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Research on a technique of restraining fatigue crack growth using wedge effects of corrosion products

利用腐蚀产物楔形效应抑制疲劳裂纹扩展技术的研究

基本信息

批准号：
20K04677
负责人：
高橋一比古
金额：
$ 2.5万
依托单位：
National Institute of Maritime, Port and Aviation Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2020
资助国家：
日本
起止时间：
2020-04-01 至 2024-03-31
项目状态：
已结题

项目摘要

疲労き裂の内部に腐食生成物が生じると、所謂くさび効果によってき裂進展速度が大幅に抑制される場合がある。腐食環境下におけるき裂の進展挙動は、くさび効果による抑制作用と腐食溶解等による加速作用のせめぎ合いとなるため、前者が相対的に卓越するような湿潤環境をき裂内に作り出すことができれば、き裂進展を効果的に抑制することが可能となる。そこで本研究では、湿潤環境をき裂内で局所限定的に実現する手段として高含水率の含水ジェルを用いたき裂進展抑制シートを試作し、その有効性について検証を行う。2022年度は、前年度に引き続き鋼平板試験片を用いたき裂進展試験を実施し、試作したき裂進展抑制シートの性能評価を行った。具体的には、市販の含水ジェルシートに蒸留水、塩水または人工海水を含浸させたものを用いて含水成分の影響をみるとともに、流電陰極層や流電陽極層の効果についても比較検討を行った。その結果、試験片の片側にき裂進展抑制シートを適用し、反対側は通気口とした場合、試作したすべての進展抑制シートについて有意な進展抑制効果、ひいては寿命延伸効果を有することがわかった。母材ままの場合と破断寿命で比較すると、蒸留水を用いた場合で2.1～2.4倍、3%食塩水を用いた場合で4.1～5.5倍、人工海水を用いた場合で6.5～9.6倍となった。含水ジェルシートの上から流電陰極層として銅箔テープを適用して試験片と適宜導通させた場合、蒸留水を用いた場合には有意な差異が認められなかったが、3%食塩水または人工海水を用いた場合には陰極層の効果が現れ、前者で35%、後者で47%の更なる寿命延伸がそれぞれ認められた。含水ジェル及び上記の流電陽極層を用いた、き裂内析出物のくさび効果によるき裂進展抑制方法については前年度に特許出願済みだが、今年度は更に実施例データを追加した上で請求項を整理し、国内優先権主張出願を行った。

The internal corrosion products of the fatigue crack are not raw, and the so-called cracking effect is that the progress speed of the crack is greatly suppressed and the occasion is reduced. Under the environment of scavenging, the progress of the cracking of the cracks and the progress of the cracks, the effect of the cracks, the inhibitory effect of the scavenging, the acceleration of the dissolution of the scavengers, the combination of the cracks, and the former The superior performance of the relationship between the two is the humidity of the environment, the crack in the crack is made, and the progress of the crack is suppressed by the crack effect. This research is based on the fact that the humid environment is limited by the cracks in the cracks, and the means are high moisture content. Water-containing water is used to suppress the cracking progress of water-containing water and is used to test the effectiveness of water-containing water. In the 2022 fiscal year and the previous year, the steel flat plate test piece was used to test the crack progress and the crack progress was inhibited and the test performance was evaluated. Specific water, commercially available water-containing water, distilled water, artificial seawater, chlorine water, artificial seawater, impregnated water, etc. The effect of the water-containing component is better than that of the galvanic cathode layer and the galvanic anode layer.そのresults, the test piece side and the crack progression inhibition test are applicable, the reverse side of the test piece is passed through the mouth, and the trial production is used It has a progression-inhibiting effect and a life-extending effect. When the base material is used, the breaking life is 2.1 to 2.4 times, and when the water is evaporated, it is 2.1 to 2.4 times. When using natural water, it is 4.1 to 5.5 times, and when artificial seawater is used, it is 6.5 to 9.6 times. Water-containing stainless steel flow current cathode layer and copper foil copper foil applicable test piece It is suitable for the occasion of conduction and the occasion of steaming and retaining water. It is also suitable for the occasion. The difference is not recognized. The effect of the cathode layer can be realized when using artificial seawater with 3% sodium chloride water.れ, the former is 35%, the latter is 47%, and the life extension is longer. The effect of water-containing gas and the above-mentioned galvanic anode layer, the effect of the precipitate in the crack, the method of inhibiting the progress of cracks, the previous year This year's patent application has been revised, this year's updated regulations have been added, and the requested items have been sorted out, and the domestic priority application has been approved.