Stress-Engineered Component Fracture for Adaptive Functionality
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Solution Overview
Problem
Existing devices lack the ability to change functionality in a controlled, triggerable manner, which is essential for various applications.
Innovation Solution
A device with a stress-engineered portion comprising tensile and compressive stress layers that are self-equilibrating, allowing for controlled fracture in response to applied energy, thereby changing its functionality from one state to another.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a device is designed to change functionality in a controlled manner, then adaptability is improved, but device complexity increases due to the need for stress-engineered portions with multiple stress layers
Solution Approach 1:
The device is divided into a stress-engineered portion and a second portion, where the stress-engineered portion is further segmented into multiple stress layers with different residual stresses. This segmentation allows the fracture function to be isolated to a specific component, changing device functionality without requiring the entire device to be complex.
Solution Approach 2:
Residual stresses are pre-introduced into the stress layers during manufacturing, creating a stored energy state that enables controlled fracture when triggered. This preliminary action of stress introduction allows the device to change functionality on demand without requiring complex control systems during operation.
2Speed
If energy is applied to trigger fracture of the stress-engineered portion, then functionality change speed is improved, but risk of damaging the second portion increases
Solution Approach 1:
The stress-engineered portion has localized stress concentrations and fracture initiation sites designed into specific regions. When energy is applied, fracture propagates only through the stress-engineered portion due to its tailored stress distribution, preventing damage transmission to the second portion while enabling rapid functionality change.
Solution Approach 2:
The stress layers are designed with self-equilibrating residual stresses that contain the fracture energy within the stress-engineered portion. This pre-designed stress balance acts as a cushion, absorbing the energy release from fracture and preventing it from propagating to the second portion.
3Manufacturing precision
If multiple stress layers with different residual stresses are used, then control precision of fracture is improved, but manufacturing difficulty increases
Solution Approach 1:
Different residual stress values and distributions are introduced into multiple stress layers through controlled manufacturing parameters such as deposition conditions, heat treatment temperatures, and cooling rates. By adjusting these parameters, precise control over fracture initiation and propagation is achieved while using established manufacturing techniques.
Solution Approach 2:
The stress-engineered portion is constructed as a composite structure with multiple stress layers made from compatible materials that can be bonded together. This composite approach allows each layer to contribute different stress characteristics while maintaining structural integrity, achieving precise fracture control through material composition rather than complex single-material processing.
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 can alter its functionality by fracturing the stress-engineered portion, allowing for changes in mechanical, electrical, or optical functions without damaging the second portion, enabling adaptive performance according to different criteria.
Implementation Method 1
The stress-engineered portion includes at least one tensile stress layer having a residual tensile stress and at least one compressive stress layer having a residual compressive stress
Implementation Method 2
The stress-engineered portion is configured to fracture due to propagating cracks generated in response to energy applied to the stress-engineered portion
Data Source
AI summary
A device includes at least one stress-engineered portion and at least one second portion. The stress-engineered portion includes at least one tensile stress layer having a residual tensile stress and at least one compressive stress layer having a residual compressive stress. The tensile stress layer and the compressive stress layer are mechanically coupled such that the at least one tensile stress layer and the at least one compressive stress layer are self-equilibrating. The stress-engineered portion is configured to fracture due to propagating cracks generated in response to energy applied to the stress-engineered portion. Fracture of the stress-engineered portion changes functionality of the device from a first function to a second function, different from the first function.