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首页> 外文会议>自動車技術会大会 >Improvement of Impact Energy Absorption by Using of High Strength Steel, Part IX - Application of the Fracture Prediction Model of Spot Weld and Base Steel to Crash Simulation of Real Full Vehicle
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Improvement of Impact Energy Absorption by Using of High Strength Steel, Part IX - Application of the Fracture Prediction Model of Spot Weld and Base Steel to Crash Simulation of Real Full Vehicle

机译：采用高强度钢的改善，采用高强度钢，部分IX - 焊接焊接骨折预测模型的应用，基础钢裂缝预测模型崩溃真实的载体模拟

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摘要

In order to examine the compatibility of improvement of crashworthiness with weight-saving of automobiles by using high strength steel, we have established the new prediction model of the fracture strength of spot welding points and base steels in automobile parts. By using of this model, we can predict exact crush mode and absorbed energy of the crashed parts with spot-weld fracture and base steel fracture. Therefore, we can simulate optimum design of the spot welding points, parts shape and applying high strength steels of the automobile parts. It was modified that our model of stress concentration between the nugget of spot weld and the specimen could be applied for respective Ultra High Strength Steel (UHSS). We had also developed new prediction model of base steel by using the stress based forming limit diagram (SFLD). We developed fracture prediction system based on these models in FEM for crash analysis. We tried to apply this system to crash simulation of the real full vehicle. It was confirmed that by using this system, maximum deformation of the vehicle body agreed with that of the experimental result. Furthermore, we could easily design the nugget diameter, the location of spot weld, parts shape and optimum steel grade to prevent from crashworthiness reduction due to fracture of spot welding points and fracture of base steels.
机译：为了通过使用高强度钢来研究改善汽车持续减轻的持续耐力的兼容性，我们已经建立了汽车零件中点焊点和底座的裂缝强度的新预测模型。通过使用该模型，我们可以预测具有点焊骨折和基础钢骨折的坠机部件的精确挤压模式和吸收能量。因此，我们可以模拟现场焊接点，零件形状和施加汽车零件的高强度钢的最佳设计。它被修改了，我们的熔渣与样品之间的应力集中模型可以应用于各自的超高强度钢（UHS）。我们还通过使用基于应力的成形限制图（SFLD）开发了新的基础钢预测模型。基于这些模型的FEM模型开发了裂缝预测系统进行崩溃分析。我们试图应用这个系统来崩溃真实的全车辆。已经证实，通过使用该系统，车身的最大变形与实验结果同意。此外，我们可以轻松地设计块直径，点焊，零件形状和最佳钢等级的位置，以防止由于点焊点的骨折和底座的骨折而导致的耐火性降低。

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