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Device and method for testing superelasticity of shape memory alloy wire

A memory alloy wire and superelasticity technology, which is applied in the field of material performance testing, can solve the problems that the data is not intuitive, it is difficult to give a single quantified value of superelasticity, and the operation is complicated, so as to achieve controllable operation process, simple and fast installation and operation, Highly reproducible effect

Pending Publication Date: 2022-04-19
NAT INST OF ADVANCED MEDICAL DEVICES SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obtain various mechanical parameters under the unidirectional tensile stress state, such as elastic modulus, loading platform stress, unloading platform stress, residual strain and other parameters, to provide reference for the design of nickel-titanium shape memory alloy in practical applications, but this method is complicated to operate , the data is not intuitive enough
Not only special fixtures are required, but hyperelasticity needs to be obtained through comprehensive judgment of multiple parameters in the tensile curve, such as upper stress platform, lower stress platform, and maximum recoverable deformation. It is difficult to give a single quantitative value of hyperelasticity

Method used

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  • Device and method for testing superelasticity of shape memory alloy wire
  • Device and method for testing superelasticity of shape memory alloy wire
  • Device and method for testing superelasticity of shape memory alloy wire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Connect gas and electricity, take a nickel-titanium alloy wire with a bending degree of 1mm / m and a diameter of 0.2mm, with a length of 200mm, pass through the first cylindrical support 400 with a diameter of 15mm, and the distance from the axis of the first cylindrical support 400 to the limit block 201 100mm, the bottom end of the sample (nickel-titanium alloy wire) is flush with the bottom end of the fixed groove 500, and is fixed in the fixed groove 500 by pushing the fixed push rod assembly, and the initial scale corresponding to the scale 100 is recorded; press the control switch 300 to the pneumatic After the push rod reaches the limit block 201 and stays for 1s, release the control switch 300, repeat three times, record the scale difference before and after the scale comparison, start timing after the wire installation is completed, and end the timing when three repeated readings are completed; repeat the same batch of wire for testing 5 times, the final scale di...

Embodiment 2

[0051] Embodiment 2: Connect gas and electricity, take a nickel-titanium alloy wire with a curvature of 3mm / m and an outer diameter of 7mm, with a length of 300mm, pass through the first cylindrical support 400 with a diameter of 105mm, and the axis of the first cylindrical support 400 reaches the limit The distance between the positioning block 201 is 150mm, and the bottom end is flush with the bottom end of the fixing groove 500. Fix it in the fixing groove 500 by pushing the fixing push rod assembly, and record the initial scale; press the control switch 300 until the pneumatic push rod reaches the limit block 201 After staying for 1s, release the switch, repeat three times, record the scale difference before and after the scale comparison, start timing after the wire installation is completed, and end the timing when three repeated readings are completed; repeat the test with the same batch of wire materials for 5 times, and the scale difference is 0.05mm respectively , 0.0...

Embodiment 3

[0052] Embodiment 3: Connect gas and electricity, take a nickel-titanium alloy tube with a curvature of 3mm / m and an outer diameter of 7mm, with a length of 300mm, pass through the first cylindrical support 400 with a diameter of 105mm, and the axis of the first cylindrical support 400 to the right The limit distance is 150mm, and the bottom end is flush with the bottom end of the fixing groove 500. Fix it in the fixing groove 500 by pushing the fixing push rod assembly, and record the initial scale; press the switch until the pneumatic push rod reaches the limit block 201 and stay for 1 second Release the switch, repeat three times, record the scale difference before and after the scale comparison, start timing after the installation of the wire is completed, and end the timing when the three repeated readings are completed; repeat the same batch of wire for the test 5 times, the scale difference is 0.25mm, 0.25mm respectively , 0.25mm, 0.25mm, 0.25mm, the timing results of a ...

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Abstract

The invention belongs to the field of material performance testing, and relates to a device and a method for testing superelasticity of a shape memory alloy wire. The device comprises a platform, a clamping assembly, a bending assembly and a measuring assembly are arranged on the platform, the clamping assembly comprises a first base, a fixed groove and a fixed push rod assembly, the fixed push rod assembly is arranged on the first base, the fixed groove is used for placing a sample, and the fixed push rod assembly is used for clamping the sample in the fixed groove; the measuring assembly and the clamping assembly are oppositely arranged, and the measuring assembly comprises a ruler; the bending assembly is arranged between the clamping assembly and the measuring assembly and comprises a second base, a power push rod, a second cylindrical support, a first cylindrical support and a limiting block. According to the device, the sample is pushed by the push rod to be bent at the same position by the same angle, the hyperelasticity is quantitatively judged according to the shape recovery condition of the sample after repetition, the test precision can reach 0.05 mm, and the repeatability is high.

Description

technical field [0001] The invention belongs to the field of material performance testing, and relates to a device and a testing method for testing the superelasticity of a shape memory alloy wire. Background technique [0002] Nickel-titanium alloy has shape memory effect and superelasticity, and has been widely used in medical devices at home and abroad, especially in the field of implant interventional devices, such as cardiac stents and left atrial appendage occluders. At present, the performance system for device raw materials has been gradually improved, but the corresponding hyperelasticity test method still has problems such as time-consuming, poor repeatability, and difficulty in quantification. [0003] At present, the hyperelasticity test mainly adopts the method of stretching, and the hyperelasticity test of the material is realized by loading and unloading the material with different stresses. The specific process of the tensile test is: adjust the tensile equi...

Claims

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Application Information

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IPC IPC(8): F03G7/06G01N33/20
CPCG01N33/20
Inventor 于金营蒋鹏程胡楠
Owner NAT INST OF ADVANCED MEDICAL DEVICES SHENZHEN
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