Hopkinson Bar Loading System for Multi-Field Coupling
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Solution Overview
Problem
Current testing methods cannot comprehensively assess the dynamic mechanical response of coal and rock masses under simultaneous coupling actions of water, gas, temperature, and static/dynamic loads, which is crucial for safe and sustainable mining of residual coal resources.
Innovation Solution
A loading system and method for a Hopkinson pressure bar test that simulates multi-field coupling actions of water, gas, and temperature, incorporating a sample sealed cabin, gas and water pressure loading devices, temperature control, and dynamic/static combined loading devices to apply controlled loads and simulate real mining conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate testing methods are used for water, gas, and temperature coupling actions, then individual field effects can be studied, but comprehensive multi-field coupling testing cannot be achieved
Solution Approach 1:
The patent combines water pressure loading device, gas pressure loading device, and temperature loading device into a single integrated testing system. The sealed cabin integrates water inlet/outlet, gas inlet/outlet, and temperature control functions, allowing simultaneous multi-field coupling tests that were previously impossible with separate testing methods.
Solution Approach 2:
The testing system is designed with multi-functional capabilities to handle water pressure, gas pressure, and temperature loading simultaneously. The sealed cabin and loading devices can perform various coupling tests (water-gas, water-temperature, gas-temperature, and triple coupling) on coal and rock samples, making the system universally applicable for different coupling scenarios.
2Reliability
If existing testing devices are used, then simple dynamic impact tests can be performed, but tests under simultaneous water-gas-temperature coupling and static load cannot be conducted
Solution Approach 1:
The patent merges the dynamic impact loading device with static load loading device into a unified system. The static load is applied through the sealed cabin while dynamic impact is applied through the Hopkinson pressure bar, enabling comprehensive testing under combined static and dynamic conditions with multi-field coupling.
Solution Approach 2:
The sealed cabin acts as an intermediary device that applies water pressure, gas pressure, and temperature loading to the sample while the dynamic and static loading devices apply mechanical loads. This intermediary structure enables the simultaneous application of all loading conditions without direct interference between the different loading mechanisms.
3Measurement precision
If conventional testing methods are used, then standard dynamic properties can be measured, but dynamic mechanical response under residual mining area conditions cannot be determined
Solution Approach 1:
The patent applies local quality by creating specific environmental conditions (water pressure, gas pressure, temperature) within the sealed cabin that simulate the actual residual mining area conditions. The sample is subjected to localized multi-field coupling effects that replicate the in-situ environment, enabling accurate measurement of dynamic mechanical properties under realistic conditions.
Solution Approach 2:
The testing system enables parameter changes by allowing independent adjustment of water pressure, gas pressure, temperature, static load, and dynamic impact load. This flexibility allows the system to simulate various residual mining area conditions and measure how dynamic mechanical properties change under different parameter combinations.
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 comprehensive testing of coal and rock samples under water-gas-temperature multi-field coupling, allowing for the accurate determination of dynamic mechanical properties and safe mining practices.
Implementation Method 1
a gas pressure loading device... The gas pressure loading device includes a high-pressure gas tank, a pressure regulating valve, a second barometer, a second high-pressure valve and a first three-way valve connected in sequence
Implementation Method 2
a water pressure loading device... The water pressure loading device includes an electric pressure test water pump, a water pressure gauge, an accumulator and a one-way valve connected in sequence
Implementation Method 3
a temperature loading device... The temperature loading device includes thermocouple heating rods, a temperature display and a thermocouple temperature control circuit board connected in sequence
Implementation Method 4
a dynamic and static combined loading device for a Hopkinson pressure bar... the impact loading device includes a high-pressure gas storage chamber, a bullet, a gun barrel and an incident rod
Implementation Method 5
the axial pressure loading device includes a transmission rod and an axial hydraulic cylinder, where static prestress load is applied to the transmission rod and a sample through an oil pressure in the axial hydraulic cylinder
Implementation Method 6
The sealed cabin body is a cylindrical hollow cavity; a left wall and a right wall of the sealed cabin body are provided with circular openings having an inner diameter of 50 mm, respectively; inner walls of the circular openings are provided with grooves respectively, for installing the Y-shaped and high-temperature resistant sealing rings
Data Source
AI summary
A loading system for a Hopkinson pressure bar test under water-gas-temperature multi-field coupling action includes: a sample sealed cabin which includes sealing flanges, Y-shaped and high-temperature resistant sealing rings, and a sealed cabin body; a gas pressure loading device which includes a high-pressure gas tank, a pressure regulating valve, a second barometer, a second high-pressure valve and a first three-way valve connected in sequence; a water pressure loading device which includes an electric pressure test water pump, a water pressure gauge, an accumulator and a one-way valve connected in sequence; a temperature loading device which includes thermocouple heating rods, a temperature display and a thermocouple temperature control circuit board connected in sequence; and a dynamic and static combined loading device which includes an axial pressure loading device, an impact loading device and a Hopkinson pressure bar member.