JPS5951330A - Fabrication of brittleness crack propagation stopping test piece - Google Patents
Fabrication of brittleness crack propagation stopping test pieceInfo
- Publication number
- JPS5951330A JPS5951330A JP16101582A JP16101582A JPS5951330A JP S5951330 A JPS5951330 A JP S5951330A JP 16101582 A JP16101582 A JP 16101582A JP 16101582 A JP16101582 A JP 16101582A JP S5951330 A JPS5951330 A JP S5951330A
- Authority
- JP
- Japan
- Prior art keywords
- test piece
- notch part
- notch
- bead
- crack propagation
- 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
Classifications
-
- 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
-
- 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
- G01N2203/026—Specifications of the specimen
- G01N2203/0298—Manufacturing or preparing specimens
Landscapes
- 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)
- Sampling And Sample Adjustment (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は鋼板の溶接部に生じた脆性き裂の伝播停止と溶
接部の靭性との′関係を測定するだめの試験片の製作方
法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a test piece for measuring the relationship between the stoppage of propagation of brittle cracks occurring in a welded part of a steel plate and the toughness of the welded part.
鋼板溶接部の持つ破壊靭性としては、脆性き裂の発生ま
での靭性と、脆性き裂停止までの靭性とがあり、前者に
ついては、すでに多くの検討がなされ、各種試験方法や
破壊条件などが提案されて、設計、施行や事故解析に用
いられてきた。しかしながら脆性き裂停止については、
脆性き裂の伝播停止現象の把握が困難なこと、き裂“発
生”がなければ“伝播停止”もないことから二次的であ
ること、大形試験片が必要であると考えられていたこと
などから、限られた検討しかなされていなかった。そし
て、従来、との脆性き裂を小形の試験片を用いて検討す
るＭＲＬ （Ｍａｔｅｒｉａｌ Ｒｅ５ｅａｉｃｈ Ｉ
、ａｂｏｒａｔｏｒｙ ）式脆性き裂試験に必要な試験
片の製作にあたっては、第１図に示すように脆性き裂を
発生させ易くするだめに必要な脆化ビード１を、脆化ビ
ード用の特殊溶接棒を用いた手溶接により作成し、ビー
ド形状を整えるために、脆化ビードに電解研摩によって
切欠き先端に更に電解研摩によって切欠き２を形成して
いた。しかしながら、かかる従来の試験片製作法では、
脆化ビード用の特殊な溶接棒や電解研摩装置が必要々の
で試験片製作に手間がかかり、また手溶接で脆化ビード
を作成するので切欠き市ｎが広くなシ、従って応力を集
中さ騒ることかできず脆性き−を精度良く発生させるこ
とが困難であった。The fracture toughness of a steel plate weld includes the toughness up to the initiation of a brittle crack and the toughness up to the stoppage of the brittle crack.The former has already been extensively studied, and various test methods and fracture conditions have been developed. It has been proposed and used in design, implementation, and accident analysis. However, regarding brittle crack arrest,
It was thought that it was difficult to understand the phenomenon of brittle crack propagation stopping, that it was secondary as there was no “stopping of propagation” unless a crack “initiated”, and that large-sized test pieces were necessary. For this reason, only limited consideration has been given. Then, conventional MRL (Material Research I) is used to examine brittle cracks using small test pieces.
, aboratory ) type brittle crack test, as shown in Figure 1, the embrittlement bead 1 necessary to facilitate the generation of brittle cracks is welded using a special welding method for the embrittlement bead. It was created by manual welding using a rod, and in order to adjust the bead shape, a notch 2 was further formed at the tip of the notch by electrolytic polishing in the embrittled bead. However, in such conventional test piece manufacturing methods,
Because a special welding rod and electrolytic polishing equipment are required for the embrittlement bead, it takes time to prepare the test piece.Also, because the embrittlement bead is created by hand welding, the notch area is wide, and stress is therefore concentrated. However, it was difficult to generate brittle cracks accurately.
