| PREDICTION OF FAILURE CHARACTERISTICS OF SPOT WELDS OF DP AND TRIP STEELS WITH AN EQUIVALENT STRENGTH FAILURE MODEL |
| J. HA1, H. HUH1, J. H. LIM2 |
1KAIST
2KITECH
3POSCO |
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| ABSTRACT |
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This paper proposes a new equivalent failure strength model for spot welds under combined axial and shear loading. To evaluate the pure-shear strength of spot welds fabricated under the same welding conditions with a two-layered lap joint, a test fixture and a specimen were newly designed and proposed. The failure tests of spot welds of TRIP590 1.2t, DP780 1.0t, DP780 1.2t, and DP980 1.2t were carried out at seven different loading angles ranging from 0o to 90o at an internal angle of 15o to obtain the failure loads. The failure loads obtained from the experiments were utilized to construct the failure criterion and thus describe the failure behavior of spot welds in the crash analysis or strength analysis of an auto-body. It is noted that the value of |
| Key Words:
Resistance spot weld, Advanced high strength steel, Combined axial and shear load, Failure model, Equivalent failure strength |
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