JPH055659A - Evaluation of strength of flange joint - Google Patents
Evaluation of strength of flange jointInfo
- Publication number
- JPH055659A JPH055659A JP15721791A JP15721791A JPH055659A JP H055659 A JPH055659 A JP H055659A JP 15721791 A JP15721791 A JP 15721791A JP 15721791 A JP15721791 A JP 15721791A JP H055659 A JPH055659 A JP H055659A
- Authority
- JP
- Japan
- Prior art keywords
- bolt
- calculated
- clamping
- stress
- relative displacement
- 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.)
- Pending
Links
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、フランジ継手の強度評
価方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flange joint strength evaluation method.
【０００２】[0002]
【従来の技術】従来、フランジ継手の強度はＪＩＳ，Ｂ
−８２４３付属書２に基づいて計算されている。これは
主として管路軸心方向に作用する力に対しての強度を計
算するものであった。2. Description of the Related Art Conventionally, the strength of a flange joint is JIS, B
-8243 Calculated based on Annex 2. This was mainly to calculate the strength against the force acting in the axial direction of the pipeline.
【０００３】[0003]
【発明が解決しようとする課題】しかし、上記した従来
の方法では、下記の問題点があった。 １．管路に作用する外力に対する考慮が不十分である。However, the above-mentioned conventional method has the following problems. 1. Insufficient consideration is given to the external force acting on the pipeline.
【０００４】２．ボルト穴によるフランジの剛性低下に
対する考慮が不十分である。 ３．リブ付などのように形状が複雑な場合に対する考慮
が不十分である。 ４．フランジとハブ部との間に形成されたＲ部に対する
応力集中の評価が不十分である。2. Insufficient consideration is given to the reduction in flange rigidity due to bolt holes. 3. Insufficient consideration is given to cases where the shape is complicated, such as with ribs. 4. The stress concentration on the R portion formed between the flange and the hub portion is insufficiently evaluated.
【０００５】５．締結後、内圧および外力が載荷された
場合に、ボルトに発生する応力およびシール性の定量的
評価が不可能である。 本発明は上記課題を解決するもので、有限要素法を用い
た解析によりボルトに発生する応力およびシール性を定
量的に評価することができるフランジ継手の強度評価方
法を提供することを目的とする。5. After fastening, it is impossible to quantitatively evaluate the stress generated in the bolt and the sealing property when the internal pressure and the external force are applied. The present invention solves the above problems, and an object of the present invention is to provide a flange joint strength evaluation method capable of quantitatively evaluating stress and sealability generated in a bolt by analysis using a finite element method. ..
【０００６】[0006]
【課題を解決するための手段】上記課題を解決するため
に、本発明のフランジ継手の強度評価方法は、フランジ
に間にシール部材を介装し、フランジとシール部材の間
に接触要素を挿入し、フランジをボルトで相互に締結す
るフランジ継手において、予めボルトを二分割したモデ
ルを想定し、分割されたモデルの両端に適当な締付力を
載荷したときの軸方向におけるボルトの前記両端の変位
をｕｙ01，ｕｙ02として算出し、前記フランジ継手の耐
圧状態における前記ボルトの両端における変位をｕ
ｙ1，ｕｙ2 として、 ｕｙ01−ｕｙ02＝ｕｙ1 −ｕｙ2 ＝δｙ（締結力と等価
な相対変位） を満たす拘束条件の下に有限要素法による数値解析によ
ってボルトに発生する応力および接触要素に発生する応
力を算出し、算出した応力に基づいてボルト強度および
シール性を評価する構成としたものである。In order to solve the above problems, a method for evaluating the strength of a flange joint according to the present invention is such that a seal member is interposed between the flanges and a contact element is inserted between the flange and the seal member. However, in the case of a flange joint in which flanges are fastened to each other with bolts, assuming a model in which the bolts are divided into two parts in advance, and when appropriate tightening force is applied to both ends of the divided model, The displacement is calculated as uy 01 and uy 02 , and the displacement at both ends of the bolt in the pressure resistant state of the flange joint is u
As y 1 and uy 2 , stress and contact generated in the bolt by numerical analysis by the finite element method under the constraint condition of satisfying uy 01 −uy 02 = uy 1 −uy 2 = δy (relative displacement equivalent to the fastening force). The stress generated in the element is calculated, and the bolt strength and the sealability are evaluated based on the calculated stress.
