Shape Memory Alloy Pressure Control Device
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Solution Overview
Problem
Conventional pressure relief and monitoring systems for fluid systems lack efficient, step-function control and reversible deformation capabilities, leading to suboptimal pressure management and safety concerns.
Innovation Solution
A device utilizing a shape memory alloy in an Austenitic phase that undergoes a reversible phase change from high to low modulus Martensitic phase in response to activation stress, enabling superelastic deformation and controlled pressure management through a member connected to a movable element, which can be configured as a pressure relief valve, monitoring device, or lock-out mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional pressure relief valves are used, then pressure control is provided, but the control is not step-function and the movable element is actuated before the activation stress occurs
Solution Approach 1:
The device utilizes phase change parameters of shape memory alloy (from Austenitic to Martensitic phase) to achieve step-function pressure control. The alloy's modulus changes dramatically during phase transformation, creating a binary on/off control state that eliminates gradual actuation and achieves precise threshold-based pressure relief.
Solution Approach 2:
The invention directly applies phase transition of shape memory alloy material to control pressure relief. The material transforms from high-modulus Austenitic phase to low-modulus Martensitic phase at a specific activation stress, creating a sharp step-function response that opens the valve only when the threshold is reached, preventing premature actuation.
2Reliability
If shape memory alloy member is used for pressure control, then step-function control and reversible deformation are achieved, but the device requires specific activation stress conditions
Solution Approach 1:
The shape memory alloy member is self-actuating and requires no external power source, control electronics, or manual intervention. It automatically responds to activation stress through intrinsic phase transformation, opening and closing the valve based solely on pressure conditions, thereby enhancing reliability while simplifying the overall system architecture.
Solution Approach 2:
The invention replaces complex mechanical pressure control systems (springs, diaphragms, adjustable mechanisms) with a smart material-based system. The shape memory alloy's inherent superelasticity and phase transformation replace traditional mechanical components, reducing manufacturing complexity despite the specialized material requirements.
3Productivity
If the member stretches in response to activation stress, then the movable element is translated for pressure relief, but the deformation must be reversible for continuous operation
Solution Approach 1:
The shape memory alloy member repeatedly discards its deformed state during pressure relief operation and recovers its original shape when pressure decreases. This reversible superelastic deformation allows the valve to cycle between open and closed states indefinitely, ensuring continuous operation and long service life without permanent material degradation.
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 device provides precise, step-function control of pressure and reversible deformation, maintaining specific pressure ranges and preventing inadvertent fluid release, enhancing safety and efficiency in fluid system management.
Implementation Method 1
The member is configured to undergo a phase change from a high modulus Austenitic phase to a low modulus Martensitic phase in response to an activation stress
Implementation Method 2
The phase change is accompanied by stretching of the member; this stretching, which is reversible, being termed superelasticity
Data Source
AI summary
A device is provided that may be adapted to control or monitor the pressure level of a fluid system. The device includes a member composed of a shape memory alloy in a superelastic state. The member is configured to undergo a phase change from a high modulus Austenitic phase to a low modulus Martensitic phase and stretch in response to an activation stress. In one embodiment, the member defines two ends such that one end of the member is operatively connected to a fixed point. Another end of the member is operatively connected to a movable element. As the member stretches in response to the activation stress, the movable element is translated relative to the fixed point. In another embodiment, the member includes two plates with respective holes that are selectively aligned when the first and second plates stretch or deform in response to the activation stress.