What is the reason for the cracks in the aluminum honeycomb core?

What is the reason for the cracks in the aluminum honeycomb core?

During the production process, aluminum honeycomb cores need to be extruded by external forces to achieve product deformation and meet design requirements. However, the aluminum honeycomb core material is in a three way output state, and this production method can better weld small cracks inside the aluminum honeycomb core material and reduce the impact of impurities. This has certain advantages in improving the plasticity of aluminum honeycomb core materials. However, various cracks may appear on the surface of aluminum honeycomb core materials.

Aluminum honeycomb core material deforms in the direction of the hole through friction during material processing. The flow velocity between the surfaces of aluminum honeycomb core material is slower, but the flow velocity in the axial part will be faster, which makes the uneven processing inside the metal cylinder more obvious. There are differences in the velocity of metal flow inside and outside, but the two are a whole, so the internal forces must be balanced with each other, which increases the additional tensile stress value.

If the mold shape is complex, such as aluminum honeycomb core processing blades, due to uneven thickness, different resistance, thin friction resistance, fast heat dissipation, slow flow, and tensile stress at the joints are often prone to cracking, especially when processing plastic materials with aluminum honeycomb core.