【０００７】[0007]
【作用】上記構成により、ｕｙ01−ｕｙ02＝ｕｙ1−ｕ
ｙ2 となる拘束条件を与えることにより、初期締付状態
がモデル化される。このため、締付力が二分割されたボ
ルトの両端における相対変位に等価置換されるので、耐
圧状態においてボルトに発生する応力を定量的に評価す
ることができる。また、シール性についても接触要素に
発生する節点力あるいは応力から定量的に評価すること
ができる。With the above structure, uy 01 -uy 02 = uy 1 -u
The initial tightened state is modeled by giving a constraint condition of y 2 . Therefore, the tightening force is equivalently replaced by the relative displacement at both ends of the bolt divided into two parts, so that the stress generated in the bolt in the pressure resistant state can be quantitatively evaluated. Further, the sealing property can be quantitatively evaluated from the nodal force or stress generated in the contact element.
【０００８】[0008]
【実施例】以下、本発明の一実施例を図１に基づいて説
明する。図１において、フランジ１，２の間にはシール
部材３が介装されており、各フランジ１，２とシール部
材３との間にはギャップ要素やフィルムエレメント等の
接触要素４が挿入されている。また、フランジ１，２の
ボルト孔５に挿通して締結ボルト６が配置されており、
締結ボルト６の一端にはナット７が螺合している。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In FIG. 1, a seal member 3 is interposed between the flanges 1 and 2, and a contact element 4 such as a gap element or a film element is inserted between the flanges 1 and 2 and the seal member 3. There is. Further, the fastening bolts 6 are arranged by being inserted into the bolt holes 5 of the flanges 1 and 2,
A nut 7 is screwed onto one end of the fastening bolt 6.
【０００９】そして、上記構成のフランジ１，２、シー
ル部材３、締結ボルト６、ナット７を軸対象あるいは三
次元ソリッド要素でモデル化するとともに、締結ボルト
６をに二分割してモデル化し、有限要素法による数値解
析を行う。Then, the flanges 1 and 2, the seal member 3, the fastening bolts 6 and the nuts 7 having the above-mentioned constitutions are modeled as an axial object or a three-dimensional solid element, and the fastening bolts 6 are divided into two and modeled. Perform numerical analysis by the element method.
【００１０】はじめに、ボルト締め付け時において適当
な締付力Ｆを分割されたモデル化された締結ボルト６の
両端６ａ，６ｂに載荷し、軸方向における締結ボルト６
の各両端６ａ，６ｂの変位をｕｙ01，ｕｙ02として算出
する。First, at the time of tightening the bolt, an appropriate tightening force F is applied to both ends 6a and 6b of the divided modeled fastening bolt 6, and the fastening bolt 6 in the axial direction is loaded.
The displacements of both ends 6a and 6b of the above are calculated as uy 01 and uy 02 .
【００１１】次に、耐圧試験圧力負荷時における締結ボ
ルト６の両端における変位をｕｙ1，ｕｙ2 として、 ｕｙ01−ｕｙ02＝ｕｙ1 −ｕｙ2 ＝δｙ（締結力と等価
な相対変位） となる拘束条件を与えることにより、初期締付状態をモ
デル化して締付力Ｆを二分割された締結ボルト６の両端
６ａ，６ｂにおける相対変位に等価置換する。Next, let uy 1 and uy 2 be the displacements at both ends of the fastening bolt 6 when the pressure resistance test pressure is applied, and let uy 01 −uy 02 = uy 1 −uy 2 = δy (relative displacement equivalent to the fastening force). By applying the following constraint condition, the initial tightened state is modeled and the tightening force F is equivalently replaced by the relative displacement at both ends 6a and 6b of the tightened bolt 6 divided into two parts.
【００１２】さらに、前記の拘束条件の下に有限要素法
による数値解析によって締結ボルト６に発生する応力、
および接触要素４の要素面に想定した節点に発生する節
点力あるいは応力を算出る。Further, under the above constraint conditions, the stress generated in the fastening bolt 6 by the numerical analysis by the finite element method,
And the nodal force or stress generated at the nodal point assumed on the element surface of the contact element 4.
【００１３】そして、算出した締結ボルト６における応
力を締結ボルト６の降伏応力と比較し、締結ボルト６の
強度を評価する。したがって、耐圧状態において締結ボ
ルト６に発生する応力を定量的に評価することができ
る。Then, the calculated stress in the fastening bolt 6 is compared with the yield stress of the fastening bolt 6 to evaluate the strength of the fastening bolt 6. Therefore, the stress generated in the fastening bolt 6 in the pressure resistant state can be quantitatively evaluated.
