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Study on static and fatigue strength of structural adhesive-bonded joints of steel sheets for automotive application

机译：用于汽车应用钢板结构粘合接头的静力和疲劳强度研究

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摘要

The static and fatigue strength of crush durable structural adhesive-bonded lap joints of steel sheets for automobiles was evaluated by tensile shear tests. The steel sheets used in this study were uncoated and galvannealed (GA) with tensile strength ranging from 270 MPa-grade to 980 MPa-grade and the thickness ranging from 0.7 to 1.8 mm. Also, the effects of the adhesive types were evaluated. The results are as follows: In the static tensile shear tests, when the steel sheets deformed during the tensile test, the tensile shear strength increased with the increase in the base metal properties, such as the yield strength and thickness; however, when the base metal properties were sufficiently high not to undergo plastic deformation, the tensile shear strength exhibited a constant value. On the other hand, the effect of base metal properties on the fatigue joint strength was relatively small. The static joint strength of the GA steel joints was slightly lower than that of the uncoated steel sheets; however, the fatigue strength of the GA steel joints was higher than that of the uncoated steel sheets. The coating failure of the GA was affected by the type of adhesive, base metal properties and type of test. Choosing the proper adhesive can reduce the failure of the GA coating, and the high strength steel showed fewer coating failures than the mild steel.
机译：通过拉伸剪切试验评估了汽车钢板钢板钢板耐腐蚀结构粘合圈接头的静态和疲劳强度。本研究中使用的钢板是未涂覆的和镀锌（Ga），其拉伸强度范围为270MPa级至980MPa级，厚度为0.7至1.8mm。而且，评估粘合剂类型的效果。结果如下：在静态拉伸剪切试验中，当钢板在拉伸试验期间变形时，拉伸剪切强度随着贱金属性质的增加而增加，例如屈服强度和厚度;然而，当基础金属性质足够高而不经历塑性变形时，拉伸剪切强度表现出恒定值。另一方面，基础金属性质对疲劳关节强度的影响相对较小。 GA钢接头的静电接头强度略低于未涂层钢板;然而，GA钢接头的疲劳强度高于未涂层钢板的疲劳强度。 GA的涂层衰竭受粘合剂，基础金属性能和试验类型的影响。选择合适的粘合剂可以降低GA涂层的故障，并且高强度钢显示出比温和钢的涂层故障较少。

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