沥青砂粘弹塑蠕变损伤本构模型试验研究-工程力学.PDFVIP

第 30 卷第 4 期 Vol.30 No.4 工 程 力 学 2013 年 4 月 Apr. 2013 ENGINEERING MECHANICS 249 文章编号：1000-4750(2013)04-0249-05 沥青砂粘弹塑蠕变损伤本构模型实验研究 1,2 1 1 1 曾国伟 ，杨新华 ，白 凡 ，尹安毅 (1. 华中科技大学力学系，武汉 430074 ；2. 武汉科技大学工程力学系，武汉 430065) 摘 要：针对沥青砂的非线性材料特性，结合连续损伤力学理论，对传统 Burgers 模型进行改造，提出了粘弹塑 蠕变损伤本构模型，通过对不同实验条件下沥青砂单轴蠕变试验结果的非线性拟合，获得模型参数，然后利用模 型进行预测分析，得到了不同应力水平与环境温度下的蠕变曲线和损伤演化曲线，通过比较发现该文模型能够更 合理地反映沥青砂加速蠕变的非线性特征，而且蠕变过程中损伤演化的速度受蠕变时间、应力水平与环境温度的 影响很大。 关键词：蠕变损伤；本构模型；模型参数确定；损伤演化；沥青砂 中图分类号：U416.217; O346.5 文献标志码：A doi: 10.6052/j.issn.1000-4750.2011.12.0817 EXPERIMENTAL RESEARCHES ON A VISCO-ELASTOPLASTIC CREEP DAMAGE CONSTITUTIVE MODEL OF ASPHALT MASTIC 1,2 1 1 1 ZENG Guo-wei , YANG Xin-hua , BAI Fan , YIN An-yi (1. Department of Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China; 2. Department of Mechanics Engineering, Wuhan University of Science and Technology, Wuhan 430065, China) Abstract: Considering the nonlinear characteristics of asphalt mastic and coupling continuum damage mechanics, this paper proposed a visco-elastoplastic damage constitutive model of asphalt mastic by modifying Burgers model. Based on a series of uniaxial compression creep tests which were performed under different stress levels and temperatures, a nonlinear fitting program was developed for determining model parameters. The proposed visco-elastoplastic model was used for analysis and prediction. The curves of predicted creep strain versus damage evolutional rate under different stresses and temp