JPS63231240A - Method for detecting crack generation limit strain of thin film coating - Google Patents
Method for detecting crack generation limit strain of thin film coatingInfo
- Publication number
- JPS63231240A JPS63231240A JP6270087A JP6270087A JPS63231240A JP S63231240 A JPS63231240 A JP S63231240A JP 6270087 A JP6270087 A JP 6270087A JP 6270087 A JP6270087 A JP 6270087A JP S63231240 A JPS63231240 A JP S63231240A
- Authority
- JP
- Japan
- Prior art keywords
- strain
- thin film
- test piece
- crack generation
- crack
- 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
- 239000010409 thin film Substances 0.000 title claims abstract description 5
- 238000009501 film coating Methods 0.000 title claims description 3
- 238000000034 method Methods 0.000 title description 5
- 238000005452 bending Methods 0.000 claims abstract description 4
- 238000012360 testing method Methods 0.000 claims description 20
- 239000000919 ceramic Substances 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000011247 coating layer Substances 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 abstract description 4
- 238000000576 coating method Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 3
- 238000003825 pressing Methods 0.000 abstract 1
- 238000005524 ceramic coating Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はセラミックス等のコーテイング膜のクラツク発
生限界歪の検出法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for detecting the critical strain for crack generation in coating films such as ceramics.
金属の表面にコーティングされたセラミックス等の被膜
にクランクが生じる限界の歪金実験的に求める場合、従
来は引張試験片（第４図の符号６）に段階的な歪を与え
て、それぞれの試験片を顕微鏡によシフラック（第４図
の符号７）の有無を調べていｆｃ（第５図）。To experimentally determine the strain limit at which cranking occurs in a coating such as ceramics coated on the surface of a metal, conventionally a tensile test piece (reference numeral 6 in Figure 4) is subjected to gradual strain, and each test is The piece was examined under a microscope for the presence or absence of siflac (numeral 7 in Fig. 4) (Fig. 5).
前述のような従来の方法で１は、−試験片に一条件の歪
しか与えられない為
（１） クラックが発生する歪の限界値を正しく求め
られない。In the conventional method as described above, (1) the limit value of strain at which cracks occur cannot be accurately determined because only one condition of strain is applied to the test piece;
（２）条件数に応じた数の試験片が必要となる。(2) A number of test pieces are required according to the number of conditions.
という欠点があった。There was a drawback.
また−試験片で歪を少しずつ増しながらクシツクの調査
をする方法では、試験片を試験機に取付は取外す手間が
かかっていた。Furthermore, in the method of investigating the stiffness while gradually increasing the strain on the test piece, it was time-consuming to attach and remove the test piece from the testing machine.
曲げ試験片を用いて歪分布がＯからある一定値まで連続
的に負荷し、同時に歪ゲージにより試験片の歪分布を求
めておく。除荷後に試験片の歪ゲージ貼付側のコーテイ
ング面を顕微鏡で調ベクラックが発生している位置を求
める。Using a bending test piece, a strain distribution is continuously applied from O to a certain constant value, and at the same time, the strain distribution of the test piece is determined using a strain gauge. After unloading, examine the coated surface of the test piece on the side where the strain gauge is attached using a microscope to determine the location where cracks have occurred.
クラックが発生している領域と発生していない領域の境
界の位置の歪の値が、゛クラック発生の限界歪として、
短時間でかつ段階的でなく求められる。The strain value at the boundary between the cracked area and the non-cracked area is defined as the critical strain for crack generation.
Required in a short period of time and in a non-stepwise manner.
第１図に示すように、試験片は母材１（本実施例では４
ｇ×１０ｍｍ×（イ）囚〕にコーティング２（Ｃｒ０２
．Ｃｒ３Ｏ２等）ヲ施シ、表ｉにｑ間隔に歪ゲージ３全
貼付したものを用いる。第１図の載荷手段４及び５の位
置に圧力を加え、試験片に第２図（イ）に示すような分
布の歪を与え、歪ゲージ３によシ歪を計測記録する。As shown in Fig. 1, the test piece was made of base material 1 (4
Coating 2 (Cr02
．． Cr3O2, etc.), and use one in which all three strain gauges are pasted at q intervals in Table i. Pressure is applied to the positions of the loading means 4 and 5 shown in FIG. 1 to give the test piece a strain with a distribution as shown in FIG. 2 (a), and the strain is measured and recorded by the strain gauge 3.
除荷後試験片を顕微鏡により調べ、第２図（ロ）に示す
ようシで、クラック７が存在する範囲を求める。After unloading, the test piece is examined under a microscope, and the range in which the crack 7 exists is determined as shown in FIG. 2 (b).
