Composite Titanium Plate Fixture for Twist-Free Cyclic Loading
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Solution Overview
Problem
Existing electro-assisted tension-compression tests for ultra-thin titanium sheets face challenges such as torsional deformation, buckling, and wrinkling due to thinness, and the use of wire interfaces leads to kinking issues.
Innovation Solution
A composite tension-compression specimen is formed by fixing outer specimens on both sides of the ultra-thin titanium plate, with electric-assisted clamps applying lateral force and conductive structures for current transmission, avoiding torsional deformation and ensuring uniform force transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the ultra-thin titanium plate specimen is tested directly without outer specimens, then the specimen thickness is minimized for accurate testing, but the specimen is prone to twisting deformation and buckling during compression
Solution Approach 1:
The specimen system is segmented into three parts: two outer specimens made of insulating material and one ultra-thin titanium plate specimen in the middle. The outer specimens have higher thickness (0.5-0.7mm) to provide stability and prevent buckling, while the ultra-thin titanium plate (thickness 0.01-0.05mm) remains thin enough for accurate mechanical property testing. This segmentation allows each component to fulfill its specific function without compromising the other.
Solution Approach 2:
The invention uses composite material construction by combining insulating outer specimens (made of materials like glass fiber composite, PEEK, or carbon fiber-glass fiber composite) with the ultra-thin titanium plate specimen. The outer specimens are bonded to both sides of the titanium plate using adhesive layers, forming a composite structure that provides both mechanical stability and electrical insulation properties.
2Extent of automation
If wire interfaces are used for current transmission in electro-assisted testing, then current can be applied to the specimen, but the wire connection is prone to kinking and causing testing failure
Solution Approach 1:
The outer specimens serve as an intermediary medium for current transmission. Instead of directly connecting wires to the ultra-thin titanium plate specimen, the current is transmitted through the outer specimens which are already bonded to the titanium plate. This eliminates the need for separate wire interfaces and their associated kinking problems, while still enabling electro-assisted testing functionality.
3Stability of the object's composition
If the specimen thickness is increased to prevent buckling, then specimen stability improves, but the specimen becomes difficult to clamp and the testing accuracy decreases
Solution Approach 1:
The specimen system is segmented into three parts: two outer specimens made of insulating material and one ultra-thin titanium plate specimen in the middle. The outer specimens have higher thickness (0.5-0.7mm) to provide stability and prevent buckling, while the ultra-thin titanium plate (thickness 0.01-0.05mm) remains thin enough for accurate mechanical property testing. This segmentation allows each component to fulfill its specific function without compromising the other.
4Device complexity
If only clamping plates and sample fixtures are used without lateral force application, then the testing setup is simple, but the ultra-thin titanium sheet undergoes torsional deformation and wrinkling
Solution Approach 1:
The clamping plates apply lateral force (counterforce) perpendicular to the compression direction to counteract the torsional deformation and wrinkling tendencies of the ultra-thin titanium plate during compression testing. This lateral support acts as a counterbalancing mechanism that stabilizes the specimen without adding complex active control systems.
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 method prevents twisting and buckling, allowing smooth testing and accurate characterization of mechanical behavior under complex loading paths, supporting electro-assisted forming processes.
Implementation Method 1
the conductive structure contacts the composite tension-compression specimen to transfer current to the composite tension-compression specimen through the conductive structure to heat it
Data Source
AI summary
The present invention discloses an electro-assisted tension-compression cyclic loading device and testing method for ultra-thin titanium plates. The device comprises a composite tension-compression specimen, wherein a lateral force is applied to both sides of the composite tension-compression specimen; two pairs of electro-assisted fixtures, respectively clamping both ends of the composite tension-compression specimen, include two oppositely arranged clamping heads. The clamping surface of the clamping heads have a conductive structure, and the conductive structure is connected to an external power source, so that when the composite tension-compression specimen is clamped on the clamping head, the conductive structure contacts the composite tension-compression specimen to transfer current to the composite tension-compression specimen through the conductive structure to heat it. The clamping head is further connected to the loading end of a universal testing machine. The present invention can avoid torsional deformation of the ultra-thin titanium plate specimen during the test.