What surface roughness parameters ensure safe composite material contact?

Surface roughness plays a critical role in ensuring safe and reliable contact between composite materials. Key parameters like Ra (Average Roughness) and Rz (Mean Roughness Depth) are essential for evaluating surface quality. Ra measures the average deviations in the surface, while Rz assesses the peak-to-valley height, both influencing friction, wear, and adhesion.

For composite materials, an optimal Ra range of 0.4–1.6 µm is often recommended to balance smoothness and grip, reducing wear risks. Rz values should typically stay below 10 µm to prevent excessive stress concentrations. Proper roughness control enhances bonding strength, minimizes delamination, and improves longevity in applications like aerospace or automotive components.

Understanding these parameters ensures safer, more durable composite material interactions, aligning with industry standards for performance and reliability.