(接上期)3.5.2主方向的应力场进一步分析了有限元(FE)轮胎模型以推导出与621.3kPa(90psi)充气压力和Fz=17kN相对应的沿主方向的应力场。图18示出了负载轮胎第一、第二、第三主方向应力场冠状背面图和前视图。主方向应力场反映轮胎内的能量耗散趋势以及对轮胎疲劳寿命影响到某种程度。在优化结构设计和优化研究中常常要考虑这些应力场。由于轮胎胎体内的某一点的实际应力状态取决于相应 (Continued) 3.5.2 Stress Field in Main Direction The finite element (FE) tire model was further analyzed to derive the stress field along the main direction corresponding to an inflation pressure of 621.3 kPa (90 psi) and Fz = 17 kN. Figure 18 shows a coronal back view and a front view of the stress fields of the first, second, and third main directions of the loaded tire. The main directional stress field reflects the energy dissipation in the tire and affects the fatigue life of the tire to some extent. These stress fields are often considered in the optimization of structural design and optimization studies. The actual stress state at a certain point in the tire carcass depends on the corresponding