Prestressed Stone Blocks for Metal Replacement
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Solution Overview
Problem
Natural stones and ceramics exhibit high compressive strength but are unstable under tensile and bending stress, necessitating reinforcement with fiber materials, yet existing methods do not effectively prestress these materials to manage internal stresses and thermal expansion.
Innovation Solution
The use of shrinking resin-impregnated fabric layers and subsequent bending to create prestressed stone slabs, which are then assembled into blocks with calculable internal prestress, utilizing plant or carbon fibers for enhanced tensile stability, and further reinforced with heat-resistant matrices to manage thermal loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If natural stone and ceramics are reinforced with fiber materials to stabilize them under tensile and bending stress, then their tensile stability is improved, but their internal flexibility and ability to manage internal stresses are reduced
Solution Approach 1:
The patent applies parameter changes by transforming the stress state of the stone material through controlled prestressing. The fiber reinforcement is tensioned to specific force levels (e.g., 5-20 kN) and anchored in a way that creates predetermined compressive stresses in the stone, changing its mechanical parameters from unstable to stable under service loads.
Solution Approach 2:
The invention implements preliminary action through the prestressing process where fiber materials are tensioned before the stone structure is subjected to service loads. This preliminary tensing of fibers creates initial compressive stresses that counteract future tensile stresses, preventing cracking and enhancing durability before the structure is put into use.
2Strength
If metal components are used in industrial applications, then high strength and durability are achieved, but CO2 emissions and energy consumption increase significantly
Solution Approach 1:
The patent changes the material parameter from metal to prestressed stone-composite, achieving comparable structural strength through a different mechanism. The stone material is stabilized by fiber prestressing, allowing it to reach tensile strengths sufficient for industrial applications while maintaining the inherent low-carbon footprint of stone materials.
Solution Approach 2:
The invention utilizes abundant natural stone materials that require minimal processing and have low embodied energy compared to metals. The fiber reinforcement system is designed to work with locally available stone, reducing transportation emissions and creating a sustainable alternative to energy-intensive metal production.
3Reliability
If stone slabs are stabilized with fiber materials, then their resistance to breaking is improved, but their flexibility and adaptability to thermal loads are reduced
Solution Approach 1:
The patent applies parameter changes by controlling the prestress level in fiber materials to specific ranges that maintain both structural integrity and thermal adaptability. The prestress is calibrated so that under thermal expansion, the fibers can relax slightly without losing overall stability, allowing the structure to accommodate temperature variations while preventing catastrophic failure.
Solution Approach 2:
The invention introduces dynamics by allowing the fiber-stone composite to adapt its stress distribution in response to thermal loads. The prestressed fibers act as a dynamic constraint that can accommodate expansion and contraction movements, maintaining reliability while preserving the structure's ability to respond to environmental changes.
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 results in environmentally friendly, high-pressure-stable, and low-CO2-emission stone materials that can replace metals in industrial applications, offering superior damping properties and reduced energy consumption, with improved flexibility and resistance to thermal expansion.
Implementation Method 1
The use of shrinking resin-impregnated fabric layers and subsequent bending to create prestressed stone slabs
Implementation Method 2
further reinforced with heat-resistant matrices to manage thermal loads
Data Source
Figure 1a~1b
Figure 2
Figure 3
AI summary
The invention relates to the stabilization of more or less thin stone slabs by means of carrier materials which optionally prestress the stone, whereupon the stone slabs are placed on top of each other to form entire blocks and are non-positively connected in order to produce a basic block material which is mechanically and thermally stable in a large area towards the outside and the inside without the stone structure being damaged when shaken or subject to mechanical or thermal stress; instead, the stone structure remains permanently stable. It is thus possible to produce entire engine blocks from natural stone, for example. Said stone blocks can replace metal blocks that are polluted by large amounts of CO2 emissions. It is also possible to produce slab material that is resistant to twisting and can be used for constructing houses and buildings and manufacturing automobiles, boats, and aircraft.