JPH09281023A - U-shape bending fatigue tester - Google Patents
U-shape bending fatigue testerInfo
- Publication number
- JPH09281023A JPH09281023A JP9391396A JP9391396A JPH09281023A JP H09281023 A JPH09281023 A JP H09281023A JP 9391396 A JP9391396 A JP 9391396A JP 9391396 A JP9391396 A JP 9391396A JP H09281023 A JPH09281023 A JP H09281023A
- Authority
- JP
- Japan
- Prior art keywords
- test piece
- jigs
- rotary
- test
- bending fatigue
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、自動車排気系また
は建物内の排気系等のベローズに対して、振動によるベ
ローズの曲げ加工部分の疲労破壊現象、または板バネ等
に代表される板材の曲げ加工部の疲労破壊現象を再現す
るU字曲げ疲労試験機に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bellows of an automobile exhaust system or an exhaust system in a building, and a fatigue fracture phenomenon of a bent portion of the bellows due to vibration or bending of a plate material represented by a leaf spring. The present invention relates to a U-shaped bending fatigue testing machine that reproduces a fatigue fracture phenomenon of a processed part.
【0002】[0002]
【従来の技術】ベローズは自動車排気系、建物内の空調
の排気系に使用されており、部材はエンジン等の接続機
器から伝搬する振動、あるいは内部を通過するガス、液
体の流れによる振動を受ける。そのため、材料選択の際
にはこれらの振動による疲労破壊に配慮する必要があ
る。ベローズ構造体の場合、振動によりベローズの曲げ
加工部に応力が負荷される。したがって、材料選定には
曲げ疲労試験の実施が必要である。曲げ疲労試験として
は、JIS Z 2275の平板での曲げモーメントに
よる疲労試験方法があるが、現実の曲げ加工された部位
の疲労現象と平板での疲労試験とは正確に対応せず、材
料選定には曲げ試験片による疲労試験が望まれる。2. Description of the Related Art Bellows are used in automobile exhaust systems and exhaust systems for air conditioning in buildings. Members are subjected to vibrations propagating from connecting equipment such as an engine or vibrations of gas or liquid flowing through the inside. . Therefore, it is necessary to consider fatigue damage due to these vibrations when selecting materials. In the case of a bellows structure, stress is applied to the bent portion of the bellows due to vibration. Therefore, it is necessary to perform a bending fatigue test for material selection. As a bending fatigue test, there is a JIS Z 2275 fatigue test method using a bending moment on a flat plate, but the actual fatigue phenomenon of a bent part and the fatigue test on a flat plate do not correspond accurately, so the material selection A fatigue test using bending test pieces is desired.
【0003】[0003]
【発明が解決しようとする課題】曲げ加工部の疲労試験
としては、図3に示す様な上下の振動により、U字に曲
げた試験片1の曲げ加工部に応力を負荷させる試験方法
が考えられる。しかし、試験片が薄板である場合には、
試験片の水平部のたわみにより上下振動が緩和され、曲
げ加工部へ負荷される応力は減少する。そのため、曲げ
加工部へ負荷される応力を増加させるために上下振動の
振幅を増加する必要があるが、その場合曲げ加工部より
も試験片固定治具2の端部の試験片に応力が集中し、こ
の部分での破壊が曲げ加工部での破壊より先行する。更
に、曲げ試験片の出力応力は汎用疲労試験機に常設の歪
ゲージ(ロードセル)の検出限界以下であり、応力制御
の試験の実施は困難である。As a fatigue test of a bending part, a test method of applying stress to the bending part of the test piece 1 bent in U shape by vertical vibration as shown in FIG. 3 is considered. To be However, when the test piece is a thin plate,
The deflection of the horizontal part of the test piece reduces the vertical vibration and reduces the stress applied to the bent part. Therefore, it is necessary to increase the amplitude of vertical vibration in order to increase the stress applied to the bending portion, but in that case, the stress is concentrated on the test piece at the end of the test piece fixing jig 2 rather than the bending portion. However, the fracture at this portion precedes the fracture at the bending portion. Further, the output stress of the bending test piece is below the detection limit of the strain gauge (load cell) permanently installed in the general-purpose fatigue tester, and it is difficult to carry out the stress control test.