そこで本発明は、かかる現状にかんがみ、脆性き裂伝播
停止試験のだめの試験片の製作方法に着目してなされた
ものであり、特殊な脆化ビードや電解研摩を用いる必要
がなく、切欠き巾が従来よりも狭くなるので応力集中の
度合を高めることができるので精度良く脆性き裂を発生
させることができるなどの特長を有する。Therefore, in view of the current situation, the present invention was made by focusing on a method for manufacturing a test piece for a brittle crack propagation arrest test, which eliminates the need to use a special embrittling bead or electrolytic polishing, and reduces the notch width. Since it is narrower than before, it is possible to increase the degree of stress concentration, so it has the advantage of being able to generate brittle cracks with high precision.
すなわち本発明の脆性き裂伝播停止試験片の製作方法は
、試験片に切欠部を形成して該切欠部に溶加材を置き、
電子ビーム溶接により該切欠部にビードを形成せしめる
ことを特徴とするものである。That is, the method for manufacturing a brittle crack propagation arresting test piece of the present invention includes forming a notch in the test piece, placing a filler metal in the notch,
This is characterized in that a bead is formed in the notch by electron beam welding.
以下、本発明を図面に示した実施例にもとづき説明する
。The present invention will be described below based on embodiments shown in the drawings.
まず、第２図ＡおよびＢに示す四角形状の試験片６に切
欠部４を形成する。ここで試験片６および切欠部４の寸
法は特に限定されるものではなく、たとえば第２図Ａに
示すような寸法を有している。First, a notch 4 is formed in a rectangular test piece 6 shown in FIGS. 2A and 2B. Here, the dimensions of the test piece 6 and the notch 4 are not particularly limited, and have dimensions as shown in FIG. 2A, for example.
次に第３図に示すように切欠部４の底部に溶加材５を置
き電子ビーム溶接をしてビード６を形成せしめる。脆化
を形成するための溶加材５としでは、安価で脆化度の大
きい材料を選択するのが好ましく、試験片６が鋼の場合
にはアルミニウム、チタンなどが用いられ、より安価な
アルミニウムの使用が好ましい。なお、脆性き裂の発生
をガイドするために、切欠部４の先端に溝１２を形成し
ておき、応力集中の度合をより高めることができる。Next, as shown in FIG. 3, a filler metal 5 is placed at the bottom of the notch 4 and electron beam welding is performed to form a bead 6. As the filler metal 5 for forming embrittlement, it is preferable to select a material that is inexpensive and has a high degree of embrittlement, and when the test piece 6 is steel, aluminum, titanium, etc. are used, and the cheaper aluminum It is preferable to use In addition, in order to guide the occurrence of brittle cracks, a groove 12 is formed at the tip of the notch 4 to further increase the degree of stress concentration.
このように本発明によれば、試験片の切欠き部に溶加材
を置いて電子ビーム溶接をするだけで、脆性き裂伝播停
止試験片を製作することができる。As described above, according to the present invention, a brittle crack propagation arresting test piece can be manufactured simply by placing a filler metal in the notch of the test piece and performing electron beam welding.
次にこのようにして製作した試験片を用いた脆性き裂試
験の概要について述べる。Next, we will provide an overview of the brittle crack test using the specimens fabricated in this way.
まず第４図に示すような試験装置７の基板８上に試験片
３を置き、冷浴８中で冷媒により冷却する。なお、温度
は熱電対９により測定する。First, a test piece 3 is placed on a substrate 8 of a test apparatus 7 as shown in FIG. 4, and cooled in a cold bath 8 with a refrigerant. Note that the temperature is measured by a thermocouple 9.
次に試験片３のビード６（第３図）に割ピン１０を置き
、くさび１１に矢印Ａ方向に力を加えて、試験片の切欠
部４を開口させて脆性き裂を溝１２に沿って発生させ、
伝播停止させる。そして、（３）
き裂停止時の開口変化および停止き裂長さから脆性き裂
伝播停止靭性値（Ｋ＋ａ）を求める。従って脆性き裂が
発生しなかったり、試験片を破断してしまったときには
、Ｋｔａ値は求められないことになる。Next, a cotter pin 10 is placed on the bead 6 of the test piece 3 (Fig. 3), and a force is applied to the wedge 11 in the direction of arrow A to open the notch 4 of the test piece and cause the brittle crack to grow along the groove 12. generate it,
Stop the propagation. Then, (3) the brittle crack propagation arrest toughness value (K+a) is determined from the change in opening at the time of crack arrest and the arrest crack length. Therefore, if a brittle crack does not occur or the test piece breaks, the Kta value cannot be determined.
