Multi-scale Tensile Testing Apparatus with Multi-axis Sensing
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Solution Overview
Problem
Conventional tensile tests face challenges in accurately measuring mechanical properties of small-scale materials due to difficulties in specimen gripping and alignment, particularly at the nano-scale, where precise force application and alignment are required to achieve accurate stress-strain data.
Innovation Solution
A mechanical test system incorporating an X-Y automated stage, a multi-function nanotensile transducer head assembly with decoupled Z displacement sensor, and additional sensing means for measuring forces normal to the tensile axis, enabling precise alignment and force application across multiple scales, from nano-Newton to Newton, and allowing for microgripping and nano-scale imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional tensile testing methods are used, then testing at larger scales is feasible, but measurement accuracy deteriorates at small-scale (millimeter to sub-millimeter range)
Solution Approach 1:
The system divides the testing apparatus into multiple specialized components: an X-Y automated stage for lateral positioning, a Z-automated stage for axial loading, and a multi-function nanotensile transducer head assembly with decoupled sensors for each axis. This segmentation allows each component to be optimized for its specific function, achieving high measurement accuracy across multiple scales.
Solution Approach 2:
The patent introduces multi-axis sensing capability (X, Y, and Z axes) to the traditionally single-axis tensile testing system. By adding sensors for forces normal to the tensile axis (X and Y directions) in addition to the Z-axis force sensor, the system can detect misalignment and compensate for it, thereby maintaining measurement accuracy across different specimen sizes and orientations.
2Ease of operation
If specimen alignment tolerance is relaxed to 3-degree range, then ease of operation improves, but measurement accuracy deteriorates due to non-Z-axis errors
Solution Approach 1:
The system incorporates additional sensing means that measure forces normal to the tensile axis (X and Y directions). These sensors provide feedback about specimen misalignment, allowing the control system to detect and correct alignment errors automatically, thereby maintaining measurement accuracy without requiring extremely tight manual alignment.
Solution Approach 2:
The patent replaces purely mechanical alignment procedures with an automated sensing and correction system. Instead of relying on manual alignment within tight tolerances, the system uses electronic sensors to detect misalignment and automatically compensates for it, substituting mechanical precision requirements with electronic measurement and control capabilities.
3Measurement precision
If decoupled Z displacement sensor is implemented, then measurement precision improves, but device complexity increases
Solution Approach 1:
The transducer head assembly is segmented into functionally independent components: force sensors for X and Y directions, a decoupled Z displacement sensor, and a multi-function nanotensile transducer. This segmentation allows each sensor to be optimized for its specific measurement task without interfering with others, improving overall measurement precision while organizing complexity into manageable modular units.
Data Source
AI summary
A tensile testing apparatus is provided, and generally includes an X-Y automated stage, and a first specimen holder for holding and transferring force to a specimen to a first portion of a specimen. The first specimen holder is operatively supported by the X-Y automated stage. A Z-automated stage, a multi-function nanotensile transducer head assembly, and a second specimen holder for holding and transferring force to a second portion of the specimen is further provided. The second specimen holder is operatively linked to the Z-automated stage via the nanotensile transducer head assembly. Variable displacement modalities, and non-Z alignment assessment and adjustment are enabled by the multi-function nanotensile transducer head assembly, as well as the X, Y, and Z automated stages.