The morphology of the joint surface is multi-scale. and it can be divided into first-order asperity (waviness) and second-order asperity (unevenness). At present. the joint roughness characterization formula considers only the morphology contribution of waviness and unevenness components and does not fully consider their mechanical contribution. https://hollandscountryclothinges.shop/product-category/rifle-bolt-pouch/