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National standards have clear provisions for the static load performance test of automobile door locks. The car door lock system is an important piece of equipment to protect the lives and property of members in the car. It is verified that this damper can meet working strength requirements at last. In conclusion, two feasible methods were proposed to improve the strength of rivets. By comparing the analytical results under static and dynamic load, it shows that all parts of the damper meet the strength requirements under the dynamic load, and that the maximum stress value of main parts under idle speed conditions is higher than that of running conditions, which is consistent with the actual working condition while under the static load, the rivets did not meet the strength requirement. stress of main parts of damper under static load and the stress time curve under dynamic load were obtained. Through strength analysis, the maximum equivalent. ratio between tensile and shear forces acting on the joint, ratio between bolt and plates stiffness, effect of coefficient of friction, static or fatigue loads).īased on the practical working state and load conditions of a car, the stress-strain and its strength in static and dynamic state of a new torsional vibration damper were calculated and analyzed with the finite element theory and tools, providing reliable data and a simple and accurate research method of strength for its practical application. For these reasons, this contribution tries to give a compressed, but comprehensive and clearly structured view about the maximum equivalent stress acting on the bolt as a function of the actual joint parameters (e.g.
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magnesium, aluminium and titanium), as well as design optimisations, is forcing the screw designers to perform an attentive selection of the most appropriate fastening connection. Hence, the increasing use of lightweight materials in recent years (e.g. Some Standards or Guidelines are analysed and discussed although the most complete appears the VDI-2230 (February 2003) in many cases the simplifications adopted can only be effective in presence of steel screws clamped on steel plates (often considered as rigid in comparison to the screw) and by considering coefficients of friction which vary in a narrow range (0.15–0.20). The paper deals with the assessment of the correct design methodology that allows selecting the appropriate screw (in terms of reference nominal diameter) to be used in high duty bolted joints.