Abstract
The computational study of the fatigue life of car body components and its spot welds was carried out using two methods in this article. Besides, there analyzes the impact of spot welds failure on the stiffness characteristics of the car and a comparison of the sites of breakdown that arose during computer modeling using a digital twin with the sites of a breakdown in a real test. The study resulted in a significant influence of fatigue life on the stiffness characteristics of the car body. This noticeable effect is explained by most of the failed spot welds are located in the areas of the front and rear suspension fastenings, experiencing significant stress both during the car operation and during bench tests for bending and torsional stiffness of the body.
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