Composite Laminate Bending Forming Wrinkle Suppression
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Solution Overview
Problem
During bending forming of laminates, regions may experience fiber excess or shortage states, leading to compressive or tensile forces that can generate wrinkles, reducing the strength of the composite structure.
Innovation Solution
A method involving a lamination step to create a laminate with a deformable portion having a specific shape, where the cross section in one direction and an intersecting direction are bent or curved, and the length in the intersecting direction changes along the one direction, followed by a forming step where bending forming is performed along a deformation line in the deformable portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the amount of material is increased at a location where the laminate is expected to be in shortage of fibers when bent, then the fiber shortage state is improved, but wrinkles are generated in the portion where the amount of material is increased
Solution Approach 1:
The laminate is pre-formed with a deformable portion having a specific shape where the length in the intersecting direction changes along the one direction before bending forming. This preliminary shaping anticipates the fiber distribution needs during bending, preventing both fiber shortage and wrinkle formation without requiring additional material
Solution Approach 2:
The deformable portion has locally varied geometry where the length in the intersecting direction changes along the one direction. This local geometric variation optimizes fiber distribution specifically in regions prone to fiber shortage during bending, eliminating the need to increase material amount globally or locally
2Shape
If bending forming is performed on a laminate, then the composite structure with arbitrary cross-sectional shape is produced, but fiber excess or shortage states occur leading to wrinkles
Solution Approach 1:
The laminate is pre-formed with a deformable portion having a specific shape where the length in the intersecting direction changes along the one direction before bending forming. This preliminary shaping anticipates the fiber distribution needs during bending, preventing both fiber shortage and wrinkle formation without requiring additional material
Solution Approach 2:
The geometry of the deformable portion is specifically designed with varying length in the intersecting direction along the one direction. This parameter variation in the laminate's initial shape compensates for expected fiber distribution issues during bending forming, enabling wrinkle-free formation of arbitrary cross-sectional shapes
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
This approach effectively suppresses the generation of wrinkles in the laminate during bending forming, thereby maintaining the strength of the composite structure.
Implementation Method 1
a forming step of performing bending forming along a deformation line included in the deformable portion and extending in the one direction, to deform the deformable portion
Data Source
AI summary
A composite material structure body production method includes a layering step of layering a plurality of fiber sheets to form a layered body having a deforming portion extending in one direction, and a forming step of performing bend-forming along a deforming line contained in the deforming portion and extending in the one direction, thereby causing the deforming portion to deform. The layering step produces the layered body in such a manner that the shape of the deforming portion is a shape wherein: the cross-section shape in the one direction and the cross-section shape in an intersecting direction that intersects with the one direction are bent or curved; and the length in the intersecting direction changes along the one direction.