CN114018733B - High-temperature fatigue crack propagation test method and device based on flexibility principle - Google Patents

High-temperature fatigue crack propagation test method and device based on flexibility principle Download PDF

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Publication number
CN114018733B
CN114018733B CN202111327420.7A CN202111327420A CN114018733B CN 114018733 B CN114018733 B CN 114018733B CN 202111327420 A CN202111327420 A CN 202111327420A CN 114018733 B CN114018733 B CN 114018733B
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sample
clamp
test
fatigue
load
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CN114018733A (en
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罗娟
罗家成
包陈
李朋洲
孙磊
唐鹏
姚迪
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Nuclear Power Institute of China
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Nuclear Power Institute of China
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G01N3/04—Chucks
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058—Kind of property studied
    • G01N2203/006—Crack, flaws, fracture or rupture
    • G01N2203/0062—Crack or flaws
    • G01N2203/0066—Propagation of crack
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/022—Environment of the test
    • G01N2203/0222—Temperature
    • G01N2203/0226—High temperature; Heating means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/06—Indicating or recording means; Sensing means
    • G01N2203/067—Parameter measured for estimating the property
    • G01N2203/0682—Spatial dimension, e.g. length, area, angle

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The embodiment of the invention provides a high-temperature fatigue crack growth test method and a device based on a flexibility principle, which are used for realizing a high-temperature fatigue crack growth rate measurement test of a metal material and comprise the following steps: the clamping end of the first clamp is connected with one end of the sliding arm; a sliding arm, the other end of which is provided with a sliding block; the second clamp is provided with a sliding rail which is used for being in sliding connection with the sliding block, and the clamping end of the second clamp is used for clamping the sample by matching with the clamping end of the first clamp; the extension column is arranged at one end far away from the clamping end of the second clamp and is close to the sliding rail; and the COD extensometer is connected with the other end of the sliding arm and the extension column through the mounting part respectively so as to realize the extension measurement of the sample loading linear displacement. The embodiment of the invention eliminates the influence of transverse vibration on the measurement precision of the sample loading linear displacement; by adopting the device to detect the test sample after the calibration sample is calibrated, the fatigue crack growth rate of the test sample is measured.

Description

High-temperature fatigue crack propagation test method and device based on flexibility principle
Technical Field
The invention relates to a high-temperature fatigue crack propagation test method and device based on a flexibility principle.
Background
Fatigue crack propagation performance is an important index for measuring the fracture performance of materials and structural members, and plays a vital role in evaluating the structural integrity of engineering members. For structural members containing I-type open cracks, the traditional method for obtaining the fatigue crack propagation performance of the structural members is to test the structural members by adopting a compact tensile sample through a tensile fatigue loading mode. The fatigue crack growth test under the high-temperature environment can realize the real-time crack length measurement of the sample by a visual inspection method, a compliance method or a potential method. The visual inspection method needs to use a special microscopic measuring instrument to be matched with a special high-temperature furnace, the manufacturing cost is relatively high, and the measuring precision is easily influenced by high-temperature atmosphere. The potential method has clear testing principle and simple operation, but the testing precision under fatigue loading is greatly influenced by high-temperature environment. Under the condition of lacking a high-temperature COD extensometer, no effective fatigue crack growth performance detection technology based on a compliance method exists at present.
Disclosure of Invention
The embodiment of the invention provides a high-temperature fatigue crack growth test method and device based on a flexibility principle, so as to realize a high-temperature fatigue crack growth rate measurement test of a metal material.
The embodiment of the invention is realized by the following technical scheme:
In a first aspect, an embodiment of the present invention provides a high temperature fatigue crack growth test apparatus based on a compliance principle, including:
The clamping end of the first clamp is connected with one end of the sliding arm;
A sliding arm, the other end of which is provided with a sliding block;
the second clamp is provided with a sliding rail which is used for being in sliding connection with the sliding block, and the clamping end of the second clamp is used for clamping the sample by matching with the clamping end of the first clamp;
The extension column is arranged at one end far away from the clamping end of the second clamp and is close to the sliding rail; and
The COD extensometer is connected with the other end of the sliding arm and the extension column through the mounting part respectively so as to realize the extension measurement of the sample loading linear displacement.
Further, the clamping end of the first clamp and the clamping end of the second clamp are provided with U-shaped openings; the U-shaped opening is provided with a fixing hole for fixing a sample.
Further, the sliding arm is a straight arm extending along the length direction of the first clamp, and the sliding rail is a linear guide rail extending along the length direction of the second clamp.
