals with the transverse failure of unidirectional CFRP by initiating a crack at the usual CFRP laminate, subjecting it to various tensile loadings, and predicting both in situ strengths during loading and residual strengths after loadings. The key point of this simulation is introducing a temperature-dependent viscoelastic- plastic constitutive equation considering ~damage~ based on thermodynamics for a matrix material, in addition to interface damage which is simulated by cohesive zone modeling. This accurate durability prediction is expected to be worthwhile in the near future when CFRP is significantly applied to motor vehicle applications. The proposed study is scheduled to span three years, during which we intend to publish one peer-reviewed journal article and present the results of our study at one internationalconference during each year of this period.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Feb 03, 2017
- Source ID
- N629091712039
Entities
People
- Jun Koyanagi
Organizations
- Office of Naval Research
- Tokyo University of Science
- United States Navy