Dilatant Bypass Element Protects Anchor Bolt Sensors
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Solution Overview
Problem
Direct tension indicators used in concrete anchors often fail to function reliably due to high impact forces during the hammering step, which can damage or weaken the dye-filled sensors, leading to premature dye discharge and incorrect tension readings.
Innovation Solution
Incorporating a bypass element with a dilatant material that absorbs short-duration impact forces, protecting the sensor from damage while allowing longer-duration forces to be detected, ensuring accurate tension measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If direct tension indicators are used in concrete anchors, then tension measurement is enabled, but the sensor reliability deteriorates due to impact forces during hammering
Solution Approach 1:
A bypass element made of dilatant material is introduced as an intermediary between the impact forces and the sensor. This bypass element absorbs short-duration impact forces during hammering while allowing long-duration tension forces to reach the sensor, thereby protecting the sensor from damage while maintaining measurement capability
Solution Approach 2:
The bypass element utilizes the time-dependent viscosity parameter change of dilatant material. The material exhibits high resistance to deformation under short-duration impact forces (less than 0.1 seconds) but becomes deformable under long-duration forces (more than 3 seconds), automatically adapting its mechanical properties based on the duration of the applied force
2Reliability
If the sensor is protected from impact forces, then sensor damage is prevented, but the ability to detect actual load forces may be compromised
Solution Approach 1:
The bypass element's mechanical properties are made dynamic through the use of dilatant material, which automatically adjusts its resistance to deformation based on the duration of the applied force. This dynamic behavior allows the system to differentiate between short-duration impact forces (which are bypassed) and long-duration tension forces (which are transmitted to the sensor)
Solution Approach 2:
The system exploits the temporal periodicity or duration characteristics of different force types. Impact forces occur as brief, periodic strikes during hammering, while tension forces are sustained and continuous. The bypass element's time-dependent response allows it to selectively filter based on this temporal pattern
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 dilatant material effectively dissipates impact forces during hammering, preventing sensor damage and ensuring reliable tension indication by bypassing brief impacts and allowing longer-duration forces to be sensed, thus maintaining accurate tension measurement in concrete anchors.
Implementation Method 1
The bypass element has a dilatant material, at least in certain areas, by means of which the impact forces are dissipated. Such a dilatant material is characterized in that it resists deformation if a force is applied over a short period of time, for instance, less than 0.1 seconds, and yet it is deformable if the force is applied for a longer period of time
Data Source
AI summary
A sensor arrangement, for example, on an anchor bolt, including at least one sensor (10). At least one bypass element (20) with a dilatant material is arranged in the area of the sensor (10), whereby impact forces that act upon the sensor (10) can be dissipated via the dilatant material of the bypass element (20).