3D Printed Crash Test Dummy Ribs With Constrained Layer Damping
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Solution Overview
Problem
Current crash test dummies' rib structures using 'free layer' damping do not accurately replicate the mechanical properties and human-like interaction of human ribs, necessitating a more advanced damping mechanism.
Innovation Solution
The development of three-dimensional ribs with constrained layer damping, achieved by sandwiching a layer of damping material between two layers of band material, utilizing a three-dimensional printing process that allows for the simultaneous printing of different materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If free layer damping is used by gluing damping material to the inside of a standard steel band, then the manufacturing process is simple, but the mechanical properties do not accurately replicate human ribs
Solution Approach 1:
The patent applies composite materials by combining band material layers with damping material layers to create a constrained layer damping structure. This composite construction replicates the mechanical properties of human ribs more accurately than single-material structures, while the layers are integrated through 3D printing technology.
Solution Approach 2:
The patent changes the physical parameters of the rib structure by transitioning from a single-layer steel band to a multi-layer composite structure with specific thicknesses and material properties. The constrained layer damping configuration modifies the mechanical behavior to better match human rib characteristics.
2Reliability
If a multi-layer constrained damping structure is implemented, then the mechanical impact response similitude improves, but the manufacturing process becomes more complex
Solution Approach 1:
The patent replaces traditional mechanical assembly methods (such as gluing and fastening separate damping layers) with 3D printing technology. This substitution allows the multi-layer constrained damping structure to be manufactured as an integrated component, simplifying the manufacturing process despite the structural complexity.
Solution Approach 2:
The patent applies local quality by using 3D printing to create varying material distributions and densities within different regions of the rib structure. This allows optimization of damping properties in specific areas while maintaining overall structural integrity, achieving human-like mechanical response.
3Reliability
If standard steel bands with glued damping material are used, then the production time is short, but the human-like interaction in collision testing is insufficient
Solution Approach 1:
The patent merges multiple manufacturing steps into a single 3D printing process. The band material layers and damping material layers are printed simultaneously or in sequence without requiring separate assembly operations, thereby maintaining production efficiency while achieving superior human-like interaction characteristics.
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 creates a more human-like rib structure with enhanced damping properties, improving the simulation of human mechanical impact responses in collision testing.
Implementation Method 1
The rib includes at least two layers of a band material and a layer of damping material sandwiched in between the at least two layers of the band material
Data Source
AI summary
A three-dimensional rib for a crash test dummy includes at least two layers of a band material and a layer of damping material sandwiched in between the at least two layers of the band material.