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首页> 外文会议>2002 World Congress on Powder Metallurgy amp; Particulate Materials Pt.9 Jun 16-21, 2002 Orlando, FI >THREE RHEOLOGICAL TESTS - HIP, UNIAXIAL PRESSING AND HOT DIE PRESSING- TO STUDY THE POWDER VISCOPLASTIC BEHAVIOR
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THREE RHEOLOGICAL TESTS - HIP, UNIAXIAL PRESSING AND HOT DIE PRESSING- TO STUDY THE POWDER VISCOPLASTIC BEHAVIOR

机译：三种流变测试-髋部，单轴压制和热模压制-研究粉末的粘塑性行为

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摘要

Models currently used to simulate the behavior of metallic powder at high temperature involve two rheological functions [Abouaf-Cassenti] determined by two tests of Uniaxial Pressing and Hot Isostatic Pressing tests. Experimental results and different results displayed in the literature show that most of all of the models do not describe the real behavior with a sufficient accuracy. So, a new experimental apparatus -Hot Die Pressing- has been designed in order to study at high temperature the powder behavior under a state of stress between isotropic stress and uniaxial compression. These three rheological tests are achieved on titanium powder at 800℃. In this paper, the experimental results are presented and shown relations between the parameters density, temperature and the state of stress and strain parameters. Finally, the comparison between the behavior of titanium powder at high temperature and their modeling -with abouaf s law- show that new constitutive equations have to be purposed.
机译：当前用于模拟金属粉末在高温下行为的模型涉及两个流变功能[Abouaf-Cassenti]，这是通过两个单轴压制和热等静压试验确定的。实验结果和文献中显示的不同结果表明，大多数模型都没有足够准确地描述真实行为。因此，为了在高温下研究在各向同性应力和单轴压缩之间的应力状态下的粉末行为，设计了一种新的实验设备-热模压。这三项流变测试是在800℃的钛粉上完成的。本文介绍了实验结果，并显示了参数密度，温度与应力和应变参数状态之间的关系。最后，将钛粉在高温下的行为与其建模（根据阿布法则）进行比较，结果表明必须采用新的本构方程。

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