Rock Sample Fixing Device with Three-Jaw Chuck for Cyclic Loading
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Solution Overview
Problem
Current rock sample fixing devices are limited to unidirectional compression or tension tests, leading to inaccurate results, sample damage, and high labor intensity, and cannot conduct cyclic alternate compression and tension load tests.
Innovation Solution
A rock sample fixing device with a three-jaw chuck for cyclic tension and compression tests, incorporating hydraulic mechanisms and central position-limit mechanisms to ensure consistent loading rigidity and accurate alignment, allowing for cyclic alternate tension and compression load tests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a unidirectional compression test or tension measurement is conducted using a conventional sample fixing device, then the test can be performed with simple structure, but the test results are not accurate and the device cannot conduct cyclic alternate compression and tension load tests
Solution Approach 1:
The sample fixing device is designed with four central position-limit mechanisms (first, second, third, and fourth chucks) that can simultaneously constrain samples at multiple positions, enabling the device to perform both unidirectional compression/tension tests and cyclic alternate compression-tension load tests. This multi-functional capability allows a single device to replace multiple specialized devices.
Solution Approach 2:
The device divides the sample fixing function into four independent central position-limit mechanisms, each capable of constraining a sample at a specific position. These segmented mechanisms can be independently adjusted and positioned, allowing flexible configuration for different test types including cyclic loading tests.
2Measurement precision
If a unidirectional tension test is conducted with a conventional fixing device, then the device structure remains simple, but test results are not accurate and rock samples with low tensile strength are easily damaged
Solution Approach 1:
The four central position-limit mechanisms are positioned and adjusted before the test begins to precisely locate and constrain the sample at predetermined positions. This preliminary positioning ensures that the sample is correctly aligned and supported during loading, improving measurement accuracy and preventing damage to samples with low tensile strength.
Solution Approach 2:
The central position-limit mechanisms act as intermediary elements between the loading system and the sample. These chucks provide precise positional control and support, ensuring accurate force application and measurement while protecting the sample from misalignment-induced damage.
3Adaptability or versatility
If a unidirectional compression test is conducted where samples can only bear compression load, then the device structure is simple, but cyclic alternate compression and tension load tests cannot be conducted
Solution Approach 1:
The sample fixing device incorporates four adjustable central position-limit mechanisms that can dynamically adapt to different testing requirements. The mechanisms can be repositioned and reconfigured for cyclic alternate compression-tension tests, allowing the device to handle both compression and tension loads effectively without requiring manual reassembly.
4Ease of operation
If conventional sample fixing methods are used, then the device structure is simple, but it is not easy to operate and the labor intensity is relatively high
Solution Approach 1:
The four central position-limit mechanisms are designed to be self-aligning and self-constraining. Once positioned, each chuck automatically maintains the sample at the correct location throughout the test, reducing the need for continuous manual adjustment and lowering operational complexity despite the increased number of mechanisms.
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
Enables accurate and efficient cyclic alternate tension and compression load tests on rock samples, improving test accuracy and reducing labor intensity by ensuring consistent loading and protecting samples with low tensile strength.
Implementation Method 1
a hydraulic mechanism, which comprises a piston and a hydraulic cylinder assembled with the piston
Data Source
AI summary
A rock sample fixing device with a three-jaw chuck for cyclic tension and compression testing including: a lower clamp and an upper clamp; the lower clamp including a lower connector connected to a loading base at a bottom of a testing machine, a lower end cap for fixing samples, a lower chain connecting the lower connector and the lower end cap, a first central position-limit mechanism, a second central position-limit mechanism, and a first hydraulic mechanism; the upper clamp including an upper connector connected to a loading base at a top of the testing machine, an upper end cap for fixing samples, an upper chain connecting the upper connector and the upper end cap, a third central position-limit mechanism, a fourth central position-limit mechanism, and a second hydraulic mechanism.