摘要如今，随着轻量化，个性化需求的增加，塑料产品已经广泛的应用于生活的各 个方面。同时对塑料制品的综合性能提出了新的要求。为了满足这一要求，一般使 用性能更好的材料，另一方面是通过优化结构设计来达到要求。结构的优化，主要 是设计出最优的加强筋。塑料制件上的加强筋对塑件整体强度和刚度的影响作用， 本文主要的内容就是如何合理的设计出塑件上的加强筋。

本文利用 PROE 这款三维建模软件，建立不同截面加强筋的悬臂梁几何模型， 并利用模拟分析软件 ANSYS workbench 对所创建好的三维模型进行弯曲和扭转的分 析。明确加强筋形式、角度、截面形状对强度和刚度的影响规律。期望在满足刚 度，强度等性能的前提下，使材料更少，更轻。分析结果表明：82326

1。在弯曲的作用下，“XI”型长边开口的 60 度型加强筋的悬臂梁的强度和刚度 最好；

2。在扭矩的情况下，“X”型短边开口的 60 度型加强筋的悬臂梁的强度和刚度最 好。

利用 workbench 中的全局优化模块，再对其进一步的优化，使其达到性能最 好，用料也相对较少最优状态。

毕业论文关键词：悬臂梁；加强筋几；何模型；优化设计

Abstract Nowadays, as the increased demand for lightweight and personalization, plastic products have been widely applied to all aspects of life。 At the meantime, new requirements have been put forward for the performance of plastic products。 In order to meet the requirements, on the one hand, materials with better performance would be generally used; on the other hand, structure design would be optimized, for example, stiffener would be added into plastic products so as to improve performance。 The stiffener has some influences on the overall performance of plastic products。 Therefore, the main research direction of the paper is how to reasonably work out the stiffener of plastic products。

In the paper, PROE, the 3D modeling software, would be utilized to establish the cantilever beam geometric model with stiffener of different cross sections in the designed mathematical model。 In addition, ANSYS workbench, the simulation analysis software, would be applied to conduct the flexural and torsion analysis of the established 3D model。 On the premise of meeting the performance requirements of stiffness and intensity, it is expected that materials could be much fewer and lighter。 With the analysis of data results, the design scheme with the best performance should be elected from the designed models under different load situations。 It is shown in the analysis result that

1。Under bending the cantilever beam with 60 degree stiffener of “XI” long openings has the best performance,

2。Under torsion the cantilever beam with 60 degree stiffener of “X” short openings has the best performance。

Then, the global optimization module of workbench would be employed to further optimize it in order to achieve its optimal state with the best performance and the relatively fewer materials as well。

Key words：cantilever beam; reinforced rib; geometric model; optimization design

目 录

第一章  绪论 1

1。1  课题背景 1

1。2  常见悬臂梁的应用及设计特点 1

1。3 本课题的研究意义 3

1。4  主要研究内容 4

第二章  悬臂梁加强筋静载荷理论分析基础 5

2。1  有限元理论基础