Composite Material Assembly With Directional Bending Stiffness
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Solution Overview
Problem
Existing materials exhibit a linear relationship between stress and strain, leading to a tradeoff between flexibility and structural stiffness, making it difficult to achieve desired characteristics in products that require variable modulus materials for specific bending directions.
Innovation Solution
A joined fiber-reinforced composite material assembly with tunable anisotropic properties, comprising a first layer with a lower compressive modulus and a second rigid layer, allowing for different bending resistances in opposite directions by elastically buckling under compression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional isotropic or anisotropic materials are used to construct beams, then the beam can have uniform properties in all directions or directionally dependent properties, but the beam has an inherent inability to exhibit low bending resistance in one direction and high bending resistance in the other direction simultaneously
Solution Approach 1:
The patent employs composite beam construction combining multiple materials with different mechanical properties (isotropic and anisotropic materials) to achieve directionally dependent bending resistance. The composite structure allows the beam to exhibit low bending resistance in one direction while maintaining high bending resistance in the perpendicular direction, resolving the technical contradiction by integrating materials with complementary properties.
Solution Approach 2:
The invention applies different material properties to different regions and orientations of the beam structure. By configuring the composite materials with specific grain directions and mechanical properties in different layers, the beam achieves locally optimized bending resistance characteristics that vary by direction, enabling simultaneous low resistance in one direction and high resistance in another.
2Ease of operation
If materials providing enhanced flexibility are used in sole assembly, then the sole can bend and flex with the wearer's foot, but structural stiffness and stability are sacrificed
Solution Approach 1:
The sole assembly uses composite construction combining flexible isotropic materials with stiffer anisotropic materials having specific grain orientations. This composite structure enables the sole to provide enhanced flexibility for natural foot movement while simultaneously maintaining the structural stiffness and stability needed for protection and support, resolving the tradeoff between flexibility and strength.
Solution Approach 2:
Different regions of the sole assembly utilize materials with locally optimized properties. The composite structure configures materials to provide flexibility in areas requiring foot movement while maintaining stiffness in areas requiring structural support, allowing the sole to adapt to local functional requirements throughout its structure.
3Stability of the object's composition
If materials with constant stiffness are used, then the material provides consistent structural support, but the ability to increase stiffness as a function of strain is lost
Solution Approach 1:
The composite beam construction combines materials with different stress-strain characteristics, including non-linear anisotropic materials. This composite structure enables the beam to exhibit variable modulus behavior where stiffness increases as a function of strain, while maintaining stable compositional properties. The integration of multiple material types provides both the variability and stability required.
Solution Approach 2:
The invention incorporates materials and structural configurations that dynamically adjust stiffness based on applied strain. The composite structure and anisotropic material properties enable the beam to transition from a constant stiffness state to a variable stiffness state where resistance increases with strain, allowing the structure to adapt its mechanical properties in response to loading conditions.
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 assembly provides enhanced flexibility in one direction while maintaining high resistance to bending in the other, addressing the need for variable modulus materials that increase stiffness as a function of strain.
Implementation Method 1
a first layer with a lower compressive modulus and a second rigid layer, allowing for different bending resistances in opposite directions by elastically buckling under compression
Data Source
AI summary
An anisotropic composite material assembly comprising a first layer with a tensile modulus different from its compressive modulus and that exhibits variable modulus behavior. The first layer elastically buckle under compressions. A second layer has a tensile modulus substantially the same as its compressive modulus. The first and second layers are joined together, and the assembly is bendable in a first direction with an outer surface of the first layer being in compression and the assembly has a first bending stiffness during bending in the first direction. The assembly is bendable in a second direction opposite the first direction with the outer surface of the first layer being in tension, and the assembly has a second bending stiffness greater than the first bending stiffness during bending in the second direction.