【作者】 崔明亮；

【导师】 郭宝峰；

【作者基本信息】 燕山大学 ， 材料加工工程， 2012， 硕士

【摘要】 疲劳破坏是工程结构和机械设备中最常见的破坏形式，液压机的主要零部件大多是在承受了多次交变载荷之后而疲劳破坏的。800MN大型模锻液压机机架采用C形板框组合预紧结构，作为压机中最主要的部件之一，机架在工作中承受着巨大的载荷。因此机架在设计时不仅要保证机架的强度和刚度，其结构疲劳特性也是保证压机是否能正常服役的关键。本文利用大型非线性有限元分析软件MSC.Marc，分析了机架在工作状态下各主要零部件的变形特点及应力分布情况，根据分析结果确定了机架可能疲劳破坏的危险点。以800MN模锻液压机主机架为原型，按照1:30的比例设计制备了试验机架，进行了静态加载试验，测试并给出了危险点的监测数据，验证了数值模拟的分析结果，为800MN模锻液压机可靠性设计提供了依据。在有限元静态分析结果的基础上利用MSC.Fatigue疲劳分析软件，结合名义应力法和Miner线性损伤累积理论对机架进行了疲劳寿命分析，给出了机架各主要构件的预测寿命，同时揭示了工作载荷、预紧力、平均应力补偿方法、存活率、缺口系数、以及加工方式和表面处理方法等因素对机架寿命的影响规律。更多还原

【Abstract】 Fatigue damage of engineering structures and mechanical equipment is the mostcommon form of destruction The damage of most main parts of hydraulic press arefatigue damage under many times of alternating load. As one of the main components of800MN large die forging hydraulic press, the frame adopts combined C shaped plate andpreloading structure and endures heavy load in the work. So when designing the frame,not only the strength and stiffness, but also the reliability should be guaranteed.Using the large nonlinear finite element analysis software MSC.Marc, thedeformation and stress distribution of the major components were analyzed in thepreloading and working state. The dangerous points in the frame were determinedaccording to the results.Taking 800MN hydraulic die forging press machine frame as the prototype, the testframe was designed according to the proportion of 1 to 30. The stress of the dangerouspoints were gained through the static loading test, verifying the results of the numericalsimulation and giving a basis for the reliability designing of 800MN hydraulic press.Based on the results of the static finite element analysis, the fatigue life of the framewas analyzed, using the fatigue analysis software MSC.Fatigue, and combining with thenominal stress method and Miner linear cumulative damage theory. The predicted lives ofthe main components were gained. The laws of the influence of the factors on the framewere revealed, such as working load, preload, average stress compensation method,survival rate, notch coefficient, processing and surface treatment method.更多还原