【0004】本発明は、U字曲げ部材の曲げ疲労による
破壊現象を高精度で再現することができるU字曲げ疲労
試験機を提供することを目的とする。It is an object of the present invention to provide a U-shaped bending fatigue testing machine capable of reproducing a fracture phenomenon of a U-shaped bending member due to bending fatigue with high accuracy.
【0005】[0005]
【課題を解決するための手段】本発明者等は、前述の課
題を解決する手段を鋭意検討した結果、図3中の上下部
治具3,4と試験片固定治具2との固定を解除すること
により、試験片固定治具端部の試験片に集中する応力が
緩和することを知見として、本発明をなすに至った。Means for Solving the Problems As a result of earnest studies on means for solving the above-mentioned problems, the present inventors found that the upper and lower jigs 3 and 4 in FIG. The present invention has been accomplished based on the knowledge that the stress concentrated on the test piece at the end of the test piece fixing jig is relieved by releasing it.
【0006】即ち、本発明のU字曲げ疲労試験機は、U
字曲げ疲労試験を行うに際し、U字曲げ試験片の両端部
を試験片固定治具でそれぞれ固定し、その一端を下部固
定治具に固定し、他端を上下振動可能な上部固定治具に
固定して、上部固定治具の一定の上下振幅で繰り返し荷
重を加える疲労試験機において、試験片固定治具と上部
下部固定治具との間に、回転軸を介して連結された試験
片固定治具を回動自在とする回転治具を備えたことを特
徴とするU字曲げ疲労試験機、またはさらに上部治具に
歪ゲージを装着したU字曲げ疲労試験機である。That is, the U-shaped bending fatigue tester of the present invention is U-shaped.
When performing a bending bending fatigue test, fix both ends of a U-shaped bending test piece with a test piece fixing jig, fix one end to a lower fixing jig, and the other end to an upper fixing jig that can vibrate vertically. In a fatigue testing machine that is fixed and applies repeated load with a constant vertical amplitude of the upper fixing jig, fixing the test piece connected via a rotating shaft between the test piece fixing jig and the upper and lower fixing jigs. A U-shaped bending fatigue testing machine, which is equipped with a rotating jig that allows the jig to rotate, or a U-shaped bending fatigue testing machine in which a strain gauge is further attached to an upper jig.
【0007】[0007]
【発明の実施の形態】次に、本発明の実施の形態につい
て、図面に基づき説明する。図1は、本発明のU字曲げ
疲労試験機において、試験片をセットした状態を示す。
試験片1を固定した試験片固定治具2は、それぞれ回転
軸5を介して回転治具6と連結されている。そして、回
転治具6は、それぞれ上部治具3と下部治具4とに固定
されている。このような構成とすることにより、上下振
動のときに上下の試験片固定治具2は、それぞれ回転軸
5を中心として自由に回転できる。その結果として、試
験片固定治具端部の試験片に集中する応力は回転治具の
回転により緩和され、試験片に負荷される応力は曲げ加
工部が主となり、正確なU字曲げ疲労試験を実施するこ
とができる。また、応力制御の疲労試験の場合、上部治
具3に歪ゲージ(ロードセル)7を装着する必要があ
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a state in which test pieces are set in the U-shaped bending fatigue tester of the present invention.
The test piece fixing jig 2 to which the test piece 1 is fixed is connected to the rotating jig 6 via the rotating shaft 5, respectively. The rotary jig 6 is fixed to the upper jig 3 and the lower jig 4, respectively. With such a configuration, the upper and lower test piece fixing jigs 2 can freely rotate about the rotating shaft 5 when vertically vibrating. As a result, the stress concentrated on the test piece at the end of the test piece fixing jig is relaxed by the rotation of the rotating jig, and the stress applied to the test piece is mainly in the bending part, and the accurate U-shaped bending fatigue test is performed. Can be carried out. Further, in the case of a stress control fatigue test, it is necessary to mount a strain gauge (load cell) 7 on the upper jig 3.
【0008】図2は、U字曲げ疲労試験機の構成図であ
る。試験機本体8は、制御装置9からの命令に従い動作
し、これに必要な荷重は油圧源10から提供される。ま
た、ロードセル7からの出力により、応力制御の疲労試
験の実施が可能となる。FIG. 2 is a block diagram of a U-shaped bending fatigue tester. The tester main body 8 operates according to a command from the control device 9, and the load necessary for this is provided from the hydraulic power source 10. Further, the output from the load cell 7 makes it possible to carry out a stress control fatigue test.