クラックが存在する最小の歪が第２図に示すように（イ
）と（ロ）の関係から求める。即ち、第２図（イ）のａ
％及び４７％が限界歪である。The minimum strain at which a crack exists is determined from the relationship between (a) and (b) as shown in Figure 2. That is, a in Figure 2 (a)
% and 47% are critical strains.
本試験は第３図に示すように片持梁型の試験片又は構造
でも実施が可能であろう
〔発明の効果〕
従来金属等の表面にコーティングされたセラミック等の
クラック発生の限界は多数の試験片を用いて段階的に求
める等の方法によっていたが、本発明によれば１個の試
験片によりかつ段階的でなく求められる。This test may also be carried out with a cantilever type test piece or structure as shown in Figure 3. [Effects of the Invention] Conventionally, there are many limitations on the occurrence of cracks in ceramics coated on the surface of metals, etc. Previously, it was determined stepwise using a test piece, but according to the present invention, it is determined using a single test piece without stepwise steps.
従って、セラミックコーティング等の強度の比較を容易
かつ安価に精度よく行うことが出来る。Therefore, the strength of ceramic coatings and the like can be compared easily, inexpensively, and accurately.
セラミックコーティング等の開発における試駆手段とし
て極めて有効であると考えられる。It is considered to be extremely effective as a trial method in the development of ceramic coatings, etc.
第１図は本発明薄膜コーティングのクラック発生限界歪
検出法の実施例を示す。第２図（イ）（ロ）は第１図の
歪検出法によシ試験片に発生する歪分布とクラックを示
し、第３図は片持梁を用いる本発明の他の実施例を示す
。第４図は従来の試験片と試験方法を示し、第５図は従
来のクラック限界歪の求め方を示す。
１．１′・・・試験片母材 ２・・・コーティング
層３・・・歪ゲージ ４，５．５’・・・載
荷点７・・・クラック
代 理 人 弁理士 岡 本 重 又
外２名
第３図
第４図
第５図
歪FIG. 1 shows an embodiment of the method for detecting the critical strain for crack generation in a thin film coating according to the present invention. Figures 2 (a) and (b) show the strain distribution and cracks that occur in the specimen using the strain detection method shown in Figure 1, and Figure 3 shows another embodiment of the present invention using a cantilever beam. . FIG. 4 shows a conventional test piece and a test method, and FIG. 5 shows a conventional method for determining the crack critical strain. 1.1'...Test piece base material 2...Coating layer 3...Strain gauge 4,5.5'...Loading point 7...Crack agent Patent attorney Shige Okamoto Matato 2 Figure 3 Figure 4 Figure 5 Distortion
Claims (1)
ジを貼付した金属試験片に曲げ力を負荷し、コーティン
グ層が破損しクラックが発生する限界の歪を検出するこ
とを特徴とする薄膜コーティングのクラック発生限界歪
検出法。Crack generation in thin film coatings is characterized by applying bending force to a metal test piece coated with a thin film of ceramic, etc., and then applying a bending force to a metal test piece to which a strain gauge is attached, and detecting the limit strain at which the coating layer breaks and cracks occur. Limit strain detection method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6270087A JPS63231240A (en) | 1987-03-19 | 1987-03-19 | Method for detecting crack generation limit strain of thin film coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6270087A JPS63231240A (en) | 1987-03-19 | 1987-03-19 | Method for detecting crack generation limit strain of thin film coating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63231240A true JPS63231240A (en) | 1988-09-27 |
Family
ID=13207839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6270087A Pending JPS63231240A (en) | 1987-03-19 | 1987-03-19 | Method for detecting crack generation limit strain of thin film coating |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63231240A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH085530A (en) * | 1994-06-14 | 1996-01-12 | Agency Of Ind Science & Technol | Method for measuring critical strain amount of coating film and coating film destroyed position detector used for the method |
| JP2008292331A (en) * | 2007-05-25 | 2008-12-04 | Toshiba Corp | Stress corrosion cracking test method |
| WO2013049252A1 (en) * | 2011-09-26 | 2013-04-04 | Fmc Technologies, Inc. | Apparatus and method for detecting cracks in flow pipes |
-
1987
- 1987-03-19 JP JP6270087A patent/JPS63231240A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH085530A (en) * | 1994-06-14 | 1996-01-12 | Agency Of Ind Science & Technol | Method for measuring critical strain amount of coating film and coating film destroyed position detector used for the method |
| JP2008292331A (en) * | 2007-05-25 | 2008-12-04 | Toshiba Corp | Stress corrosion cracking test method |
| WO2013049252A1 (en) * | 2011-09-26 | 2013-04-04 | Fmc Technologies, Inc. | Apparatus and method for detecting cracks in flow pipes |
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