Impact simulation on the composite sheet
Low-velocity and high-velocity impact simulation on composite structures is a phenomenon that engineers in various industries such as aerospace, marine, and automotive should focus more on. In this project, the impact on the laminate was studied with the help of Abaqus and LS-Dyna software.
In order to simulate the damage in the composite, the model of the composite material was used along with the degradation criterion and its growth law. This model has the ability to grow damage gradually. Many problems related to numerical simulations such as instability and dependence of the results on the size of the element tried in this model are reduced as much as possible.
Composite impact resistance
Comparing several different sheets, it was concluded that the composite sheets show good impact resistance. In low-speed impact simulation in order to better analyze different modes of damage can be seen. These modes include matrix cracking, fiber breakage, and cracking. To simulate delamination, the Cohesive Zone Model was used because of its advantages over other methods, such as the VCCT method in Abaqus software.
Achievements of the low-velocity impact simulation project
- Production of V / UMAT and V / USDFLD subroutines to predict composite sheet failure by Hashin, Puck, and maximum stress failure criteria in Abacus software
- Leak simulation and prediction by various Tie_break, Cohesive contact, and German methods
- Determining the best material models for predicting the behavior of composites in LS-Dyna software
- Familiarity with advanced methods of composite material modeling
- Familiarity with different methods of modeling laminates, Randomly chopped fiber, Filament winding, Woven in Abacus and LS-Dyna software
- Familiarity with plastic injection methods for needle composites
- Familiarity with different methods of predicting damage and breakdown and differences and advantages of each in Abaqus and LS-Dyna software
- Analysis of a composite structure in real scale and validation between peers and virtual tests
- Familiarity with and application of the latest model for predicting failure in composite materials called LaRC05, produced by NASA’s Langley Lab and used in Abacus and LS Dyna software
- Advanced and optimal coding of composite materials with high accuracy and computational speed
- Simulation and prediction of a low-cycle and high-cycle fatigue of some special composites with the help of subroutine writing and the use of specialized plug-ins