【0009】[0009]
【実施例】板厚0.8mmのステンレス鋼SUS304を
用いて、半径20mmの円弧でかつ幅10mmのU字曲げ疲
労試験片を作製した。まず、これを用いて回転治具のな
い場合の疲労試験を実施したところ、試験片固定治具端
部の試験片に亀裂が発生し、破壊に至った。一方、本発
明の様に回転治具を装着して疲労試験を実施したとこ
ろ、曲げ加工部で破壊が発生し、上下振動の振幅と破断
までの回数との関係は、従来より知られる疲労破壊の傾
向を示した。したがって、本発明により曲げ加工部疲労
破壊現象を精度良く再現できた。Example A U-shaped bending fatigue test piece having a circular arc with a radius of 20 mm and a width of 10 mm was prepared using stainless steel SUS304 having a plate thickness of 0.8 mm. First, a fatigue test was carried out using this without a rotating jig. As a result, a crack was generated in the test piece at the end of the test piece fixing jig, resulting in destruction. On the other hand, when a fatigue test was carried out by mounting a rotating jig as in the present invention, a fracture occurred at the bending part, and the relationship between the amplitude of vertical vibration and the number of times until fracture was Showed a tendency. Therefore, according to the present invention, it is possible to accurately reproduce the fatigue fracture phenomenon of the bent portion.
【0010】[0010]
【発明の効果】以上説明したように、本発明のU字曲げ
疲労試験機を用いることにより、従来の疲労試験機では
不可能であった、曲げ加工部の疲労破壊現象を精度良く
再現することが可能となる。As described above, by using the U-shaped bending fatigue testing machine of the present invention, it is possible to accurately reproduce the fatigue fracture phenomenon of the bent portion, which was impossible with the conventional fatigue testing machine. Is possible.
【図1】本発明のU字曲げ疲労試験機において、治具を
装着した模擬図。FIG. 1 is a simulated view in which a jig is mounted in a U-shaped bending fatigue tester of the present invention.
【図2】本発明のU字曲げ疲労試験機で応力制御する際
の系統図。FIG. 2 is a system diagram when stress control is performed by the U-shaped bending fatigue tester of the present invention.
【図3】従来のU字曲げ疲労試験機の模式図。FIG. 3 is a schematic view of a conventional U-shaped bending fatigue tester.
1 曲げ試験片 2 試験片固定治具 3 上部治具 4 下部治具 5 回転軸 6 回転治具 7 ロードセル 8 試験機本体 9 制御装置 10 油圧源 1 Bending test piece 2 Test piece fixing jig 3 Upper jig 4 Lower jig 5 Rotating shaft 6 Rotating jig 7 Load cell 8 Testing machine body 9 Controller 10 Hydraulic power source
Claims (2)
げ試験片の両端部を試験片固定治具でそれぞれ固定し、
その一端を下部固定治具に固定し、他端を上下振動可能
な上部固定治具に固定して、上部固定治具の一定の上下
振幅で繰り返し荷重を加える疲労試験機において、試験
片固定治具と上部・下部固定治具との間に、回転軸を介
して連結された試験片固定治具を回動自在とする回転治
具を備えたことを特徴とするU字曲げ疲労試験機。1. When performing a U-shaped bending fatigue test, both ends of the U-shaped bending test piece are fixed by a test piece fixing jig,
One end is fixed to the lower fixing jig, and the other end is fixed to the upper fixing jig that can vibrate vertically. A U-shaped bending fatigue testing machine comprising a rotating jig that allows a test piece fixing jig connected via a rotating shaft to rotate, between the tool and the upper and lower fixing jigs.
