Raised Recessed Sheet Material Stiffness Weight Trade-off
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing sheet materials with raised and recessed patterns struggle to achieve optimal stiffness without increasing thickness, leading to anisotropic stiffness and insufficient weight reduction, while conventional methods fail to enhance both bending and surface stiffness simultaneously.
Innovation Solution
A sheet material with a surface formed by a combination of four basic configurations (A, B, C, D) featuring Z-shaped patterns arranged in perpendicular directions, where the first and second regions are raised and recessed respectively, to create a high-stiffness, low-weight material with improved energy absorption properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the sheet material thickness is increased to improve stiffness, then the bending stiffness is improved, but the weight increases
Solution Approach 1:
The patent transforms the flat two-dimensional sheet into a three-dimensional structure by forming raised and recessed portions. This dimensional change creates geometric stiffness without adding material thickness, achieving weight reduction of 20-50% while improving bending stiffness through the spatial configuration of the pattern
2Weight of moving object
If conventional raised and recessed patterns are formed to reduce weight, then weight reduction is achieved, but the surface stiffness improvement is insufficient compared to bending stiffness improvement
Solution Approach 1:
The patent creates different local structures within each square unit by dividing it into first and second regions using partition lines. The Z-shaped patterns formed by these partition lines create localized geometric features that specifically enhance surface stiffness while maintaining overall weight reduction. The different basic configurations (A, B, C, D) provide varied local qualities across the sheet surface
Data Source
AI summary
A raised and recessed sheet material having extremely high stiffness, and useful vehicle panel and laminated structure using the same. The surface of the sheet is formed by a plurality of squares arranged in two mutually perpendicular directions, and has a raised and recessed pattern. A basic configuration A, where first regions M and a Z-shaped second region N are formed in the square, and basic configurations B to D derived from the basic configuration A are butted together at their peripheral edges such that first regions M having those peripheral edges are butted together and the second regions N having those peripheral edges are butted together. The raised and recessed pattern is formed by upwardly raising the first regions M and downwardly recessing the second regions N, or upwardly raising or downwardly recessing either one or both of the first and second regions M and N.