以上述べた如く、本発明によれば、脆性き裂伝播停止試
験片を、試験片に予め形成された切欠き部に溶加材を置
いて電子ビーム溶接するだけで良いので、操作が簡るし
く簡略化される。As described above, according to the present invention, it is only necessary to place a filler metal in a notch formed in advance in the test piece and perform electron beam welding on the brittle crack propagation arrest test piece, which simplifies the operation. It is simplified as follows.
従来のように手溶接したり、切欠き部を電解研摩する必
要は全くない。また、溶加材として従来のように特殊な
溶接棒を使用する必要がなく、アルミニウムやチタンな
どを用いれば良い。There is no need for manual welding or electrolytic polishing of the notches as in the past. Furthermore, there is no need to use a special welding rod as in the past as a filler metal, and aluminum, titanium, or the like may be used.
かつ電子ビーム溶接なので、切欠き部巾が広がることが
なく、従ってき裂を発生させる際の応力集中の度合を高
めることができ、従って試験片に精度良く脆性き裂を発
生させることができ、試験片の無駄がなくなり、効率良
く試験を行なうことができる。In addition, since it is electron beam welding, the width of the notch does not widen, which increases the degree of stress concentration when generating cracks, making it possible to accurately generate brittle cracks in the test piece. There is no wastage of test pieces, and tests can be carried out efficiently.
（４）
第１図は従来の脆性き裂伝播停止試験片の概要を示す斜
視図、第２図Ａは本発明で用いる試験片本体の実施例を
示す平面図、第２図Ｂはその側面図、第３図は本発明に
おけるビード形成状況を示す要部説明図、第４図は脆性
き裂伝播停止試験装置の概要を示す斜視図である。
６・・・試験片本体、４・・・切欠部、５・・・溶加材
、６・・・ビード。
代理人 弁理士 小 川 信 −
弁理士 野 口 賢 照
弁理士斎下和彦
第３図
４
第４図(4) Figure 1 is a perspective view showing an outline of a conventional brittle crack propagation arrest test piece, Figure 2A is a plan view showing an embodiment of the test piece body used in the present invention, and Figure 2B is a side view thereof. FIG. 3 is an explanatory view of the main part showing the bead formation situation in the present invention, and FIG. 4 is a perspective view showing an outline of a brittle crack propagation arrest test apparatus. 6... Test piece body, 4... Notch, 5... Filler metal, 6... Bead. Agent Patent Attorney Shin Ogawa − Patent Attorney Ken Noguchi Teru Patent Attorney Kazuhiko Saishita Figure 3 Figure 4
Claims (1)
、電子ビーム溶接により該切欠部にビードを形成せしめ
ることを特徴とする脆性き裂伝播停止試験片の製作方法
。1. A method for producing a brittle crack propagation arresting test piece, which comprises forming a notch in a test piece body, placing a filler metal in the notch, and forming a bead in the notch by electron beam welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16101582A JPS5951330A (en) | 1982-09-17 | 1982-09-17 | Fabrication of brittleness crack propagation stopping test piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16101582A JPS5951330A (en) | 1982-09-17 | 1982-09-17 | Fabrication of brittleness crack propagation stopping test piece |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5951330A true JPS5951330A (en) | 1984-03-24 |
Family
ID=15726955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16101582A Pending JPS5951330A (en) | 1982-09-17 | 1982-09-17 | Fabrication of brittleness crack propagation stopping test piece |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5951330A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020071149A (en) * | 2018-10-31 | 2020-05-07 | 日本製鉄株式会社 | Brittle crack propagation stopping characteristics test method and test piece |
-
1982
- 1982-09-17 JP JP16101582A patent/JPS5951330A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020071149A (en) * | 2018-10-31 | 2020-05-07 | 日本製鉄株式会社 | Brittle crack propagation stopping characteristics test method and test piece |
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