Sheet Material Concave-Convex Stiffness Weight Reduction
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Solution Overview
Problem
Conventional sheet materials with concave-convex parts fail to achieve optimal stiffness and weight reduction, with stiffness anisotropy and weight reduction effects being insufficient for lightweight applications such as vehicle panels and laminated structures.
Innovation Solution
A sheet material design featuring a concave-convex pattern with specific reference planes and area configurations, including first and second reference areas that protrude from intermediate planes, enhancing bending stiffness and energy absorption characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional embossed concave-convex parts are formed in sheet material, then stiffness is increased, but stiffness anisotropy remains and weight reduction effect is insufficient (only approximately 20%)
Solution Approach 1:
The invention applies curvature by forming a three-dimensional concave-convex shape with protruding parts that extend in the thickness direction of the sheet material. The protruding parts have curved surfaces including inclined surfaces and top surfaces, creating a complex three-dimensional geometry rather than simple planar embossing. This curvature in multiple directions simultaneously increases stiffness while reducing weight by approximately 40% or more.
Solution Approach 2:
The invention transitions from two-dimensional planar embossed patterns to three-dimensional protruding structures that extend into the thickness direction of the sheet material. The protruding parts create depth and volume, adding a third dimension to the structural reinforcement. This dimensional change enables significantly higher stiffness increase effects while achieving weight reduction of approximately 40% or more by optimizing material distribution in three-dimensional space.
2Strength
If conventional embossed concave-convex parts are formed in sheet material, then stiffness is increased in one direction, but desired stiffness increase effect is not obtained in other directions (stiffness anisotropy)
Solution Approach 1:
The invention employs asymmetric protruding parts with specific geometric configurations including inclined surfaces at defined angles and non-uniform cross-sections. The protruding parts have asymmetric shapes that are strategically oriented to provide stiffness enhancement in multiple directions simultaneously. This asymmetric design allows the structure to resist bending and deformation more effectively regardless of the direction of applied load, reducing stiffness anisotropy while maintaining weight reduction benefits.
Data Source
AI summary
A sheet material (1) includes a stiffness-increasing concave-convex part (20). A first reference plane (K1), an intermediate reference plane (K3), and a second reference plane (K2) serve as a reference system. First reference areas (213), which have a specific shape, and second reference areas (223), which are all areas other than the first reference areas (213), are disposed in the intermediate reference plane (K3). The concave-convex part (20) is formed of first areas (21) as well as second areas (22) and/or plane areas (23).