Further, the COD extensometer is a room temperature COD extensometer.
Further, the mounting part is a movable standard knife edge.
Further, the test specimen is fixed to the first jig and the second jig through the fixing hole by the loading pin.
In a second aspect, an embodiment of the present invention provides a method for testing propagation of fatigue cracks at high temperature based on a compliance principle, including:
connecting the test device with a testing machine;
Fixing the sample through a first clamp and a second clamp;
placing the sample in a high temperature furnace, and placing a COD extensometer outside the high temperature furnace;
The test specimen was heated to the test temperature and incubated.
Further, the method further comprises the following steps:
And (5) flexibility calibration:
the sample adopts a calibration sample;
applying a fatigue load spectrum block containing two-stage fatigue load to the calibration sample until the sample is unstable and damaged to obtain a load P, a cycle number and a loading linear displacement LLD;
Measuring the real-time crack length a sketched by the second-stage fatigue load under different cycle times from the section of the sample after the instability and damage of the calibration sample;
using load P, cycle number, load linear displacement LLD and real-time crack length a according to the formula
（1）
C=LLD/P (2)
Yielding d 1 and d 2; wherein W is the sample width, B is the sample thickness, E is the material elastic modulus, C is the sample compliance, and U X is an intermediate variable.
Further, in the two-stage fatigue load, the first-stage fatigue load is a test load, and the cycle is 20000 times; the second stage fatigue load is 50% -70% of the first stage fatigue load, and the cycle is 5000 times.
Further, the method further comprises the following steps:
Fatigue crack growth rate test:
The test sample is adopted as the sample;
applying a fatigue load spectrum block containing two-stage fatigue load to the test sample until the sample is unstable and damaged to obtain a load P, a cycle number and a loading linear displacement LLD;
after the instability and destruction of the calibration sample, adopting d 1 and d 2 obtained by the calculation of compliance calibration according to the formula
（1）
C=LLD/P （2）
And calculating to obtain the real-time crack length a, and further calculating to obtain the fatigue crack expansion rate.
Compared with the prior art, the embodiment of the invention has the following advantages and beneficial effects:
According to the high-temperature fatigue crack propagation test method and device based on the flexibility principle, the test sample is fixed through the first clamp and the second clamp, and the sliding connection of the sliding block on the sliding arm and the sliding rail prevents the sliding arm from transversely vibrating in the fatigue loading process, so that the influence of the transverse vibration on the test sample loading linear displacement measurement accuracy is eliminated; the COD extensometer is simultaneously arranged on the sliding arm and the extending column, so that when the sliding arm slides reciprocally in a gap between the sliding rail and the extending column, the tester can carry out extension measurement on the loading linear displacement of the sample through the COD extensometer; and by adopting the device to detect the test sample after the calibration sample is calibrated, the fatigue crack growth rate of the test sample is measured.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are needed in the examples will be briefly described below, it being understood that the following drawings only illustrate some examples of the present invention and therefore should not be considered as limiting the scope, and that other related drawings may be obtained from these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of the structure of an upper extension arm;
FIG. 2 is a schematic view of an extension column;
Fig. 3 is a schematic structural view of the upper U-shaped clamp.
Fig. 4 is a high temperature fatigue crack growth test apparatus based on the compliance principle.
FIG. 5 is a plot of the high temperature fatigue crack growth rate test sites for a sample of material. Wherein, the figure (a) is a high-temperature fatigue crack propagation test device diagram before the installation of the high-temperature furnace; FIG. (b) is a drawing of a high-temperature fatigue crack growth test apparatus after the high-temperature furnace is installed.
In the drawings, the reference numerals and corresponding part names:
The device comprises a 1-upper extension arm, a 2-mounting part, a 3-extension column, a 4-upper U-shaped clamp, a 5-upper U-shaped opening, a 6-sample, a 7-lower U-shaped clamp, an 8-sliding block and a 9-lower U-shaped opening.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: no such specific details are necessary to practice the invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail in order not to obscure the invention.
Throughout the specification, references to "one embodiment," "an embodiment," "one example," or "an example" mean: a particular feature, structure, or characteristic described in connection with the embodiment or example is included within at least one embodiment of the invention. Thus, the appearances of the phrases "in one embodiment," "in an example," or "in an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Moreover, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and that the illustrations are not necessarily drawn to scale. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the scope of the present invention.
