Numerical Simulation of Residual Stress Distribution of Spot Welded ...

Numerical Simulation of Residual Stress Distribution of Spot Welded High-strength Steel
Sheets
高強度鋼板抵抗スポット溶接部の残留応力シミュレーション
Muneyoshi Iyota Osaka Institute of Technology
Masahito Mochizuki Osaka University
伊與田宗慶（大阪工業大学）
望月正人（大阪大学）
Abstract / アブストラクト
In recent years, the application of high-strength steel sheet to automobile
structural components has been promoted to reduce body weight and improve
fuel efficiency. Moreover, advanced high-strength steel (AHSS) which tensile
strength more than 1000 MPa has been developed. Now, high-strength steel
sheet and AHSS are being used extensively for automobile bodies and are having
a positive impact on the industry and the environment.
Resistance spot welding is a common joining method used for assembling steel
sheets. To use high-strength steel sheet in automobile, it is necessary to ensure
the strength of their spot welded joints.
However, the joint strength of
high-strength steel sheets does not increase, because of special characteristics in
the spot welds. Especially, in many cases, spot welded joint using AHSS show
the brittle fracture.
Therefore, residual stress, a one of the special
characteristics in the spot welds, can be influenced on the decreasing of joint
strength. However, very few studies have been reported on the residual stress
distribution of spot welded high-strength steel sheets.
In this study, residual stress distribution of spot welded high-strength steel
sheets was investigated by using the numerical simulation. Moreover, the effect
of welding condition on the residual stress distribution was examined.

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