共查询到17条相似文献,搜索用时 234 毫秒
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钛合金筒形件真空热胀形壁厚效应的数值模拟 总被引:1,自引:0,他引:1
建立了钛合金筒形件真空热胀形的二维非线性热力耦合有限元模型。使用有限元软件MSC-Marc对钛合金简形件真空热胀形过程进行数值模拟。计算了钛合金筒形件真空热胀形过程的温度场和变形场,并进行了相应的实验验证。模拟结果与实验结果吻合较好。用建立的模型对真空热胀形过程中钛合金筒形件壁厚效应进行数值模拟,讨论了一定工艺条件下钛合金筒形件壁厚与弯曲角度、胀形量和残余应力之间的关系,为实际生产中制定和优化钛合金筒形件真空热胀形工艺参数提供理论与实践依据。 相似文献
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利用MSC-Marc有限元分析软件,建立了BT20合金筒形件真空热胀形的热力耦合有限元模型。在优化模型中引用了步长自适应控制技术和两步法模拟。计算了BT20合金筒形件真空热胀形过程的温度场和变形场。结果表明:采用步长自适应控制技术和两步法模拟,有效的缩短了模拟时间,在精度变化不大的情况下,显著提高运算效率。计算结果与实验结果吻合较好。 相似文献
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建立了转子屏蔽套真空热胀形过程的二维轴对称有限元模型。借助非线性有限元软件MSC.Marc的二次开发功能,将Hastelloy C-276合金的蠕变本构模型与真空热胀形过程的有限元模型相结合,模拟了转子屏蔽套的真空热胀形过程。计算了真空热胀形过程中转子屏蔽套和模具内部的瞬时温度场和径向位移场,预测了转子屏蔽套的胀形量。研究了模具厚度、保温时间和保温温度等工艺参数对转子屏蔽套真空热胀形胀形量的影响。开展了真空热胀形工艺实验,模拟结果与实验结果吻合较好。 相似文献
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BT20钛合金筒形件的UOE热成形 总被引:1,自引:0,他引:1
阐述了用UOE热成形BT20钛合金筒形件的特点。通过对BT20筒形件UOE热成形的实验研究,确定了BT20钛合金筒形件UOE热成形工艺过程,得到了一系列成形工艺参数及在成彩过程中控制产品质量的措施。 相似文献
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Ti-15-3合金反挤成形的热力耦合数值模拟 总被引:2,自引:1,他引:2
针对新型亚稳定 β型钛合金———Ti 15 3合金 ,将物理模拟与数值模拟相结合 ,采用 3维热力耦合刚粘塑性有限元模型与 3层向后传播的人工神经网络模型相结合的方法 ,开发了一个相应的有限元数值模拟系统 ,对Ti 15 3合金筒形件的热反挤成形过程进行了数值模拟。模拟结果与试验结果吻合较好 ,说明本文的热力耦合理论分析、流变应力的神经网络预测模型以及所开发的数值模拟系统是可靠的。该模拟结果为建立Ti 15 3合金热反挤成形过程中显微组织预测模型奠定了良好的基础 相似文献
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Temperature is one of the key parameters for BT20 titanium alloy cylindrical workpiece manufactured by vacuum hot bulge forming. A two-dimensional nonlinear thermo-mechanical coupled FE model was established. Numerical simulation of vacuum hot bulge forming process of titanium alloy cylindrical workpiece was carried out using FE analysis software MSC Marc. The effects of temperature on vacuum hot bulge forming of BT20 titanium alloy cylindrical workpiece were analyzed by numerical simulation. The simulated results show that the Y-direction displacement and the equivalent plastic strain of the workpiece increase with increasing bulge temperature. The residual stress decreases with increasing bulge temperature. The optimal temperature range of BT20 titanium alloy during vacuum hot bulge forming is 750-850 ℃. The corresponding experiments were carried out. The simulated results agreed well with the experimental results. 相似文献
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Deformation behavior, temperature evolution and coupled effects have a significant influence on forming process and quality of component formed, which are very complex in forming process of aluminum alloy 7075 cross valve under multi-way loading due to the complexity of loading path and the multiplicity of associated processing parameters. A model of the process was developed under DFEORM-3D environment based on the coupled thermo-mechanical finite element method. The comparison between two process models, the conventional isothermal process model and the non-isothermal process model developed in this study, was carried out, and the results indicate that the thermal events play an important role in the aluminum alloy forming process under multi-way loading. The distributions and evolutions of the temperature field and strain filed are obtained by non-isothermal process simulation. The plastic zone and its extension in forming process of cross valve were analyzed. The results may provide guidelines for the determination of multi-way loading forming scheme and loading conditions of the forming cross valve components. 相似文献
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Numerical Simulation of Vacuum Heat Treatment Thermal Hysteresis Time of GH4169 Superalloy Workpiece 总被引:2,自引:0,他引:2
WANG Ming-wei ZHANG Li-wen JIANG Guo-dong ZHANG Fan-yun Li Chen-hui ZHANG Li-sheng ZHANG Zun-li . Department of Material Engineering Dalian University of Technology Dalian China . Shenyang Liming Aero-Engine Group Corporation Shenyang China 《材料热处理学报》2004,25(5)
GH4169is a Nickel-based superalloy,widely used inthe aero-engine.GH4169alloy workpiece usually heattreated in vacuum furnace.The advantage of vacuumheat treatment is that it prevent the surface ofworkpiece from oxidation,decarburization and getbright surface.In vacuum furnace heat transfer is dominated byradiation.Due to small heat capacity of vacuum heattreatment furnace,temperature of the furnace risesquickly to setting temperature during heating upprocess while the temperature of workpiec… 相似文献
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利用刚粘塑性有限元与动态再结晶演化热力耦合的方法,进行了7050铝合金热压缩过程变形与动态再结晶的热力耦合模拟,讨论了应变速率对7050铝合金塑性成形与动态再结晶的影响.模拟结果表明,热变形过程中,试样的各个部位的变形分布不均匀,心部的等效应变最大,变形的不均匀性随应变速率的增大而增大,但是变化的程度不大;试样内部各部位的应力大小分布不均匀,随应变速率的增大,最小应力值由自由变形的鼓形区域逐步向心部移动;动态再结晶品粒尺寸标准偏差随应变速率的增加而减小. 相似文献
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针对Nb微合金化高碳钢,建立了材料的本构关系数据库,并根据现场情况计算了热边界条件。采用热力耦合的弹塑性有限元法模拟高速线材精轧区四机架精轧过程,分析了轧制过程各道次轧件的轧制力和应力应变场、温度场的变化情况及影响因素。对于轧件温度,计算值与实测值吻合得较好。模拟结果对优化轧制工艺有参考价值。 相似文献