Delamination Buckling and Crack Propagation Simulations in Fiber-Metal Laminates Using xFEM and Cohesive Elements
Abstract
:Featured Application
Abstract
1. Introduction
2. Numerical Models
2.1. Material Model for Cohesive and xFEM Elements
2.2. xFEM’s Formulation
2.3. Double Cantilever Beam Model
2.4. Delamination-Buckling Analysis
3. Results and Discussion
3.1. Double Cantilever Beam Simulation Results
3.2. Delamination-Buckling Simulation Results
3.2.1. Influence of the Fracture Simulation Algorithms
3.2.2. Influence of the Through-Thickness Position of Delamination
3.2.3. Influence of the Strength Ratio and the Reference Strength
3.3. Computation Time
4. Summary and Conclusions
- LS-DYNA’s shell elements could be used to simulate plane strain conditions in circumstances when plane strain elements cannot be used to conduct the analysis.
- The analysis of the DCB specimens using the combined xFEM and cohesive approach proved that the crack kinking that was experimentally observed to occur within the adhesive could be simulated precisely. The model that used only the xFEM elements could not capture the phenomenon.
- The above-mentioned combined approaches could also successfully simulate the delamination buckling response of the FML model with good accuracy. The delamination was demonstrated to change its propagation path that was initially within the adhesive (i.e., through the xFEM elements) towards the adhesive/metal interface, and subsequently propagating along the interface (i.e., through the cohesive elements). The delamination path deviation response highlights the importance of the role of surface preparation (i.e., interfacial integrity) in enhancing the performances of such FMLs under compressive loading states.
- Using the same material model and properties, the model constructed using only xFEM elements appeared to overestimate the energy required for the crack/delamination to propagate in comparison with the model constructed with the cohesive elements.
- The use of xFEM elements resulted in more accurate predictions of crack initiation and propagation. However, from a solution time perspective, especially when large complex geometries are to be modeled, the use of cohesive elements is deemed preferable, so long as the crack or delamination path is known a priori.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
Appendix A
*SECTION_SHELL | ELFORM = 2, NIP = 1 |
*SECTION_SHELL_XFEM | ELFORM = 54, NIP = 4, CMID = id of the cohesive material, BASELM = 16, DOMINT = 0, FAILCR = 1 |
*MAT_COHESIVE_TH | INTFALL = 1, STFSF = 100 |
*DATABASE_EXTENT_BINARY | NEIPS = 1 |
Elastic (*MAT_ELASTIC) | |||
FRP | ρ = 1630 kg/m3 | E = 25 GPa | ν = 0.254 |
Magnesium | ρ = 1740 kg/m3 | E = 36 GPa | ν = 0.35 |
Adhesive | ρ = 1200 kg/m3 | E = 3 GPa | ν = 0.3 |
Cohesive (*MAT_COHESIVE_TH) | |||
ρ = 1200 kg/m3 | σmax = 0.008 GPa ♣ | δnorm = 0.015 mm | δtan = 0.02 mm |
λ1 = 0.5 | λ2 = 0.5 | λfail = 1 |
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De Cicco, D.; Taheri, F. Delamination Buckling and Crack Propagation Simulations in Fiber-Metal Laminates Using xFEM and Cohesive Elements. Appl. Sci. 2018, 8, 2440. https://doi.org/10.3390/app8122440
De Cicco D, Taheri F. Delamination Buckling and Crack Propagation Simulations in Fiber-Metal Laminates Using xFEM and Cohesive Elements. Applied Sciences. 2018; 8(12):2440. https://doi.org/10.3390/app8122440
Chicago/Turabian StyleDe Cicco, Davide, and Farid Taheri. 2018. "Delamination Buckling and Crack Propagation Simulations in Fiber-Metal Laminates Using xFEM and Cohesive Elements" Applied Sciences 8, no. 12: 2440. https://doi.org/10.3390/app8122440
APA StyleDe Cicco, D., & Taheri, F. (2018). Delamination Buckling and Crack Propagation Simulations in Fiber-Metal Laminates Using xFEM and Cohesive Elements. Applied Sciences, 8(12), 2440. https://doi.org/10.3390/app8122440