Optimal Transportation Meshfree: A Powerful Method for Simulating Hypervelocity Impact

The study of high-speed impact has become increasingly important in various fields, such as materials science, mechanical engineering, and aerospace engineering. The Optimal Transportation Meshfree (OTM) method is a promising approach for simulating these complex phenomena. In this article, we will explore the capabilities of OTM and its application to the simulation of hypervelocity impact.

Thermomechanical Coupling in High-Speed Impact

When a high-speed projectile collides with a target plate, extreme conditions are created, including high strain rates, high pressures, and high temperatures. To accurately capture these dynamics, it is essential to incorporate thermomechanical coupling into the simulation model. The variational thermomechanical coupling constitutive model, used in conjunction with the SESAME equation of state, rate-dependent J2 plasticity, power law hardening, thermal softening, and temperature-dependent Newtonian viscosity, provides a robust framework for modeling these complex interactions.

Large-Scale Simulations Using OTM

To demonstrate the capabilities of OTM, large-scale three-dimensional numerical simulations were performed using Li et al.'s method. The simulation involved the impact of Nylon 6/6 cylindrical projectiles on Al6061-T6 plates at hypervelocity rates. The results showed that OTM is a powerful tool for capturing the dynamic response of the target plate during high-speed impact.

Advantages of Optimal Transportation Meshfree

The OTM method offers several advantages over traditional numerical methods. First, it is capable of handling large deformations and complex material behavior, making it well-suited for simulations involving high-strain-rate phenomena. Second, OTM can accurately capture the dynamic response of materials undergoing phase transitions, such as melting or vaporization, which is critical in high-speed impact simulations.

In conclusion, the Optimal Transportation Meshfree method has been successfully applied to simulate hypervelocity impact using a variational thermomechanical coupling constitutive model. The results demonstrate the power and flexibility of OTM for capturing complex dynamics during high-speed impact. Future research directions may involve exploring the applicability of OTM to other areas, such as blast wave propagation or explosive loading.

Optimal transportation meshfree