RCD模型对应力软化材料的力学行为预测分析

Effects of RCD Model on Prediction Results of Mechanical Behavior of Materials with Stress Softening

目的对具有应力峰值后软化特性的材料(混凝土、粘接接头、纤维增强沥青)进行全程应力-应变分析,重点分析相对完全扰动(RCD)模型对预测结果的影响.方法测量具有应力软化特性材料的应力-应变关系,选取"常应力"、"空隙应力"、"静水应力"和"线性应力"四个RCD模型对实测的软化材料的表观行为进行后预测.预测方法有直接法和间接法.结果各种RCD模型对具有应力软化材料力学行为预测的应力-应变曲线与实测结果是一致的,静水应力模型RCD模型能够得到更好的预测结果.结论二元扰动概念能够很好地预测软化材料的力学行为,预测应力软化材料的力学行为时,RCD模型的选取具有很大的灵活性,所提方法适用于一般的扰动材料的力学行为的后预测.

The whole process of stress-strain of the material with stress-softening after stress-peak（such as： concrete,adhesive joints,fiber reinforced asphalt） are analyzed based on Theory of Duality of Disturbance（TDD）,and the point is put on the effects of Relative Complete Disturbance models on the predicted re-sults.The observed stress-strain curve of the stress-softening material is measured,then the four RCD models,i.e.,Constant Stress,Void Stress,Hydrostatic Stress,and Linear Stress models are selected as RCD states to predict the observed stress-strain relation.The methods of prediction are direct method and indirect method.As a result,it is shown that the stress-strain curves predicted by the four RCD models are of consis-tence with the observed stress-strain curve.The result predicted by Hydrostatic Stress model is better than others.Thus,it can be seen that selection of RCD models has a great deal of flexibility,the method presented in this paper can be applied to predict mechanical behavior of a variety of disturbed material.