SMA Composite Fabric Joints for Diving Suit Mobility
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Solution Overview
Problem
Conventional atmospheric diving suits (ADS) limit diver mobility and maneuverability due to their rigid construction and lack of shape memory alloys, which restricts freedom of movement and requires ancillary equipment for long transits at depth.
Innovation Solution
Incorporating shape memory alloy (SMA) composite fabric into the joints of the diving suit, allowing the SMA to transform between a martensite phase for flexibility and an austenite phase for rigidity, enabling the suit to maintain a safe internal pressure while allowing for greater mobility and ease of use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional rigid construction is used in atmospheric diving suits, then pressure resistance is improved, but diver mobility and maneuverability deteriorate
Solution Approach 1:
The diving suit incorporates shape memory alloy joints that can dynamically change their mechanical properties between rigid and flexible states. The SMA joints transform from austenite phase (rigid, pressure-resistant) to martensite phase (flexible, mobile) based on temperature changes, allowing the suit to adapt its stiffness characteristics to different operational requirements.
Solution Approach 2:
The invention utilizes temperature-induced phase transformation in shape memory alloys to change the mechanical parameters of the joint structures. By controlling the temperature of the SMA material, the suit can transition between a rigid pressure-resistant state and a flexible mobile state, effectively resolving the contradiction between strength and ease of operation.
2Ease of operation
If shape memory alloy composite fabric is used in joints, then diver mobility is improved, but structural rigidity deteriorates
Solution Approach 1:
The shape memory alloy joints provide dynamic rigidity control, transitioning from flexible martensite phase during movement to rigid austenite phase when pressure resistance is required. This dynamic adaptation allows the structure to be flexible when needed for mobility and rigid when needed for pressure containment.
Solution Approach 2:
The invention exploits the reversible phase transition between martensite and austenite in shape memory alloys to control joint rigidity. The phase transition is triggered by temperature changes, allowing the material to transform from a flexible state (martensite) to a rigid state (austenite), thereby providing both mobility and structural integrity as required.
3Stability of the object's composition
If conventional rigid joints are used, then pressure maintenance is improved, but freedom of movement deteriorates
Solution Approach 1:
The shape memory alloy joints utilize phase transitions to maintain pressure stability while enabling movement. During articulation, the SMA material transforms to the flexible martensite phase allowing range of motion, then returns to the rigid austenite phase to maintain pressure integrity, providing both adaptability and stability.
Solution Approach 2:
By changing the temperature parameter of the shape memory alloy material, the joint's mechanical properties are adjusted to allow movement when flexible and maintain pressure when rigid. This parameter control enables the system to adapt between different functional states while maintaining overall system stability.
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 SMA composite fabric joints provide enhanced mobility and dexterity underwater by transforming between phases to maintain one atmosphere pressure, reducing the need for external equipment and increasing the duration of dives without compromising reliability.
Implementation Method 1
the vessel includes a shape memory alloy (SMA) composite fabric having a martensite phase and an austenite phase. In the martensite phase, the SMA composite fabric is elastic. In the austenite phase, the SMA composite fabric is rigid
Implementation Method 2
The shape memory alloy composite fabric joints are rigid in an austenite phase to maintain a pressure of one atmosphere in an interior of the suit. The shape memory alloy composite fabric joints are flexible in a martensite phase to enable freedom of movement in the joints
Data Source
AI summary
A shape memory alloy composite fabric and a method of use is provided in underwater pressure vessels and as flexible joints in atmospheric diving suits. The atmospheric diving suit internal pressure is one atmosphere for underwater transit to and from an underwater work site. During operations at a work site, the shape memory alloy joints transform to a martensite phase and enable greater flexibility while the pressure in the atmospheric diving suit equalizes with ambient depth pressure.