Examples
Referring to fig. 1-5, the embodiment of the invention provides a high-temperature fatigue crack growth test method and device based on a flexibility principle, so as to realize a high-temperature fatigue crack growth rate measurement test of a metal material. In a first aspect, an embodiment of the present invention provides a high temperature fatigue crack growth test apparatus based on a compliance principle, including: the clamping end of the first clamp is connected with one end of the sliding arm; a sliding arm, the other end of which is provided with a sliding block; the second clamp is provided with a sliding rail which is used for being in sliding connection with the sliding block, and the clamping end of the second clamp is used for clamping the sample by matching with the clamping end of the first clamp; the extension column is arranged at one end far away from the clamping end of the second clamp and is close to the sliding rail; and the COD extensometer is connected with the other end of the sliding arm and the extension column through the mounting part respectively so as to realize the extension measurement of the sample loading linear displacement.
Therefore, according to the embodiment of the invention, the sample is fixed through the first clamp and the second clamp, and the sliding connection of the sliding block on the sliding arm and the sliding rail prevents the sliding arm from transversely vibrating in the fatigue loading process, so that the influence of the transverse vibration on the measurement precision of the linear displacement of the sample loading is eliminated; the COD extensometer is simultaneously arranged on the sliding arm and the extending column, so that when the sliding arm slides reciprocally in a gap between the sliding rail and the extending column, the tester can carry out extension measurement on the loading linear displacement of the sample through the COD extensometer; and by adopting the device to detect the test sample after the calibration sample is calibrated, the fatigue crack growth rate of the test sample is measured.
Further, the clamping end of the first clamp and the clamping end of the second clamp are provided with U-shaped openings; the U-shaped opening is provided with a fixing hole for fixing a sample.
Referring to FIGS. 1-4, the test device includes a first fixture and a second fixture; the first clamp is an upper U-shaped clamp 4; the second clamp is a lower U-shaped clamp 7; the lower end of the upper U-shaped clamp 4 is provided with an upper U-shaped opening 5; the upper end of the lower U-shaped clamp is provided with a lower U-shaped opening 9; an upper U-shaped opening 5 at the lower end of the upper U-shaped clamp 4 is connected with the upper end of the sliding arm; the upper U-shaped opening and the lower U-shaped opening are used for fixing a sample 6; the sliding arm is an upper extension arm 1; the lower end of the upper extension arm is connected with a sliding block 8; the position of the upper extension arm close to the lower end of the upper extension arm is provided with a mounting part 2; a slide rail is arranged on the lower U-shaped clamp 7; the sliding block 8 is in sliding connection with the sliding rail; optionally, the slide of the upper extension arm slides in the gap between the extension column 3 and the slide 8 via a sliding rail. One part of the COD extensometer is connected to the upper extension arm through the mounting part; the other part of the COD extensometer is connected to the extension column to realize the extension measurement of the sample loading linear displacement.
Optionally, the sliding arm is a straight arm extending along the length direction of the first clamp, and the sliding rail is a linear guide rail extending along the length direction of the second clamp.
The guide rail part of the linear guide rail is arranged on the lower U-shaped clamp 7, and the slide block part of the linear guide rail is fixed with the upper extension arm 1 to prevent the transverse vibration of the upper extension arm 1 in the fatigue loading process, so that the influence of the transverse vibration on the measurement accuracy of the sample loading linear displacement is eliminated. And movable standard knife edges are respectively arranged on the upper extension arm 1 and the extension column 3, and a COD extensometer is arranged on the knife edges to realize the extension measurement of the sample loading linear displacement.
Further, the COD extensometer is a room temperature COD extensometer. The device can realize the high-temperature fatigue crack growth rate measurement test of the metal material under the condition of lacking a special high-temperature COD extensometer. Because the high-temperature COD extensometer is high in cost, the technical scheme of the invention can greatly reduce the test cost on the premise of ensuring the test precision, and the test effect is ideal.
Further, the mounting part is a movable standard knife edge.
Further, the test specimen is fixed to the first jig and the second jig through the fixing hole by the loading pin.
In a second aspect, an embodiment of the present invention provides a method for testing propagation of fatigue cracks at high temperature based on a compliance principle, including:
Connecting the test device with a testing machine; fixing the sample through a first clamp and a second clamp; placing the sample in a high temperature furnace, and placing a COD extensometer outside the high temperature furnace; the test specimen was heated to the test temperature and incubated.
And (3) mounting a test device:
a) And placing a sample between the upper U-shaped clamp and the lower U-shaped clamp, and connecting by using a loading pin.
B) The lower U-shaped clamp is provided with a guide rail part of the linear guide rail, and a sliding block part of the linear guide rail is fixed with the upper extension arm 1.
