發(fā)布時間：2018-05-22 08:35

  本文選題：材料試驗機 + 復合加載��； 參考：《哈爾濱工業(yè)大學》2017年碩士論文

【摘要】：管材液壓成形是一種實現(xiàn)結構輕量化的塑性加工技術,管材屈服行為的研究有助于預測材料成形的過程,分析缺陷產生的原因,對于液壓成形工藝的改進具有指導性意義。為研究管材屈服行為,需要進行大量的管材試驗,因此開發(fā)專用試驗設備很有必要。針對適用于液壓成形的合金管材,本課題開發(fā)內外壓復合加載試驗機控制系統(tǒng),實現(xiàn)管材軸向壓力和內外壁表面壓力的同步復合加載,進行復雜三維應力狀態(tài)下的管材屈服試驗。在軸向力以及內外壓力的復合作用下,管材負載受力情況復雜,對此進行了應力和應變分析,建立管材中部位置的各向應力與外界加載量的關系和各向應變與管材形狀參數(shù)的聯(lián)系,并根據應力應變分析確定了需要采集的物理量,提出了具體的應力加載方案。加載量的控制效果直接影響管材的試驗效果,因此對試驗機控制系統(tǒng)進行了分析。首先建立了軸向推力缸和內外增壓缸的數(shù)學模型,并進行了單通道的仿真分析;然后根據加載原理搭建了多通道復合加載的試驗機系統(tǒng),通過仿真分析得到了加載量之間的影響規(guī)律。針對復合加載的影響和管材負載的特性分析了試驗機的控制策略。為消除復合加載時各加載量之間的相互影響,采用引入補償回路的方式改善了管材軸向壓力和內外壁表面壓力的控制效果。對于管材在加載過程中剛度變化的問題,設計了傳統(tǒng)PID和模糊理論結合的模糊PID控制器。根據試驗需求和系統(tǒng)硬件參數(shù),編寫試驗機控制程序,實現(xiàn)信號讀取、模式切換和數(shù)據保存。在完成系統(tǒng)單通道調試后,進行了復合加載實驗,實驗結果表明本試驗機能夠穩(wěn)定的進行復合加載,揭示了管材在內外壓加載情況下的部分變形規(guī)律。
[Abstract]:Tube hydroforming is a light weight plastic processing technology. The study of tube yield behavior is helpful to predict the process of material forming and analyze the causes of defects. It is of guiding significance for the improvement of hydroforming process. In order to study the yield behavior of pipes, a large number of pipe tests are needed, so it is necessary to develop special test equipment. Aiming at the alloy pipe which is suitable for hydroforming, the control system of internal and external pressure compound loading testing machine is developed in this paper, which realizes the synchronous composite loading of tube axial pressure and inner and outer wall surface pressure. The tube yield test under complex three-dimensional stress state was carried out. Under the combined action of axial force and internal and external pressure, the load of pipe is complicated, so the stress and strain are analyzed. The relationship between the stress in the middle position of the pipe and the external loading quantity and the relation between the strain in each direction and the shape parameters of the pipe are established. According to the stress-strain analysis, the physical quantities that need to be collected are determined, and the concrete stress loading scheme is put forward. The control effect of loading quantity directly affects the test effect of pipe, so the control system of test machine is analyzed. Firstly, the mathematical models of axial thrust cylinder and internal and external pressurized cylinder are established, and the simulation analysis of single channel is carried out, and then the multi-channel composite loading testing machine system is built according to the loading principle. Through the simulation analysis, the influence law of the loading amount is obtained. The control strategy of the testing machine is analyzed according to the influence of composite loading and the characteristics of pipe load. In order to eliminate the interaction between the loading quantities during the composite loading, the axial pressure of the pipe and the surface pressure of the inner and outer wall were improved by introducing the compensation loop. A fuzzy PID controller based on traditional PID and fuzzy theory is designed to solve the problem of stiffness change in the course of loading. According to the test requirements and system hardware parameters, the control program of the test machine is written to realize signal reading, mode switching and data saving. After the single channel debugging of the system was completed, the compound loading experiment was carried out. The experimental results show that the test machine can carry out the composite loading stably, and reveal the partial deformation law of the pipe under the condition of internal and external pressure loading.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TH87;TP273

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本文編號：1921347