Mechanism of Stiffness Loss in Synchronous Belts for Automobile

这个项目可以分为三个步骤。第一步是研究弯曲疲劳过程中螺旋帘线的弯曲刚度损失。第二步与螺旋帘线的拉伸刚度的估计相关联。最后，研究了螺旋帘线拉伸刚度损失的机理。(1)在弯曲疲劳过程中，螺旋帘线中的绞合玻璃长丝开始脱粘。作者提出了一个简化的力学模型来解释弯曲刚度损失的剥离开始。该模型合理地解释了螺旋帘线弯曲刚度的损失。(2)本文提出了一个力学模型来估计螺旋帘线的拉伸刚度。该模型合理地估计了螺旋帘线的拉伸刚度。(3)提出了一个力学模型来解释拉伸刚度损失的螺旋线考虑剥离的开始。该模型合理地解释了实验和有限元结果。拉伸刚度的损失是由纤维的弯曲变形的释放来解释的，该变形被中心芯橡胶抑制。

This project can be divided into three steps. The first step is a study on bending stiffness loss in helical cords during bending fatigue. The second step is associated with an estimation of extensional stiffness of helical cords. And in the last step, the authors study the mechanism of the extensional stiffness loss of helical cords.(1) De-bonding of stranded glass filaments in helical cords is initiated during bending fatigue. The authors proposed a simplified mechanical model to explain the bending stiffness loss by the initiation of the de-bonding. The model reasonably explained the loss of the bending stiffness in helical cords.(2) The present authors proposed a mechanical model to estimate the extensional stiffness of the helical cords. The model reasonably estimates the extensional stiffness of the helical cords.(3) A mechanical model to explain the extensional stiffness loss of the helical cords is proposed considering the initiation of the de-bonding. The model reasonably explained the experimental and FEM results. The extensional stiffness loss is explained by the release of the bending deformation of the fibers, which deformation in inhibited by the center-core rubber.