Dynamic Separation of Resistance Spot Welded Joints: Part I—Experiments

An analysis for an impact system is presented. The results are then used to interpret the test data from dynamic separation of resistance spot welded joints. In this Part I of the investigation emphasis is placed on the design consideration, development of a test system and verification of the design from actual test data obtained from the test system. In addition, the inertia effect of a generic dynamic system is analyzed using the principle of rigid body dynamics. It is shown that the load recorded by a load cell could include both the load experienced by the test specimen and the inertia force generated from the mass and acceleration between the specimen and the load cell, when the load cell is placed on the fixed side of the test specimen. Impact fixtures designed for spot weld strength testing are then studied for the inertia effect.

[1]  Tau Tyan,et al.  Failure loads of spot weld specimens under impact opening and shear loading conditions , 2004 .

[2]  X. Zhu,et al.  Quasi-Static and Impact Strength of Fatigue Damaged Spot Welds , 2003 .

[4]  Y. Zhou,et al.  Effects of weld microstructure on static and impact performance of resistance spot welded joints in advanced high strength steels , 2008 .

[6]  H. Huh,et al.  EFFECT OF TENSILE SPEED ON THE FAILURE LOAD OF A SPOT WELD UNDER COMBINED LOADING CONDITIONS , 2008 .

[7]  R. S. Birch,et al.  Dynamic failure of structural joint systems , 2000 .

[8]  Y. Chao,et al.  Dynamic Separation of Resistance Spot Welded Joints: Part II—Analysis of Test Results and a Model , 2010 .

[9]  N. Johnson,et al.  Development of a high-efficiency modeling technique for weld-bonded steel joints in vehicle structures, Part II: Dynamic experiments and simulations , 2009 .

[10]  Emin Bayraktar,et al.  Application of impact tensile testing to spot welded sheets , 2004 .

[11]  Michael J. Dixon,et al.  Development of a load-cell compensation system , 1991 .

[12]  Yuh J. Chao,et al.  Ultimate Strength and Failure Mechanism of Resistance Spot Weld Subjected to Tensile, Shear, or Combined Tensile/Shear Loads , 2003 .

[13]  M. Dixon.  Errors in dynamic force measurement , 1988 .

[14]  Hongyan Zhang,et al.  Impact strength measurement of spot welds , 2001 .

[15]  Robert Thompson,et al.  Static and Impact Strengths of Spot-Welded HSLA and Low Carbon Steel Joints , 1982 .