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Numerical analysis of projection welding on auto-body sheet metal using a coupled finite element method 总被引:1,自引:1,他引:0
W.-F. Zhu Z.-Q. Lin X.-M. Lai A.-H. Luo 《The International Journal of Advanced Manufacturing Technology》2006,28(1-2):45-52
A comprehensive finite element method employing a subroutine to link up submodules of commercial code ANSYS is proposed to
perform analysis of projection welding in quantitative detail. In order to solve the complexity due to dynamic changes in
heat and electrical current flow paths, as well as temperature-dependent material properties, information about contact interfaces
and the geometry of the projection areas have been taken into account. By updating parameter information among these submodules
in an incremental manner, a truly thermal-electrical-mechanical coupled numerical analysis is realized for projection welding
simulation. A case study of an automotive door assembly welding process is carried out and a series of experiments is conducted
to confirm the validity of the newly developed method. The agreement between the experimental and numerical results is satisfactory,
indicating that the incrementally coupled finite element method may be suitable for projection welding research. Finally,
future work to extend this method in optimizing projection welding process design is also presented. 相似文献
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铝合金材料在轿车车身轻量化中的应用研究 总被引:5,自引:0,他引:5
减轻汽车质量、降低燃油消耗和减少排放污染成为汽车工业发展的核心问题,车身的轻量化对于整车轻量化起着举足轻重的作用,采用轻质材料是车身减重的重要途径。该文以某轿车为对象,采用铝合金材料对车身11个主要覆盖件进行轻量化研究,该方案可以使车身减重53.1Kg,减重效果达到64.5%。采用显式有限元理论建立整车有限元模型,从满足整车耐撞安全性能的角度,在整车变形、整车与刚性墙的碰撞力、运动的速度和加速度、主要零部件的吸能等方面进行分析、评价,数值仿真验证了轻量化方案的可行性。 相似文献
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金属材料在一个方向上的应变硬化降低了反方向的屈服强度,材料包辛格效应的存在对车身成形仿真精度产生了重要影响,尤其现今高强钢和铝合金的大量应用,使车身成形件的回弹问题日益突出,车身模具制造对有限元回弹预测的准确性提出更高的要求。为了提高回弹的仿真精度有必要对材料的包辛格效应进行研究,利用一套夹具对DC06和DP600两种材料的薄板进行拉伸压缩试验,获得不同预应变下的位移加载曲线,通过拉伸压缩试验结果与仿真结果的对比分析,得到能反映材料包辛格效应的非线性混合硬化模型材料参数。开展U形件成形试验,并建立试验的仿真模型,计算DC06和DP600薄板的U形件成形回弹量,分析等向强化、混合强化和随动强化本构模型对回弹预测精度的影响,针对回弹仿真结果和试验结果的差别,对影响仿真精度的材料模型因素进行分析。结果表明,DC06和DP600的包辛格效应大小存在差别,考虑包辛格效应有助于回弹仿真精度的提高,但小曲率弯曲成形回弹计算对材料本构模型的敏感性,限制了回弹仿真精度的提高。 相似文献
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Hu Cai-qi Lin Zhong-qin Lai Xin-min 《The International Journal of Advanced Manufacturing Technology》2006,30(5-6):574-577
The concept design of checking fixtures for auto-body parts is a highly complex process that requires a human designer to draw from his rich experience. By exploiting recent advances in CAD/CAM and artificial intelligence techniques, one may constrain multiple solutions such that only good designs are considered. In this paper, a method of selecting type for checking fixtures is proposed that harnesses advantages of neural networks. This method attempts to capture relevant domain knowledge and is used to produce acceptable solutions. The method is applied to a case problem and the suggested checking fixture type is compared to one offered by a human designer. The agreement between the two solutions is very close. 相似文献
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给出汽车覆盖件成形过程中处理回弹影响的NURBS曲面几何补偿算法。该算法基于NURBS曲面重构技术,依据有限元网格模型的回弹数值仿真结果对原本用NURBS曲面表达的模具型面进行反向位移补偿修整,使修整后的模具型面仍然保持NURBS曲面表达。并且这些曲面在光滑性、精度等方面都满足工程实际要求的品质。 相似文献
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基于正面耐撞性仿真的轿车车身材料轻量化研究 总被引:1,自引:0,他引:1
以某轿车为研究对象,运用显式有限元理论,建立整车有限元模型,基于“汽车正面碰撞乘员保护设计规则(CMVDR294)”的耐撞安全性仿真,从满足整车正面耐撞安全性能的角度,分别采用高强钢和铝合金对车身主要覆盖件进行轻量化研究,使车身减质量分别达9.31 kg和53.10 kg,减质量效果达到11.30%和64.50%。对整车变形、整车与刚性墙的碰撞力、运动速度和加速度、主要零部件吸能等方面进行分析、评价,数值仿真验证了轻量化方案的可行性。 相似文献
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