【００１４】また、算出した接触要素４における応力か
ら接触要素４に作用する拘束反力の総和を算出し、この
拘束反力と内圧との比較によってシール性を定量的に評
価する。Further, the sum of the restraint reaction forces acting on the contact element 4 is calculated from the calculated stress in the contact element 4, and the sealability is quantitatively evaluated by comparing the restraint reaction force with the internal pressure.
【００１５】[0015]
【発明の効果】以上述べたように本発明によれば、ｕｙ
01−ｕｙ02＝ｕｙ1 −ｕｙ2 となる拘束条件を与えて初
期締付状態をモデル化し、締付力を二分割されたボルト
の両端における相対変位に等価置換して数値解析を行う
ことにより、耐圧状態においてボルトに発生する応力を
定量的に評価することができ、シール性についても接触
要素に発生する節点力あるいは応力から定量的に評価す
ることができる。As described above, according to the present invention, uy
By giving a constraint condition of 01- uy 02 = uy 1 -uy 2 and modeling the initial tightening state, the tightening force is equivalently replaced by the relative displacement at both ends of the bolt divided into two, and numerical analysis is performed. The stress generated in the bolt in the pressure resistant state can be quantitatively evaluated, and the sealing property can also be quantitatively evaluated from the nodal force or the stress generated in the contact element.
【図１】本発明の一実施例を示すフランジ構造の模式図
である。FIG. 1 is a schematic view of a flange structure showing an embodiment of the present invention.
１，２ フランジ ３ シール部材 ４ 接触要素 ６ 締結ボルト 1, 2 Flange 3 Seal member 4 Contact element 6 Fastening bolt
Claims (1)
ランジとシール部材の間に接触要素を挿入し、フランジ
をボルトで相互に締結するフランジ継手において、予め
ボルトを二分割したモデルを想定し、分割されたモデル
の両端に適当な締付力を載荷したときの軸方向における
ボルトの前記両端の変位をｕｙ01，ｕｙ02として算出
し、前記フランジ継手の耐圧状態における前記ボルトの
両端における変位をｕｙ1，ｕｙ2 として、 ｕｙ01−ｕｙ02＝ｕｙ1 −ｕｙ2 ＝δｙ（締結力と等価
な相対変位） を満たす拘束条件の下に有限要素法による数値解析によ
ってボルトに発生する応力および接触要素に発生する応
力を算出し、算出した応力に基づいてボルト強度および
シール性を評価することを特徴とするフランジ継手の強
度評価方法。Claim: What is claimed is: 1. A flange joint in which a seal member is interposed between flanges, a contact element is inserted between the flange and the seal member, and the flanges are fastened to each other by bolts. Assuming a model divided into two, the displacement of both ends of the bolt in the axial direction when suitable tightening force is applied to both ends of the divided model is calculated as uy 01 , uy 02 , and the pressure resistance state of the flange joint is calculated. as uy 1, uy 2 displacement at both ends of the bolt in the numerical analysis by the finite element method under the uy 01 -uy 02 = uy 1 -uy 2 = δy constraint satisfying (a fastening force equivalent relative displacement) The flange joint characterized in that the stress generated in the bolt and the stress generated in the contact element are calculated by the Strength evaluation method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15721791A JPH055659A (en) | 1991-06-28 | 1991-06-28 | Evaluation of strength of flange joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15721791A JPH055659A (en) | 1991-06-28 | 1991-06-28 | Evaluation of strength of flange joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH055659A true JPH055659A (en) | 1993-01-14 |
Family
ID=15644782
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15721791A Pending JPH055659A (en) | 1991-06-28 | 1991-06-28 | Evaluation of strength of flange joint |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH055659A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9840067B2 (en) | 2010-11-24 | 2017-12-12 | Mitsubishi Chemical Corporation | Heat-shrinkable laminated film, molded product and heat-shrinkable label comprising the film, and container |
-
1991
- 1991-06-28 JP JP15721791A patent/JPH055659A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9840067B2 (en) | 2010-11-24 | 2017-12-12 | Mitsubishi Chemical Corporation | Heat-shrinkable laminated film, molded product and heat-shrinkable label comprising the film, and container |
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