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溶接接合体の故障行為とメカニズム 熱力学結合負荷下での溶接接合体の故障行為とメカニズム
Yuxin Deng1,2, Si Chen2, Peijiang Liu2
1School of Material and Energy, Guangdong University of Technology, Guangzhou 510006, China.
Materials (Basel, Switzerland)
|February 13, 2026
まとめ
電子機器は,不一致の熱膨張による熱疲労障害に直面しています. この研究は,コフィン・マンソンモデルにおける安定したストレスを用いて寿命予測を精製し,溶接接合体の信頼性の精度を向上させます.
科学分野:
- 材料科学 材料科学とは
- 機械工学の機械工学
- 信頼性のエンジニアリング
背景:
- 電子機器は熱サイクルを経験し,異なる熱膨張係数 (CTE) からストレスが発生します.
- このストレスは,溶接接合体のサイクルストレスの原因となり,亀裂を引き起こし,相互接続の故障を引き起こします.
- Sn3.5Agの溶接接頭は,熱疲労に敏感な重要な部品です.
研究 の 目的:
- CTEミスマッチの下でSn3.5Ag溶接接合体の熱疲労障害メカニズムを調査する.
- 安定したストレスを用いた熱疲労寿命の評価のための洗練された方法を提案する.
- 溶接接合体の信頼性を評価するためのより信頼性の高い基礎を確立する.
主な方法:
- 数値シミュレーションと実験分析を用いた.
- 溶接接頭-パッドインターフェイスのクラック開始部位を特定しました.
- 抽出した等価な粘性プラスチックの菌株は,安定状態ヒステリック応答から範囲内です.
- 生命予測のためのコフィン・マンソンモデルに安定したストレスを適用した.
主要な成果:
- 関節パッドのインターフェイスで交互に切断ストレスの濃度を交互に切断し,主要なクラック開始部位として特定しました.
- 提案された方法は,一時的な方法と比較して,ストレスの過大評価を軽減します.
- 溶接接合体の熱疲労寿命が予測されているのは18,930サイクルです.
- 臨界点におけるより高い粘性プラスチックのストレスのエネルギー密度が確認され,エネルギー分散が損傷を引き起こすことを示しています.
結論:
- Coffin-Mansonモデルの適用のために安定したストレスを使用するという仮説は支持されています.
- 洗練された方法は,熱疲労寿命の評価のためのより合理的な物理的基礎を提供します.
- 変形,循環反応,エネルギー消耗を理解することは,信頼性の高い溶接接合体の寿命評価の鍵です.
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