Side Member Distal End Structure for Crash Energy Absorption
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Solution Overview
Problem
In existing crash box structures, the lid member's contact with the flange part during collisions leads to stress concentration and reduced energy absorption due to the end part of the side plate coming into contact, causing a decrease in energy absorption efficiency.
Innovation Solution
A side member distal end structure is designed with a closed section part and a flange part, where the lid member's side plate is partially joined to the outer surface of the closed section part, directing its plate surface to face the flange part, and featuring a recessed part and an upright part to ensure accurate contact and reduce stress concentration, along with a fastening part to secure the bumper reinforcement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lid member is provided on the front side of the crash box, then the structural completeness and protection are improved, but stress concentration occurs in the flange part during collision, reducing energy absorption
Solution Approach 1:
The side member distal end part is divided into a closed section part and a flange part, with the lid member joined to the closed section part. This segmentation isolates the lid member from direct contact with the flange part during collision, preventing stress concentration while maintaining structural completeness.
Solution Approach 2:
The closed section part acts as an intermediary between the lid member and the flange part. By joining the lid member to the closed section part rather than directly to the flange part, the structure mediates collision forces, preventing direct stress transmission to the flange part and maintaining energy absorption capability.
2Device complexity
If the end part of the side plate contacts the flange part during collision, then the structural connection is simplified, but stress concentration occurs, reducing energy absorption efficiency
Solution Approach 1:
The side plate is segmented into an end part and a side surface part, with the side surface part joined to the closed section part. This segmentation ensures that during collision, the side surface (with larger contact area) rather than the end part contacts the flange part, reducing stress concentration while maintaining connection simplicity.
Solution Approach 2:
Different parts of the side plate have different functions: the end part provides structural closure, while the side surface part provides the collision interface. This local quality differentiation ensures optimal contact characteristics during collision, with the side surface part engaging the flange part to distribute stresses.
Data Source
AI summary
A side member distal end structure includes: a side member distal end part and a lid member disposed forward of a distal end of the side member distal end part. The side member distal end part includes: a closed section part whose sectional shape orthogonal to the vehicle front-rear direction has a closed section structure; and a flange part in which a first panel and a second panel are joined to each other, the flange part being disposed outer than the closed section part and extending along the vehicle front-rear direction. The lid member includes a side plate part partially joined to an outer surface which is a part of the closed section part and is disposed forward of the flange part. In the vehicle front-rear direction, a plate surface of the side plate part faces the flange part.