本文選題：強度 + 焊接應(yīng)力��； 參考：《集美大學(xué)》2012年碩士論文

【摘要】：裝載機前車架是連接后車架和工作裝置的重要部件，其它部件裝配在其上并與之形成一定的配合，除了承受自身重量，在作業(yè)和行走過程中還承受工作裝置傳來的力和力矩，前車架的強度、剛度都直接影響整機的使用效果。裝載機前車架主要是通過一些鋼板焊接而成的，，結(jié)構(gòu)較為復(fù)雜，載荷工況復(fù)雜多變，在使用過程中經(jīng)常發(fā)生個別位置強度不足及焊縫開裂現(xiàn)象，嚴重影響整車安全與使用壽命。 本文以某型號裝載機為研究對象，利用三維實體軟件Pro/E、動力學(xué)仿真軟件ADAMS、有限元仿真軟件Hyperworks和ANSYS完成對裝載機模型作業(yè)過程的模擬、前車架的強度分析和局部焊接應(yīng)力分析。 通過三維實體軟件Pro/E完成裝載機從車架到工作裝置的實體建模，聯(lián)合運用動力學(xué)仿真軟件ADAMS對裝載機進行動態(tài)仿真模擬，得到前車架在各工況下的載荷值。驗證了Pro/E與ADAMS聯(lián)合運用的可行性并提高了工作效率。 利用專業(yè)的網(wǎng)格劃分軟件Hyperworks中的Hypermesh模塊完成對裝載機前車架的網(wǎng)格劃分工作，縮短了網(wǎng)格劃分時間并提高網(wǎng)格劃分質(zhì)量，在ANSYS軟件中完成對各個工況下前車架的強度分析，找到了結(jié)構(gòu)薄弱部位。 根據(jù)對前車架的強度分析結(jié)果，對比工程中前車架易發(fā)生焊接開裂的地方，利用ANSYS軟件提供的生死單元技術(shù)完成局部焊接應(yīng)力分析，計算典型焊縫開口角度的焊接應(yīng)力，獲得其對應(yīng)的應(yīng)力分布及其規(guī)律。 本研究為裝載機前車架的設(shè)計提供了理論依據(jù)，對焊縫開口角度提供了指導(dǎo)意見，為動力學(xué)分析及優(yōu)化奠定了基礎(chǔ)。
[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.
【學(xué)位授予單位】：集美大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH243

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