Micro-Nano Impact Indentation With Cyclic Refrigeration
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Solution Overview
Problem
Existing impact indentation technologies struggle to accurately test material properties under high strain rates and low-temperature conditions due to temperature drift and the difficulty in integrating in-situ monitoring methods, leading to inaccurate results.
Innovation Solution
A micro-nano impact indentation testing device utilizing cyclic refrigeration with a refrigeration device, cold conduction wire, and phase change material to stabilize the temperature of the indenter and sample, combined with real-time temperature regulation and infrared thermal imaging for precise testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If atmosphere refrigeration with liquid nitrogen Dewar flask is used, then low-temperature cooling capability is improved, but device complexity and space requirement increase
Solution Approach 1:
The refrigeration system is segmented into multiple independent cooling channels: a first cooling channel for the indenter and a second cooling channel for the sample stage. Each channel has its own refrigerant circulation path, allowing independent temperature control of different components without requiring a single complex atmospheric refrigeration system.
Solution Approach 2:
A heat conduction wire serves as an intermediary thermal coupling element between the indenter and sample stage. This wire allows thermal energy transfer between the two components while enabling independent refrigeration of each, eliminating the need for direct thermal contact and complex integrated cooling structures.
2Measurement precision
If separate refrigeration for indenter and sample is implemented, then temperature control precision is improved, but device complexity increases
Solution Approach 1:
The heat conduction wire merges the thermal management functions of the indenter and sample stage into a unified thermal pathway. While separate refrigeration channels are used, the heat conduction wire integrates their thermal interaction, allowing coordinated temperature control with reduced overall system complexity.
3Device complexity
If traditional static or quasi-static indentation testing is used, then device simplicity is maintained, but strain rate capability deteriorates
Solution Approach 1:
The testing device incorporates dynamic loading capabilities through piezoelectric actuators that can apply rapid, high-strain-rate impacts to the indenter. This dynamic mechanism enables the system to achieve strain rates exceeding 10³ s⁻1 while maintaining a relatively simple overall device structure compared to complex dynamic testing systems.
4Measurement precision
If low-temperature impact indentation testing is implemented, then material property assessment accuracy is improved, but temperature drift occurs
Solution Approach 1:
Temperature sensors are positioned to monitor the indenter and sample stage temperatures in real-time. The control system uses this feedback information to dynamically adjust the refrigeration rate and intensity, preventing temperature drift and maintaining stable low-temperature conditions throughout the impact indentation testing process.
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 device achieves stable temperature control between the indenter and sample, eliminating temperature drift and enabling accurate observation of material properties under extreme conditions, supporting further development in energy, power, and aerospace fields.
Implementation Method 1
a refrigeration device, wherein the refrigeration device is connected to a pressure rod micro-channel embedded in the pressure rod through a pressure rod inlet cold pipe and a pressure rod outlet cold pipe to form a circulating pipeline, so that the refrigeration device can circulate a refrigerating medium in the pressure rod
Implementation Method 2
A micro-nano impact indentation testing device utilizing cyclic refrigeration with a refrigeration device, cold conduction wire, and phase change material to stabilize the temperature of the indenter and sample
Implementation Method 3
an infrared thermal imaging assembly, and an infrared thermal imaging range of the infrared thermal imaging assembly comprises the force sensor, the pressure rod, the to-be-tested sample and the stage
Implementation Method 4
the drive platform is further provided with a hinge base, the hinge base is provided with the piezoelectric stack and the pressure rod which are connected, a tip end of the pressure rod is provided with a diamond indenter, so that the pressure rod and the diamond indenter can move towards the stage under the push of the piezoelectric stack
Data Source
AI summary
The present invention provides a micro-nano impact indentation testing device and method based on cyclic refrigeration, and relates to the technical field of material property testing. The testing device comprises a pressure rod and a stage for low-temperature micro-nano impact indentation testing, and a refrigeration device for refrigerating and cooling the pressure rod and the stage, wherein the refrigeration device refrigerates the pressure rod and the stage by adopting an embedded channel, a cold conduction wire connected to the pressure rod and the stage and a refrigeration balancer in contact with the cold conduction wire are arranged between the pressure rod and the stage, and the temperature of the pressure rod and the temperature of the stage are stabilized at a common temperature point by the cold conduction wire and the refrigeration balancer together.