C) And movable standard knife edges are respectively arranged on the upper extension arm and the extension column, and the room temperature COD extensometer is arranged on the knife edges.
D) The fixture system with the mounted sample was connected to the testing machine.
E) The high temperature furnace is installed at the corresponding position, so that the sample is positioned in the high temperature furnace, and the room temperature COD extensometer is positioned outside the high temperature furnace.
Further, the method further comprises the following steps:
And (5) flexibility calibration:
the sample adopts a calibration sample;
applying a fatigue load spectrum block containing two-stage fatigue load to the calibration sample until the sample is unstable and damaged to obtain a load P, a cycle number and a loading linear displacement LLD;
Measuring the real-time crack length a sketched by the second-stage fatigue load under different cycle times from the section of the sample after the instability and damage of the calibration sample;
using load P, cycle number, load linear displacement LLD and real-time crack length a according to the formula
（1）
C=LLD/P (2)
Yielding d 1 and d 2; wherein W is the sample width, B is the sample thickness, E is the material elastic modulus, C is the sample compliance, and U X is an intermediate variable.
Compliance calibration follows the following steps:
a) And installing a calibration sample according to the sample installation step.
B) And heating the calibration sample to a test temperature and preserving the temperature for a certain time.
C) After the temperature of the calibrated sample is constant, a fatigue load spectrum block containing two-stage fatigue loads is applied to the sample. The first-stage fatigue load is a test load, the cycle is 20000 times, the second-stage fatigue load is 50% -70% of the first-stage fatigue load, and the cycle is 5000 times. The second stage fatigue load is used to delineate the real-time crack length under the first stage fatigue load. And fatigue loading the calibration sample to instability and damage by the load spectrum block. And in the test process, recording information such as load P, cycle number, loading linear displacement LLD and the like.
D) After the CT sample is calibrated to be unstable and damaged, the sample is opened, and the real-time crack length outlined by the second-stage fatigue load under different cycle times is measured from the section of the sample.
E) The coefficients d 1 and d 2 of the linear relationship are determined from equation (1) using the acquired load, cycle number, LLD data and measured crack length.
Further, in the two-stage fatigue load, the first-stage fatigue load is a test load, and the cycle is 20000 times; the second stage fatigue load is 50% -70% of the first stage fatigue load, and the cycle is 5000 times.
Further, the method further comprises the following steps:
Fatigue crack growth rate test:
The test sample is adopted as the sample;
applying a fatigue load spectrum block containing two-stage fatigue load to the test sample until the sample is unstable and damaged to obtain a load P, a cycle number and a loading linear displacement LLD;
after the instability and destruction of the calibration sample, adopting d 1 and d 2 obtained by the calculation of compliance calibration according to the formula
（1）
C=LLD/P （2）
And calculating to obtain the real-time crack length a, and further calculating to obtain the fatigue crack expansion rate.
For the test specimens for fatigue crack growth rate test, the specimens were mounted as described above and heated to the test temperature, and then fatigue-loaded according to the standard compliance test procedure until the specimens were destroyed. And calculating the real-time crack length of the sample according to the calibration result, and further obtaining the fatigue crack growth rate result of the tested sample.
A test site for the high-temperature fatigue crack growth rate of a sample of a certain material is shown with reference to fig. 5.
Therefore, the embodiment of the invention can conveniently realize the high-temperature fatigue crack extension test of the metal material, and the device has simple structure, easy installation and strong operability.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.

Claims (9)

1. The utility model provides a high temperature fatigue crack growth test device based on compliance principle which characterized in that includes:
The clamping end of the first clamp is connected with one end of the sliding arm;
A sliding arm, the other end of which is provided with a sliding block;
the second clamp is provided with a sliding rail which is used for being in sliding connection with the sliding block, and the clamping end of the second clamp is used for clamping the sample by matching with the clamping end of the first clamp;
The extension column is arranged at one end far away from the clamping end of the second clamp and is close to the sliding rail; and
The COD extensometer is connected with the other end of the sliding arm and the extension column through the mounting part respectively so as to realize the extension measurement of the sample loading linear displacement;
The sliding arm is a straight arm extending along the length direction of the first clamp, and the sliding rail is a linear guide rail extending along the length direction of the second clamp.
2. The high temperature fatigue crack propagation test device based on the compliance principle as claimed in claim 1, wherein the clamping end of the first clamp and the clamping end of the second clamp are provided with U-shaped openings; the U-shaped opening is provided with a fixing hole for fixing a sample.
