Damage Mechanics Approach for the Strength Evaluation of Solder Joint with Voids.

具有空洞焊点强度评估的损伤力学方法。

• 批准号: 12650097
• 负责人: MASANORI Kikuchi
• 金额: $ 2.18万
• 依托单位: Faculty of Science and Technology, Science University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650097/
• 关键词: Damage Mechanics; Solder Joint; Thermal Fatigue; Voids; Fatigue Life; 混合モード; 損傷解析

The effect of voids, which is nucleated in solder joint by re-flow method, on the fatigue strength is studied expermentally and numerically. Follwing results are obtained.(1)Voids are meausured expermantally by changing the solder, flux in three cases. It was found that large voids are nucleared for solder with large flux content. For small flux content solder many small voids are observed. It is impossible to avoid void nucleation during solder joint process.(2)The faitgue life is measured expermentally, and it is found that it is affected the existence of voids. Larger void rate decreaces tha fatigue life of solder joint.(3)On the fatigue fracture, many cracks are observed. They are branched fatigue cracks, which grow to the phase boundary of solder and pat, and terminate at the boundary.(4)The fatigue crack behavior is simulated by FEM applying the damage mechanics approach. The effect of the existence of voids on the fatigue life is estimated based on these numerical simulations. It is concluded that lager voids decrease the fatigue strength. Finally it is recommented to decrease the flux content in solder to decrease the voids nucleation.

通过重新流量方法在焊接关节中成核的空隙对疲劳强度进行了实验和数值研究。 （1）通过更改焊料，在三种情况下更换焊料，从而获得空隙。发现大型空隙是核核化，对于磁通量较大的焊料。对于小通量含量焊接，观察到许多小空隙。在焊接关节过程中，不可能避免空隙成核。（2）经过实验测量了菲格的寿命，发现它影响了空隙的存在。较大的空隙速率降低了焊接关节的疲劳寿命。（3）在疲劳骨折上，观察到许多裂缝。它们是分支的疲劳裂纹，生长到焊料和PAT的相边界，并在边界处终止。（4）疲劳裂纹行为是通过使用损害力学方法的FEM模拟的。基于这些数值模拟，估算了空隙对疲劳寿命的影响。得出的结论是，啤酒空隙会降低疲劳强度。最后，它被推荐以减少焊料中的通量含量，以减少空隙成核。

项目成果

M.Kikuchi and M.Geni: "A Damage Model for Voil Configuration and Failure under Different Constratint Deformation Region in Ductle Matrix"Key Engineering Materials. Vols.183-187. 625-630 (2000)

M.Kikuchi和M.Geni：“导管基体中不同约束变形区域下的Voil配置和失效的损伤模型”关键工程材料。

菊池, 高橋: "異なる負荷形式下のディンプル破壊ュレーション"日本機械学会論文集. A67,656. 665-670 (2001)

Kikuchi, Takahashi：“不同载荷类型下的凹坑断裂”，日本机械工程师学会汇刊 A67,656 (2001)。

M.Geni and M.Kkuchi: "A Micro Damage Model for Local Void Coalesence in Ductile Matrix"Advances in Computational Engineering & Science. Vol.II. 1098-1103 (2000)

M.Geni 和 M.Kkuchi：“延性基体中局部空洞合并的微损伤模型”计算工程进展

M.Kikuchi, D.Katagiri: "Study on the Mixed Mode Fatigue Crack Growth Behavior"Adavances in Computational Engineering & Science. vol.1. 1065-1070 (2000)

M.Kikuchi、D.Katagiri：“混合模式疲劳裂纹扩展行为的研究”计算工程进展

M.Kikuchi., S.Ogihara and Y.Kashima: "Analysis of Microscopic Crack Growth in 90ply of CFRP Cross-Ple Laminates"Advances in Computational Engineering & Science. Vol.II. 1110-1115 (2000)

M.Kikuchi.、S.Ogihara 和 Y.Kashima：“90 层 CFRP 交叉层压板中微观裂纹扩展的分析”计算工程进展