关键词: 实车热塑性弹性体（TPE）；导槽接角；密封胶条；导槽受力

Abstract: In order to analyze the reasons for the cracking of the thermo plastic elastomer (TPE) door sealing strips joint in real vehicles, the paper investigated the cracking of the door sealing strips joint through the three aspects:the joint strength of the door sealing strips itself, thermal expansion, contraction, and external force environment. In terms of the door sealing strips joint strength, the tensile test of the joint exposure and joint strength was constructed. In terms of thermal expansion and cold contraction, the high and low temperature cycle experiment of the door sealing strips joint was constructed. In terms of the external force of the door sealing strips joint, the real vehicle door sealing strips joint cutting, the cross section of the door sealing strips joint and the force analysis of the door sealing strips joint was constructed. Comprehensively analyze the root cause of the cracking of the door sealing strips joint. Combined with the experimental results of four aspects, including the angle exposure test, the joint strength test, the high and low temperature cycle test, and the external force analysis of the door sealing strips joint, the root cause of the joint cracking of the door sealing strips is the abnormal force of the door sealing strips joint, and the countermeasures and scheme verification are carried out for the root cause. Guiding directions and solutions are given for the subsequent cracking of the door sealing strips joint in real vehicles.

Key words: Thermo plastic elastomer (TPE); Door sealing strips joint; Sealing rubber strip; Door sealing strips joint stress