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为对混合料的数值化试样进行间接拉伸数值化测试,采用X-CT(X-ray Computerized Tomography)扫描混合料试件,分别计算出集料、沥青、空隙的体积组成,建立了试样的三维可视化模型;采用自行编写的程序,实现了由三维可视化模型向三维数值化模型的转化,建立了基于实际试样真实内部微细观分布的数值化试样,并对其进行间接拉伸测试模拟。引入应力集中因子指标对各种应力状态进行评价,实际应力分布结果与弹性理论解结果进行对比。结果表明:该模型能有效反映试样的三维分布状态,由于集料和空隙分布的随机性和不均匀性,实际试样的最大应力分布不再服从弹性理论解的分布状态,空隙的存在同样对混合料的力学性能起着非常重要影响。
In order to conduct indirect tensile numerical test on the digitized sample of the mixture, X-CT (X-ray Computerized Tomography) was used to scan the mixture samples to calculate the volume composition of aggregate, asphalt and voids respectively. Dimensional three-dimensional visualization model. The self-prepared program was used to realize the transformation from the three-dimensional visualization model to the three-dimensional numerical model. The numerical sample based on the real internal micro-view distribution of the actual specimen was established and indirectly stretched Test simulation. The stress concentration factor index was introduced to evaluate various stress states. The actual stress distribution results were compared with the results of elastic theory solutions. The results show that the model can effectively reflect the three-dimensional distribution of the sample. Due to the randomness and inhomogeneity of the aggregate and void distribution, the maximum stress distribution of the actual sample is no longer subject to the distribution of the elastic theory solution. The existence of voids The mechanical properties of the mixture plays a very important impact.