3. The high temperature fatigue crack propagation test device based on the compliance principle according to claim 1, wherein the COD extensometer is a room temperature COD extensometer.
4. The high temperature fatigue crack propagation testing device based on the compliance principle according to claim 1, wherein the mounting portion is a movable standard knife edge.
5. The high temperature fatigue crack growth testing device based on the compliance principle according to claim 1, wherein the test specimen is fixed to the first jig and the second jig through the fixing hole by the loading pin.
6. The high-temperature fatigue crack propagation test method based on the flexibility principle is characterized by comprising the following steps of:
Connecting the test device of any one of claims 1-5 to a testing machine;
Fixing the sample through a first clamp and a second clamp;
placing the sample in a high temperature furnace, and placing a COD extensometer outside the high temperature furnace;
The test specimen was heated to the test temperature and incubated.
7. The method for testing the propagation of fatigue cracks at high temperature based on the principle of compliance according to claim 6, further comprising:
And (5) flexibility calibration:
the sample adopts a calibration sample;
applying a fatigue load spectrum block containing two-stage fatigue load to the calibration sample until the sample is unstable and damaged to obtain a load P, a cycle number and a loading linear displacement LLD;
Measuring the real-time crack length a sketched by the second-stage fatigue load under different cycle times from the section of the sample after the instability and damage of the calibration sample;
using load P, cycle number, load linear displacement LLD and real-time crack length a according to the formula
（1）
C=LLD/P (2)
Yielding d 1 and d 2; wherein W is the sample width, B is the sample thickness, E is the material elastic modulus, C is the sample compliance, and U X is an intermediate variable.
8. The method for testing the propagation of the high-temperature fatigue crack based on the flexibility principle according to claim 7, wherein the first-stage fatigue load is a test load, and the cycle is 20000 times; the second stage fatigue load is 50% -70% of the first stage fatigue load, and the cycle is 5000 times.
9. The method for testing the propagation of fatigue cracks at high temperature based on the principle of compliance according to claim 7 or 8, further comprising:
Fatigue crack growth rate test:
The test sample is adopted as the sample;
applying a fatigue load spectrum block containing two-stage fatigue load to the test sample until the sample is unstable and damaged to obtain a load P, a cycle number and a loading linear displacement LLD;
after the instability and destruction of the calibration sample, adopting d 1 and d 2 obtained by the calculation of compliance calibration according to the formula
（1）
C=LLD/P （2）
And calculating to obtain the real-time crack length a, and further calculating to obtain the fatigue crack expansion rate.
CN202111327420.7A 2021-11-10 2021-11-10 High-temperature fatigue crack propagation test method and device based on flexibility principle Active CN114018733B (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4836029A (en) * 1988-03-25 1989-06-06 Lord Corporation Method and apparatus for measuring crack growth
DE4128214A1 (en) * 1990-08-27 1992-03-05 Toyoda Gosei Kk DEVICE AND METHOD FOR FATIGUE TESTS
CN103884603A (en) * 2014-04-02 2014-06-25 华东理工大学 Creep deformation-fatigue crack growth testing device and corresponding testing method
WO2014194816A1 (en) * 2013-06-07 2014-12-11 合肥通用机械研究院 Device for testing mixed-mode fatigue crack growth rate
CN109030248A (en) * 2018-07-10 2018-12-18 西南交通大学 I-II Mixed Mode Crack Fatigue Crack Growth Rates experimental rig and test method
CN110864985A (en) * 2019-11-22 2020-03-06 浙江工业大学 Extensometer alignment adjusting device for creep fatigue testing machine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4836029A (en) * 1988-03-25 1989-06-06 Lord Corporation Method and apparatus for measuring crack growth
DE4128214A1 (en) * 1990-08-27 1992-03-05 Toyoda Gosei Kk DEVICE AND METHOD FOR FATIGUE TESTS
WO2014194816A1 (en) * 2013-06-07 2014-12-11 合肥通用机械研究院 Device for testing mixed-mode fatigue crack growth rate
CN103884603A (en) * 2014-04-02 2014-06-25 华东理工大学 Creep deformation-fatigue crack growth testing device and corresponding testing method
CN109030248A (en) * 2018-07-10 2018-12-18 西南交通大学 I-II Mixed Mode Crack Fatigue Crack Growth Rates experimental rig and test method
CN110864985A (en) * 2019-11-22 2020-03-06 浙江工业大学 Extensometer alignment adjusting device for creep fatigue testing machine

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