項1記載のU字曲げ疲労試験機。2. The U-shaped bending fatigue tester according to claim 1, wherein a strain gauge is attached to the upper jig.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9391396A JPH09281023A (en) | 1996-04-16 | 1996-04-16 | U-shape bending fatigue tester |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9391396A JPH09281023A (en) | 1996-04-16 | 1996-04-16 | U-shape bending fatigue tester |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH09281023A true JPH09281023A (en) | 1997-10-31 |
Family
ID=14095720
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9391396A Withdrawn JPH09281023A (en) | 1996-04-16 | 1996-04-16 | U-shape bending fatigue tester |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH09281023A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006105735A (en) * | 2004-10-04 | 2006-04-20 | Yokohama Rubber Co Ltd:The | Fatigue tester |
JP2016540991A (en) * | 2013-12-18 | 2016-12-28 | クンシャン ニュー フラット パネル ディスプレイ テクノロジー センター カンパニー リミテッド | Bending test method and bending test system for flexible screen |
KR101723442B1 (en) | 2015-12-23 | 2017-04-05 | 주식회사 포스코 | Fatigue testing apparatus |
KR101996348B1 (en) * | 2019-01-10 | 2019-10-01 | 서울과학기술대학교 산학협력단 | Jig for U-shape folding fatigue test of flexible devices |
CN112798430A (en) * | 2021-02-09 | 2021-05-14 | 上海核工程研究设计院有限公司 | Clamp for U-shaped pipeline high-temperature high-pressure water environment test |
-
1996
- 1996-04-16 JP JP9391396A patent/JPH09281023A/en not_active Withdrawn
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006105735A (en) * | 2004-10-04 | 2006-04-20 | Yokohama Rubber Co Ltd:The | Fatigue tester |
JP2016540991A (en) * | 2013-12-18 | 2016-12-28 | クンシャン ニュー フラット パネル ディスプレイ テクノロジー センター カンパニー リミテッド | Bending test method and bending test system for flexible screen |
US10054527B2 (en) | 2013-12-18 | 2018-08-21 | Kunshan New Flat Panel Display Technology Center Co., Ltd. | Method and system for bending test of flexible screen |
KR101723442B1 (en) | 2015-12-23 | 2017-04-05 | 주식회사 포스코 | Fatigue testing apparatus |
KR101996348B1 (en) * | 2019-01-10 | 2019-10-01 | 서울과학기술대학교 산학협력단 | Jig for U-shape folding fatigue test of flexible devices |
CN112798430A (en) * | 2021-02-09 | 2021-05-14 | 上海核工程研究设计院有限公司 | Clamp for U-shaped pipeline high-temperature high-pressure water environment test |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6813960B1 (en) | Asymmetrical column assembly for high-cycle fatigue test machines | |
EP2589947B1 (en) | High frequency vibration system | |
JP2013501212A (en) | Test bench including a device for calibrating a force measuring device | |
US4802365A (en) | Multi-axial fatigue testing machine | |
CN112432753A (en) | Beam structure vibration fatigue device | |
JPH11142296A (en) | Inspecting apparatus for attenuation member of moving blade | |
Saadatzi et al. | AEVE 3D: Acousto electrodynamic three-dimensional vibration exciter for engineering testing | |
JPH09281023A (en) | U-shape bending fatigue tester | |
US6389900B1 (en) | Flexure assembly | |
JPH02502216A (en) | Method and apparatus for testing vehicle stabilizers | |
JPH07113721A (en) | Vibration testing device, vibration testing method, and vibration testing jig for structure | |
Carrie et al. | Modal testing of a rotating wind turbine | |
JP2007003425A (en) | Linear servo motor type oscillator | |
JPH02502848A (en) | Method and apparatus for testing elastic members having substantially linear spring deformability | |
Wong et al. | Vibration analysis of annular plates using mode subtraction method | |
CN115962904A (en) | Vibration reduction performance experiment system of dynamic vibration absorber of blade disc | |
CN113358281A (en) | Dynamic balance correction method for centrifugal fan impeller | |
JP2002195924A (en) | Method and device for multi-axial fatigue test | |
SU1587402A1 (en) | Method of fatigue testing of structure elements | |
GB2440557A (en) | Testing an article using vibration and gravitational forces | |
Sędek | Vibration Treatment–effective method of improving the dimensional stability of welded structures: investigation and practice | |
CN213456041U (en) | Beam structure vibration fatigue device | |
JP2007279041A (en) | Apparatus and process for checking play in vehicle connection | |
JPH02304331A (en) | Dynamic torsion characteristic testing machine | |
WO2023199489A1 (en) | Vibration generator fixing apparatus and vibration generation system |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20030701 |