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Simulation of bending fracture test process for asphalt concrete beam based on heterogeneous state

机译：基于非均质状态的沥青混凝土梁弯曲断裂试验过程的仿真

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To analyze the crack propagation behavior of bending fracture of asphalt concrete beam, RFPA (Realistic Failure Process. Analysis) was selected to conduct a numerical simulation of bending fracture test of asphalt concrete beam specimens under the heterogeneous state. Physical tests were performed on AC-13C to simulate the process of bending fracture. Research results showed that the direction of crack extended along the stochastic distributed 'basic element,' the heterogeneity of 'basic element' only changes the direction of crack growth locally, it will not change the trend of crack propagation. Affected by the stochastic distribution of heterogeneous element, the stress distribution presents multiple peaks in specimen split process. The crack propagation gradually changed from the initial mode I-II to mode I. At the beginning of the loading procedure, tensile, compressive, and shear stresses reached the minimum at about 65 mm away from the middle of the beam. Once the distribution process completed and no element fracture happened, the tensile and shear stresses increased rapidly to 1.4-1.6 times. When element fracture occurred, the stress at the initial point of crack quickly dropped to 0. The location of fracture starting point deviated from midspan by about 3-5 mm. The crack distribution tends to discrete with the decrease of the homogeneity degree, but when the homogeneity degree is high, the crack distribution will be relatively straight and regular. The deflection analyzed under different conditions is about 1.9 mm, which is consistent with the deflection 1.7 mm tested in the laboratory. With lower tensile strength under the same homogeneous degree, the crack in specimen has multiple paths extending from the bottom to upward, as long as the tensile strength grows, the crack extends upward while only one path occurs. (C) 2017 Elsevier Ltd. All rights reserved.
机译：为了分析沥青混凝土梁弯曲断裂的裂纹扩展行为，选择了RFPA（真实破坏过程分析）对非均质状态下沥青混凝土梁试样的弯曲断裂进行了数值模拟。在AC-13C上进行了物理测试，以模拟弯曲断裂的过程。研究结果表明，裂纹的方向沿着随机分布的“基本元素”扩展，“基本元素”的异质性仅局部改变了裂纹扩展的方向，而不会改变裂纹扩展的趋势。受异质元素随机分布的影响，应力分布在试样分裂过程中呈现出多个峰值。裂纹的扩展从初始模式I-II逐渐变为模式I。在加载过程开始时，拉伸应力，压缩应力和剪切应力在距梁中心约65 mm处达到最小值。一旦分布过程完成且没有元素断裂发生，拉伸应力和剪切应力迅速增加到1.4-1.6倍。当发生元素断裂时，裂纹起始点的应力迅速降至0。断裂起点的位置偏离中跨约3-5 mm。裂纹的分布趋于随均匀度的降低而离散，但当均匀度高时，裂纹的分布会相对较直且规则。在不同条件下分析的挠度约为1.9 mm，这与实验室测试的1.7 mm一致。在相同的均匀度下具有较低的抗拉强度，试样中的裂纹具有从底部到向上延伸的多个路径，只要抗拉强度增加，裂纹就会向上延伸而仅出现一个路径。 （C）2017 Elsevier Ltd.保留所有权利。

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