Carbon Foam Shock-Absorbing Lining for Radioactive Material Packaging
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Solution Overview
Problem
Carbon foam linings used in shock-absorbing protection elements for radioactive material packaging exhibit unpredictable compression behavior, leading to superficial damage and instability during impact tests, which complicates sizing and energy absorption.
Innovation Solution
Introducing structural irregularities such as re-entrant angles, protuberances, or coatings to the carbon foam linings to ensure consistent energy absorption and prevent superficial damage, allowing for deeper cracking and improved impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If carbon foam lining is used in shock-absorbing protection elements, then energy absorption capability is improved, but compression behavior becomes unpredictable with superficial damage
Solution Approach 1:
The patent applies preliminary action by creating structural irregularities (protrusions, recesses, voids) within the carbon foam lining before impact occurs. These pre-existing features initiate deep cracking at controlled locations during compression, preventing the unpredictable superficial damage plate phenomenon and ensuring consistent energy absorption behavior throughout the deformation process.
2Stability of the object's composition
If carbon foam lining is confined in a rigid envelope, then structural stability is improved, but compression behavior becomes unfavorable with extended damage plate
Solution Approach 1:
The patent applies local quality by introducing localized structural irregularities (specific protrusions, recesses, or voids) at particular locations within the carbon foam lining. These localized features create controlled stress concentration points that initiate deep cracking at specific locations during compression, preventing the extended damage plate phenomenon while maintaining overall structural stability provided by the rigid envelope.
3Ease of manufacture
If wood is used for shock-absorbing lining, then ease of shaping is improved, but material stability in temperature and humidity is worsened
Solution Approach 1:
The patent applies parameter changes by transitioning from organic wood materials to synthetic carbon foam materials. This material substitution fundamentally changes the physical and chemical parameters of the lining, providing superior dimensional stability and consistent mechanical properties across varying temperature and humidity conditions, while still achieving the required shock-absorbing performance through controlled structural irregularities.
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 modifications ensure consistent behavior during impact, preventing superficial damage and enhancing the lining's ability to absorb energy effectively, thereby improving the packaging's safety and compliance with regulatory standards.
Implementation Method 1
the stress to be exerted (in megapascals, on the ordinate) to subject the lining 7 to an increasing strain (in relative values, on the abscissa)
Implementation Method 2
the maximum admissible crushing rate of the order of 60%
Implementation Method 3
the plate 11 is the consequence of an initial peak 13, which expresses the often high stress which is necessary to inflict the first damage to the lining 7
Data Source
Figure 1~2
Figure 3~5
Figure 6~7
AI summary
The invention relates to a block of a shock-absorbing protection element consisting of a rigid and fragile carbon foam, said block being provided with structural, superficial or internal irregularities (20), and having sharp-angled edges in the foam to enable the immediate crushing thereof by cracks which extend depth-wise throughout the entire volume thereof, stimulating the fragmentation thereof with foreseeable characteristics. As a variant, the following can be applied: a hardening surface coating (28) filling the outer pores (27) of the foam, lateral play with the envelope, or projections lining the inside of the envelope. The invention applies to shock-absorbing protection elements, which especially cover packagings that may be liable to fall.