针对工程材料综合评价中评价指标所表达的数据信息可能有较大重叠,从而导致评价结果失真这一现象,提出了评价指标的无关度概念,以累积无关度作为候选指标取舍的定量依据.根据上述依据对五种候选铝合金挤压模具材料的13个候选评价指标进行定量筛选,并采用TOPSIS对候选材料进行综合评价.结果表明:室温弹性模量、室温断裂韧度和高温冲击功所表达的信息可以由其他10个指标体现,这3个指标删除后所得评价结果与实际结果一致,说明基于累积无关度的指标定量分析方法在工程材料评价指标定量选取中是可行的.
The data information obtained from evaluation indices of engineering materials might overlap and thus induce the distortion of evaluation resuhs.The conception of non-correlation degree of evaluation indices is put forward,and the accumulative non-correlation degree is regarded as the criterion of quantitative index selection.Thirteen candidate evaluation indices of five kinds of hot work die materials for aluminum alloy extruding processing were quantitatively analyzed according to the criterion mentioned above,and the five candidate materials were comprehensively evaluated with the technique for order preference by similarity to ideal solution (TOPSIS) according to the index system after quantitative analysis.The results show that indices of elastic modulus and fracture toughness at room temperature and impact toughness at high temperature should be taken out and the data information could be expressed by the other ten kinds of indices,and the evaluation result according to the ten indices agreed with the practical application,indicating that the quantitative analysis evaluation indices of engineering materials based on accumulative non-correlation degree is reasonable and feasible.
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