Deep-Drawn Panel Recess Rib Structure for Stiffness
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Solution Overview
Problem
Deep-drawn wells in vehicle bodies, such as trunk and spare-tire wells, face challenges in achieving sufficient stiffness and strength to withstand loads and natural vibrations without resorting to costly and weight-increasing reinforcement methods, and existing rib structures often lead to material irregularities and accordion-like deformations at transition areas.
Innovation Solution
The implementation of a rib structure where first and second bottom ribs and wall ribs are arranged in shared vertical planes, with their profiles transitioning in a manner that creates a 'zero passage' area, forming an undeformed tension-stiff and compression-stiff zone, and optionally forming a stiff tension-compression band around the well's circumference, enhancing stiffness and resonance behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If profiled supports or star-shaped supports are used to reinforce the well, then the stiffness and strength of the well are improved, but the weight and cost increase
Solution Approach 1:
The reinforcement structure is segmented into multiple bottom ribs and wall ribs that are distributed throughout the well. Each rib provides localized reinforcement, and their combined effect achieves the required overall stiffness and strength without needing a single heavy support structure
Solution Approach 2:
The reinforcement transitions from using thick vertical supports to using horizontal ribs that extend in the circumferential direction. By adding ribs that run around the circumference of the well, stiffness is increased in a different dimensional approach, avoiding the need for heavy vertical profiled supports
2Strength
If ribs are created in the bottom surface to reinforce the well, then the structural reinforcement is improved, but material irregularities and ruptures occur in the transition area
Solution Approach 1:
The ribs are given a curved, rounded profile instead of sharp angular transitions. The bottom ribs and wall ribs connect with smooth curves that gradually transition the material flow, eliminating sudden directional changes that cause stress concentrations and material rupture during deep-drawing
Solution Approach 2:
The rib profile parameters are specifically designed with rounded transitions and optimized curvature radii. By changing the geometric parameters of the rib profile from angular to curved, the material flow during forming is improved, preventing irregularities and ruptures in the transition area
3Strength
If multiple adjacent ribs are provided to reinforce the well, then the reinforcement potential is increased, but the edge area develops an accordion-like configuration that reduces stiffness
Solution Approach 1:
The ribs are designed with different local qualities - the bottom ribs have a first profile configuration while the wall ribs have a second profile configuration. This local differentiation allows each rib to perform its specific function optimally while working together to prevent accordion-like deformation in the edge area
Solution Approach 2:
The reinforcement system uses a composite rib structure where bottom ribs and wall ribs with different profiles are combined. This composite approach creates a more sophisticated reinforcement system that addresses both the need for strength and the prevention of edge area deformation
Data Source
AI summary
A recess (1′) is proposed in a bottom panel (2′) of a body, in particular of a vehicle body, having a recess bottom (4′) which for its part merges into a recess wall (5′), wherein the recess (1′) has one or more first bottom corrugations (3′) which reinforce the recess bottom (4′) and one or more first wall corrugations (6′) which reinforce the recess wall (5′), wherein at least one first bottom corrugation (3′) and at least one associated first wall corrugation (6′) are arranged in a common vertical plane in such a way and are formed in such a way that the profile structure of the first bottom corrugation (3′) adjoins the profile structure of the associated first wall corrugation (6′) in the transition region from the recess bottom (4′) to the recess wall (5′), and wherein the shaped-out portion of said first wall corrugation (6′) is changed with regard to the shaped-out portion of the first bottom corrugation (3′) in such a way that the first bottom corrugation (3′) is formed towards the recess interior and the associated first wall corrugation (6′) is formed towards the recess exterior or vice versa.