Material selection combined with optimal structural design for mechanical parts

To reduce the environmental impact of mechanical parts, an approach integrating structural design and material selection was studied. Adding the discrete variable of material, a hybrid optimization model was built with the aim of minimizing environmental impact and based on an ordinary structure optimization model. An optional material set was built by combining measures of qualitative and quantitative screening, while the lifecycle environmental impact of the materials was quantified using the method of Eco-indicator 99. Two groups of structurally optimal solutions were calculated with ideal and negative-ideal materials selected respectively, and then the hybrid model was simplified by comparing the solutions. A material environmental performance index was calculated using an analytic method. By comparing this index for every material in the optional material set, the optimal material can be found and the structural solutions calculated. This method was applied to a dowel bar design process as a case study. The results show that the environmental impact of each material has a significant effect on the optimal structural solution, and it is necessary to study the integration of structural design and material selection.

材料环境效能因子在绿色设计中的应用

材料选择是绿色设计中的重要内容,材料的生命周期环境影响是重要决策目标之一,基于材料的效能因子提出环境效能因子的概念,并结合空调器底板设计进行实例分析。采用生态指数方法定量化分析材料及其过程的生命周期环境影响,建立材料选择的环境效能因子分析模型。以空调器室外机组的底板设计为例说明环境效能因子分析方法的应用,分别给出刚性约束与强度约束条件下的材料最小环境影响,结果分析表明提出的方法对绿色设计中的材料选择有重要指导作用。

材料有害效能因子在家电材料选择中的应用

产品设计过程中选择绿色材料是实现绿色设计的重要方法之一,基于材料的TPI值提出了材料有害效能因子的概念,并结合洗衣机法兰轴为例进行分析。采用TPI值方法定量的评估材料对环境及人体的有害性,建立材料的有害效能因子,结合实例说明了计算方法,给出了满足扭转强度的情况下材料的最小有害性,结果表明有害效能因子的在材料选择中有重要的参考作用。