Composite Frame Corner Layup to Prevent Buckling Under Bending
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Fiber reinforced composite frames used in vehicles face challenges with buckling due to layer separation at corners, leading to a decrease in bending strength, as existing configurations fail to effectively prevent this issue.
Innovation Solution
A frame design with an enclosed cross-section featuring a compressive wall part and side wall part, where the compressive wall part has longitudinal alignment layers and the side wall part has differential alignment layers with fibers oriented differently, enhancing the frame's ability to withstand compressive and shear stresses and preventing buckling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the number of fiber alignment layers is increased at the corner to improve stiffness, then the corner stiffness is improved, but layer separation occurs leading to buckling
Solution Approach 1:
The patent applies different fiber alignment layer configurations to different regions of the frame. Specifically, the compressive wall part has fiber alignment layers with fibers oriented in the longitudinal direction, while the side wall part has fiber alignment layers with fibers oriented in the normal direction. This local differentiation allows each region to optimally resist the stresses it experiences, preventing layer separation and buckling while maintaining corner stiffness.
Solution Approach 2:
The patent uses a composite structure of fiber alignment layers with different orientations. By combining layers with longitudinal fiber alignment in the compressive wall part and normal directional fiber alignment in the side wall part, the frame achieves both high stiffness and resistance to layer separation, effectively resolving the contradiction between strength and reliability.
2Strength
If the frame cross-section is enclosed with increased thickness at corners, then corner stiffness is improved, but layer separation occurs at the corner
Solution Approach 1:
The patent addresses layer separation by implementing different fiber alignment configurations in different regions. The compressive wall part has fibers aligned in the longitudinal direction to maintain layer stability under compressive loads, while the side wall part has fibers aligned in the normal direction to prevent delamination at the corner. This regional differentiation prevents layer separation while maintaining the increased corner thickness for stiffness.
Data Source
AI summary
Provided is a frame which is made of a fiber reinforced composite and has an increased bending strength by suppressing occurrence of buckling. The frame which is made of a fiber reinforced composite includes: a compressive wall part where a compressive stress occurs in a longitudinal direction of the frame when the frame receives a bending load in a normal direction perpendicularly intersecting the longitudinal direction; and a side wall part extending in the normal direction and defining one of corners with the compressive wall part. The compressive wall part includes a longitudinal alignment layer having reinforcement fibers aligned in the longitudinal direction. The side wall part has a surface section composed of a normal directional alignment layer having reinforcement fibers aligned in a direction different from the longitudinal direction, and serving as a differential alignment layer.