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Prediction of Clamp loss for Sunroof Mountings under Vehicle operating conditions
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on April 06, 2021 by SAE International in United States
Event: SAE WCX Digital Summit
ABSTRACT A vehicle fitted with a sunroof has structural challenges due to the mountings of the assembly with the Body in white parts. The major challenges include water leakage, noise and durability issues. This results in warranty issues and cost penalties for the OEM. The focus of this paper is to address the challenges due to the mounting issues in the sunroof. The clinching process of the sunroof panels result in the reduction of the contact area for the clamping process. This reduction could result in bolt slippage either in the assembly of the vehicle or during the operating conditions. The sunroof module is also prone to cracks and bulging due to bolt slippage. The Virtual engineering simulation need to represent the clinching process and the variations in the surface of the body panels. In addition, the clamping of the body in white to the sunroof module has to represented for the assembly torque considering the frictional characteristics. Suitable material curves need to be used for the sunroof module. The operating conditions of the vehicle need to be considered. The effect due to road loads has to be considered in the simulation process in addition to the clinching and the clamping process. Generic and Extracted Accelerations from the Road load can be used as the input for the virtual simulation. Solutions are provided to the slippage of the bolts considering the clinching, clamping and the operating conditions. Keywords: Sunroof, Clamping, Clinching, Operating Conditions, Acceleration