Spiral Composite Energy Absorber for Low-Recoil Impact Loading
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Solution Overview
Problem
Existing energy absorption members using E glass fibers face issues with unstable impact absorption due to non-uniform fracture propagation, while those using carbon fibers experience excessive recoil during impact.
Innovation Solution
A hollow cylindrical fiber-reinforced composite material with reinforcement fibers arranged in a spiral pattern, where the tensile strength, tensile modulus of elasticity, and elongation rate satisfy specific ratios, and the volume content of fibers is between 30% and 80%, ensuring uniform fracture propagation and reduced recoil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If E glass fibers are used as reinforcement fibers, then the energy absorption member can be manufactured, but the impact absorption is unstable because fracture propagation is non-uniform
Solution Approach 1:
The patent changes the physical and chemical parameters of the reinforcement fibers by specifying precise ranges for tensile strength (3.5-5.0 GPa), tensile modulus of elasticity (70-90 GPa), and elongation rate (4.0-6.0%). These parameter changes ensure uniform fracture propagation and stable impact absorption, resolving the reliability issue with E glass fibers.
Solution Approach 2:
The patent creates a composite material system combining reinforcement fibers with specific mechanical properties and a curable resin composition. This composite structure with controlled fiber parameters achieves both manufacturability and stable impact absorption, eliminating the fracture propagation uniformity problem.
2Reliability
If carbon fibers are used as reinforcement fibers, then the energy absorption member can be manufactured, but the recoil at the moment of receiving impact is strong
Solution Approach 1:
The patent controls the tensile modulus of elasticity of the reinforcement fibers within 70-90 GPa and elongation rate within 4.0-6.0%. These parameter changes optimize the fiber's ability to absorb impact energy while limiting recoil force, resolving the contradiction between reliable impact absorption and excessive recoil.
3Strength
If the volume content of reinforcement fibers is increased, then the strength increases, but the fracture propagation becomes non-uniform and impact absorption becomes unstable
Solution Approach 1:
The patent optimizes the volume content of reinforcement fibers to a specific range (30-80%) and combines it with controlled fiber properties (tensile strength 3.5-5.0 GPa, tensile modulus 70-90 GPa, elongation rate 4.0-6.0%). This balanced parameter optimization achieves both high strength and uniform fracture propagation, resolving the contradiction between strength and impact absorption stability.
Data Source
Figure 1~2
AI summary
Provided is an energy absorption member in which the recoil at the moment of receiving an impact is small, and fracture by impact propagates uniformly enabling stable absorption of the impact. An energy absorption member (21) includes a hollow cylindrical fiber-reinforced composite material including reinforcement fibers (22), in which tensile strength S (GPa), tensile modulus of elasticity M (GPa), and elongation rate E (%) satisfy the following expression (1), and a curable resin composition with which the reinforcement fibers (22) are impregnated. The volume content of the reinforcement fibers (22) in the fiber-reinforced composite material is 30 to 80%. 11.0≤S2×M1/8/E1/2≤22.0