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采用ANSYS建立三维有限元模型对半圆弯曲试验(SCB)进行数值模拟可以更好地评价沥青混合料的抗拉强度。为了明确SCB试验参数(试件厚度、切口宽度、切口深度以及支座间距)对SCB试件底部拉应力的影响程度,利用灰关联分析方法对各参数的影响程度进行定量分析,通过回归分析得到了带切口的SCB试件底部拉应力的计算公式。结果表明:对SCB试件底部拉应力影响程度依次为支座间距>切口宽度>试件厚度>切口深度;回归公式的相对误差最大值为5.13%,公式精确度较高,满足实际工程要求。
Using ANSYS to establish three-dimensional finite element model to simulate the semicircular bending test (SCB) can better evaluate the tensile strength of asphalt mixture. In order to clarify the influence degree of SCB test parameters (specimen thickness, incision width, incision depth and bearing spacing) on the tensile stress at the bottom of SCB specimen, the influence degree of each parameter by means of gray relational analysis method was quantitatively analyzed and obtained by regression analysis The formula of tensile stress at the bottom of notched SCB specimen. The results show that the influence of tensile stress on the bottom of SCB specimen is in order of bearing spacing, width of cut, thickness of specimen, and depth of cut. The maximum relative error of the regression formula is 5.13%. The formula has higher accuracy and meets the requirements of practical engineering.