Exploding Bridge Wire Bond Strength Testing
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Solution Overview
Problem
Conventional bond strength testing methods, particularly for composite materials, are costly and inefficient, especially for complex structures, as they require expensive and large-scale laser systems that are difficult to transport and operate, and lack effective nondestructive evaluation methods for in-service inspection and repair.
Innovation Solution
A nondestructive bond strength testing system utilizing an expendable device with a patterned planar array of exploding bridge wires that generates a planar compression wave upon electrical pulse, allowing for precise control of energy and detection of disbond signatures using sensors, enabling automated and cost-effective evaluation of bond strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional laser bond strength testing methods are used, then bond strength can be tested nondestructively, but the laser system is very expensive, large in size, requires environmental controls and significant electrical power (>10 kW), and is difficult to transport
Solution Approach 1:
The patent extracts the core function of laser bond strength testing (generating compression waves to induce tension waves for bond inspection) and implements it using a simplified electrical pulse system with bridge wires instead of a complex laser system. This removes the need for expensive, large-scale laser equipment while maintaining the essential testing capability.
Solution Approach 2:
The patent replaces the optical/mechanical laser system with an electrical system that uses electrical pulses to vaporize bridge wires, generating compression waves mechanically. This substitution eliminates the need for complex laser equipment, environmental controls, and high electrical power requirements while achieving the same bond strength testing function.
2Measurement precision
If static proof testing is used to determine bond strength, then the maximum load capacity can be determined, but the cost of testing is high
Solution Approach 1:
The patent uses inexpensive, disposable bridge wires that are electrically pulsed to generate compression waves. These simple, low-cost components replace expensive static proof testing equipment while providing sufficient measurement precision for bond strength evaluation through the generated tension waves.
Solution Approach 2:
The patent changes the testing approach from static mechanical loading to dynamic wave-based inspection by vaporizing bridge wires with electrical pulses. This parameter change allows bond strength measurement without the high costs associated with traditional static proof testing to limit load.
3Reliability
If witness coupons are used to validate bond strength, then quality indication is provided, but the coupons are not part of the real structure and are not available for in-service inspection or repair
Solution Approach 1:
The patent creates a universal bond strength testing method using electrical pulses and bridge wires that can be applied to both manufacturing validation and in-service inspection. The same simple equipment and methodology work for both new component validation and field inspection, providing adaptability across different stages of the product lifecycle.
Solution Approach 2:
The testing method uses the structure's own surfaces and bonding interfaces directly, without requiring separate witness coupons. The compression waves generated by the bridge wires directly interrogate the bond strength at the actual inspection location, making the structure itself the test subject rather than a separate coupon.
4Difficulty of detecting and measuring
If conventional nondestructive evaluation methods such as ultrasonics, x-rays, and acoustics are used, then defect presence can be detected, but bond strength cannot be measured
Solution Approach 1:
The patent uses mechanical vibration in the form of compression waves generated by vaporizing bridge wires. These waves propagate through the bonded structure and reflect as tension waves from bonding interfaces, allowing direct measurement of bond strength through wave analysis rather than indirect defect detection.
Solution Approach 2:
The patent utilizes the phase transition of the bridge wire material from solid to vapor when electrical pulses vaporize the bridge wires. This rapid phase transition generates the compression waves needed to interrogate bond strength, combining a physical effect with wave-based measurement capability.
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 provides a cost-effective, automated, and nondestructive method for evaluating bond strength in complex structures, capable of detecting disbond signatures without damaging the materials, thus overcoming the limitations of traditional methods.
Implementation Method 1
simultaneously vaporizing the patterned planar array of exploding bridge wires by applying a pulse of electrical energy to the patterned planar array of exploding bridge wires
Implementation Method 2
simultaneously vaporizing the patterned planar array of exploding bridge wires
Implementation Method 3
creating a planar compression wave into a surface of the structure under test and a tension wave upon reflection from an opposing surface of the structure under test
Implementation Method 4
sensing an initial disbonding signature of the structure under test
Data Source
AI summary
A nondestructive bond strength testing method, including: coupling an expendable device to a structure under test, the expendable device including a patterned planar array of exploding bridge wires; simultaneously vaporizing the patterned planar array of exploding bridge wires by applying a pulse of electrical energy to the patterned planar array of exploding bridge wires; and sensing an initial disbonding signature of the structure under test.