High-Temperature Plane Strain Compression Fixture
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Solution Overview
Problem
Conventional plane strain compression tests on metal materials using Gleeble thermal simulation testers face issues such as ignored strain in the perpendicular direction, non-uniform temperature distribution, and tangential deformation, leading to inaccurate data and sample distortion.
Innovation Solution
A high-temperature plane strain compression test device comprising special-shaped pressure heads made of YG8 hard alloy steel, fixed plates of high-temperature alloy, and alumina ceramic shim plates, which limits deformation and ensures accurate strain measurement by maintaining uniform temperature and reducing tangential deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a large sample is used for compression test, then the test can be carried out on conventional equipment, but the temperature is not distributed uniformly and the data is inaccurate
Solution Approach 1:
The invention segments the sample into a smaller尺寸 while using multiple pressure heads (upper and lower pressure heads with side and end constraints) to compensate for the reduced sample size. This segmentation allows uniform temperature distribution while maintaining test validity through the specialized fixture configuration that constrains deformation in specific directions.
Solution Approach 2:
The invention introduces intermediary components (side shim plates, end shim plates, and fixed plates) that act as mediators between the pressure heads and the sample. These intermediaries enable precise control of the deformation field and ensure uniform temperature distribution by creating a constrained geometry that facilitates even heat distribution during testing.
2Reliability
If a conventional long and narrow hammer is used as compression anvil, then the test setup is simple, but there is no strain in the perpendicular direction which ignores the plane strain problem
Solution Approach 1:
The invention employs asymmetric pressure head design where the upper and lower pressure heads have specific dimensional relationships (width and length ratios) that create the desired plane strain condition. The asymmetric configuration of side and end constraints generates the appropriate stress state with strain in two directions while constraining the perpendicular direction, accurately representing plane strain problems.
Solution Approach 2:
The invention transitions from a simple uniaxial compression setup to a multi-dimensional constrained deformation system. By introducing side and end constraints that limit deformation in specific directions while allowing strain in other directions, the device creates a controlled plane strain state that accurately represents two-dimensional deformation behavior.
3Manufacturing precision
If compression deformation is tested with conventional setup, then the test procedure is straightforward, but the tangential deformation tendency along the 45° direction is obvious which influences tissue observation
Solution Approach 1:
The invention applies local quality control through specifically designed pressure head geometries and constraint configurations that target and control deformation in specific local regions. The side and end shim plates create localized constraints that suppress tangential deformation along the 45° direction while maintaining overall test simplicity through standardized component assembly.
Data Source
AI summary
A device for implementing a high-temperature plane strain compression test on a thermal simulation tester is provided. High-hardness and special-shaped pressure heads are located at the upper and lower ends of a sample; side shim plates and end shim plates with insulation and high pressure resistance are respectively located in grooves in the end faces and the inner sides of high-strength fixed plates, and the combined fixed plates are respectively located on the left and right sides of the sample; and the combined fixed plates are fixed via four through holes of the fixed plates by high-strength bolts, washers and nuts to limit the plane strain problem caused by the deformation of the sample in the normal direction of the fixed plates.