基于CAE技术的脚蹬产品力学性能优化及轻量化的研究

鉴于CAE技术能够在产品研发过程中进一步提升企业产品的设计水平和研发质量,确保产品设计的合理性并减少设计的盲目性,从而大大提高产品的可靠性和质量,此文介绍了CAE技术在脚蹬产品研发过程中发挥的重要作用。此文首先对某款脚蹬产品芯轴进行结构力学分析,发现脚蹬芯轴和定位环过盈配合非承载应力过大的问题,提出了异形结构配合的改进方案。同时在满足原有力学性能的前提下,进行了轻量化设计,并模拟了加工工艺的可行性。巨隆研发部门使用CAE技术完成了从发现问题—解决方案—制造工艺的一体化产品设计和制造流程,展示出了CAE技术在巨隆自行车脚蹬研发中所扮演的重要角色。其效果是芯轴设计时间缩短20.3%、研发成本降低32.1%,在满足工作要求的前提下,芯轴实现轻量化减重14.1%。

Ultimate bearing capacity of concrete dam involved in geometric and material nonlinearity

To get the actual ultimate bearing capacity of concrete dam, the effect of geometric nonlinearity and strain softening on it, which appears in the failure process of concrete dam, is studied. Overload method is adopted to obtain the bearing capacity of a concrete dam by taking into consideration strain softening in the material constitutive law, geometric nonlinearity in geometric equation and equilibrium differential equation. Arc-length method is used to find the extreme point and descending branch of the load-displacement curve of the dam. The results present that the effect cannot be ignored. And geometric nonlinearity of structure and strain softening of materials should be considered for numerical analysis of ultimate bearing capacity of a concrete dam.