装载机前车架强度与局部焊接应力分析

发布时间：2018-04-12 18:48

本文选题：强度 + 焊接应力　；参考：《集美大学》2012年硕士论文

【摘要】：装载机前车架是连接后车架和工作装置的重要部件，其它部件装配在其上并与之形成一定的配合，除了承受自身重量，在作业和行走过程中还承受工作装置传来的力和力矩，前车架的强度、刚度都直接影响整机的使用效果。装载机前车架主要是通过一些钢板焊接而成的，，结构较为复杂，载荷工况复杂多变，在使用过程中经常发生个别位置强度不足及焊缝开裂现象，严重影响整车安全与使用寿命。本文以某型号装载机为研究对象，利用三维实体软件Pro/E、动力学仿真软件ADAMS、有限元仿真软件Hyperworks和ANSYS完成对装载机模型作业过程的模拟、前车架的强度分析和局部焊接应力分析。通过三维实体软件Pro/E完成装载机从车架到工作装置的实体建模，联合运用动力学仿真软件ADAMS对装载机进行动态仿真模拟，得到前车架在各工况下的载荷值。验证了Pro/E与ADAMS联合运用的可行性并提高了工作效率。利用专业的网格划分软件Hyperworks中的Hypermesh模块完成对装载机前车架的网格划分工作，缩短了网格划分时间并提高网格划分质量，在ANSYS软件中完成对各个工况下前车架的强度分析，找到了结构薄弱部位。根据对前车架的强度分析结果，对比工程中前车架易发生焊接开裂的地方，利用ANSYS软件提供的生死单元技术完成局部焊接应力分析，计算典型焊缝开口角度的焊接应力，获得其对应的应力分布及其规律。本研究为装载机前车架的设计提供了理论依据，对焊缝开口角度提供了指导意见，为动力学分析及优化奠定了基础。
[Abstract]:The front frame of the loader is an important part of connecting the rear frame and the working device. Other parts are assembled on it and cooperate with it to a certain extent. In addition to bearing their own weight, they also bear the force and torque from the working device in the course of operation and walking.The strength and stiffness of the front frame have a direct impact on the use of the whole machine.The front frame of the loader is mainly welded by some steel plates. The structure is more complex and the load condition is complex and changeable. In the process of use, the insufficient strength of individual position and the cracking of welding seam often occur, which seriously affect the safety and service life of the whole vehicle.This paper takes a certain type of loader as the research object, uses the 3D solid software Prop / E, the dynamics simulation software Adams, the finite element simulation software Hyperworks and ANSYS to complete the simulation to the loader model operation process, the front frame strength analysis and the local welding stress analysis.The 3D solid software Pro/E is used to complete the solid modeling of the loader from the frame to the working device. The dynamic simulation of the loader is carried out by using the dynamic simulation software ADAMS, and the load values of the front frame under various working conditions are obtained.The feasibility of combined use of Pro/E and ADAMS is verified and the working efficiency is improved.By using the Hypermesh module of Hyperworks, the grid division of the front frame of loader is completed, which shortens the time of grid division and improves the quality of grid division. The strength analysis of front frame under various working conditions is completed in ANSYS software.The weak part of the structure was found.According to the strength analysis results of the front frame, the welding stress analysis of typical weld opening angle is completed by using the birth and death element technique provided by ANSYS software, and the welding stress of typical weld opening angle is calculated by comparing the welding cracking place of the front frame in engineering.The corresponding stress distribution and its law are obtained.This study provides a theoretical basis for the design of the front frame of the loader, provides guidance for the weld opening angle, and lays a foundation for dynamic analysis and optimization.
【学位授予单位】：集美大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH243

【参考文献】