塑性域締結されたねじ締結体の疲労強度向上に関する研究

提高螺钉紧固体塑性区域疲劳强度的研究

• 批准号: 05750141
• 负责人: 辻 裕一
• 金额: $ 0.58万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Encouragement of Young Scientists (A)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 无数据
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-05750141/
• 关键词: ねじ; ねじ締結体; ボルト; 塑性域締付け; 弾塑性解析

ねじ締結体に静的あるいは動的荷重が作用する場合,外力の一部がねじに追加軸力として作用する.塑性域締結されたねじ締結体の疲労強度の推定に重要なねじの追加軸力に対する挙動について,解析的な検討を行い,実験結果とも比較し,締結体の外力負荷における設計基準となることを示した.塑性域締付けにより得られるボルト軸力,すなわち降伏締付け軸力は,締付けにより生じる軸力およびねじ部トルクの組合せ応力により決定され,全断面降伏を考慮した剛塑性体問題の解に基づき推定することが可能であり,推定値はボルト・ナットの塑性域締付け試験の実験結果と良い一致を示した.締付け後の外力により追加軸力が作用する場合の挙動も降伏締付け軸力の場合と同様に軸力と残留ねじ部トルクの組合せ応力に支配される.円柱に軸方向ひずみとねじりが同時に作用することによる全断面降伏を初期条件として,ねじり角一定で軸方向ひずみが増大する弾塑性問題について,ひずみ増分理論に基づく解析解を求めた.これにより円柱のひずみと軸力の関係が与えられる.ボルトのねじ部を円柱にモデル化し,上記の解をねじに適用した.M10強度区分10.9のボルトについて解析結果と実験結果を比較検討した.追加軸力の勾配は締付け終了後に残留するねじ部トルクに影響され,締付け後のねじ部トルクの減少が少ない程勾配は減少する実験結果が得られた.解析はねじ部トルクの減少がない場合に相当し,実験結果とも良い一致を示した.最も厳しい条件で得られた本解析結果は追加軸力による追加塑性伸びを評価するための設計基準となる.

The load-bearing effect of the static load force is in good agreement with each other, and the external force is responsible for the additional force effect. In the plastic domain, the fatigue strength of the system is presumed to be important, the additional force is used to analyze the data, and the results are compared. the results are compared with each other, and the results are compared with each other. In the plastic domain, the force is reduced, the force is subdued, the force is determined, the whole section is reduced, the plastic body problem is presumed, and the basis is presumed to be affected. It is presumed that the plastic field is in good agreement with each other in the plastic domain. After the payment, the external force is required to act as an additional force, and the force is reduced, and the residual force is the same. At the same time, the column is in the right direction. In the same time, the full cross-section is reduced in the initial stage, and the angle must be in the direction of the column. The plastic problem is very difficult, and the basic analytical solution is very important. The strength of the column is different from that of the column. In the first part of this paper, the column is divided into two parts, and the strength of the column is used to distinguish the strength of the column. M10 is used to distinguish the strength of 10.9%. The results show that the results are better than those of the previous one. After the additional information is added, the remaining parts of the system will be affected. After the payment, you will be able to obtain the results of the program matching. The results of the analysis show that the results are consistent with each other. The most effective conditions are obtained. The analytical results show that the mechanical properties of the plastic tensile test are very high, and the basic design standards are very high.