石墨烯复合微粒喷射成型行为模拟与实验

Simulation and Experimental Study on Spray Molding Behavior of Graphene Composite Particles

利用ANSYS/LS-DYNA模拟分析了不同冲击速度下石墨烯复合微粒嵌入半固态酚醛树脂基体行为,分析研究了嵌入瞬间石墨烯复合微粒与基体塑性变形现象以及结合深度变化规律。研究表明,复合微粒与基体的塑性变形随冲击速度增大而增大,当冲击速度超过600m/s时,复合微粒完全嵌合在基体中,此时,基体有效塑性应变发生突变,体系发生绝热剪切失稳现象。同时,更多的动能向内能转化,使基体由弹性状态转变为粘弹性状态,从而有助于复合微粒与基体结合。当冲击速度小于600m/s时,复合微粒未完全嵌合在基体中。最后通过实验验证上述结论的正确性。

ANSYS/LS-DYNA finite element analysis was used to simulate the behavior of graphene composite particles embedded in semi-solid phenolic resin matrix under different pre-plate impact velocities.The phenomenon of plastic deformation and the change of bonding depth of embedded graphene composite particles and semi-solid phenolic resin matrix were studied.The research shows that the plastic deformation of the composite particles and the semi-solid phenolic resin matrix increases with the increase of the impact velocity.When the impact velocity exceeds 600 m/s,the composite particles are completely embedded in the semi-solid phenolic resin matrix.At this time,the effective plastic strain of the semi-solid phenolic resin matrix is abrupt,and the system undergoes adiabatic shear instability.At the same time,more kinetic energy is transformed into the inner energy,which causes the semi-solid phenolic resin matrix to change from the elastic state to the viscoelastic state,thereby contributing to the combination of the composite particles and the semi-solid phenolic resin matrix.When impact velocity is less than 600 m/s,the composite particles are not completely fitted into the matrix.Finally,the correctness of the above conclusions have been verified by experiments.