Wire-Stiffened Curved Panel Structure for Surface Quality
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Solution Overview
Problem
Conventional stiffened panel structures for automobile doors suffer from low surface quality due to differences in thermal expansion coefficients between the panel body and reinforcing members, leading to plastic deformation and degradation of surface quality, which compromises the expected enhancement of flare rigidity.
Innovation Solution
A stiffened panel structure that includes a panel body with a wire bonded at specific end points, where the wire is strained between these points, either directly on the panel body or via an auxiliary component or supporting member, minimizing the junction area and reducing the impact of thermal expansion differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a reinforcing member made of resin is entirely bonded to the panel body, then flare rigidity is enhanced, but surface quality degrades due to differential thermal expansion causing plastic deformation
Solution Approach 1:
The reinforcing member is segmented into a main body portion and end portions, where only the end portions are bonded to the panel body while the main body portion remains unbonded. This segmentation allows the bonded end portions to provide anchoring for flare rigidity enhancement while the unbonded main body portion avoids causing surface deformation through differential thermal expansion.
Solution Approach 2:
Different portions of the reinforcing member have different bonding states: the end portions are bonded to the panel body to provide local reinforcement and anchoring, while the main body portion is left unbonded to avoid thermal expansion issues. This local quality differentiation resolves the contradiction between needing bonding for strength and avoiding bonding for surface quality.
2Manufacturing precision
If a reinforcing member made of steel is entirely bonded to the panel body, then surface quality is maintained, but dimensional accuracy must be strictly managed to prevent plastic deformation
Solution Approach 1:
The reinforcing member is divided into bonded end portions and an unbonded main body portion. This segmentation reduces the total bonded area, thereby reducing the cumulative effect of dimensional inaccuracies on the panel body while still providing sufficient anchoring at the ends to enhance flare rigidity.
Solution Approach 2:
Instead of bonding the entire reinforcing member (excessive action), only the end portions are bonded (partial action). This partial bonding provides sufficient reinforcement for flare rigidity while minimizing the impact of dimensional accuracy variations on the panel body's surface quality.
3Manufacturing precision
If the junction area between reinforcing member and panel body is reduced, then thermal expansion impact is minimized, but flare rigidity enhancement may be compromised
Solution Approach 1:
The reinforcing member is segmented such that only the end portions are bonded to the panel body, creating a minimal junction area that reduces thermal expansion impact. The unbonded main body portion extends into the panel body's outward curved region, providing reinforcement through its geometric configuration rather than through bonding.
Solution Approach 2:
The reinforcement mechanism is shifted from relying on bonding area (two-dimensional contact) to relying on the three-dimensional geometric configuration of the unbonded main body portion within the panel body's outward curved region, thereby maintaining flare rigidity enhancement with minimal junction area.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The structure maintains surface quality while enhancing flare rigidity by suppressing deformation at the points of attachment, allowing for improved load resistance without the need for strict dimensional control of the reinforcing member.
Implementation Method 1
The wire has a first end portion and a second end portion. The first end portion is bonded to a first point on an inner surface of the panel body. The second end portion is bonded to a second point on the inner surface of the panel body. The wire is strained between the first point and the second point.
Data Source
AI summary
A stiffened panel structure includes a panel-shaped component and a wire. The panel-shaped component has a panel body that curves in such a manner as to be convex outward. The wire has a first end portion and a second end portion. The first end portion is bonded to a first point on the inner surface of the panel body. The second end portion is bonded to a second point on the inner surface of the panel body. The wire is strained between the first point and the second point.