首页> 外文会议>ASME International Mechanical Engineering Congress and Exposition >A MATERIAL MODEL FOR A CERAMIC POWDER BASED ON ULTRASOUND, TRS BEND BAR, AND AXISYMMETRIC TRIAXIAL COMPRESSION TEST RESULTS
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A MATERIAL MODEL FOR A CERAMIC POWDER BASED ON ULTRASOUND, TRS BEND BAR, AND AXISYMMETRIC TRIAXIAL COMPRESSION TEST RESULTS

机译:基于超声波,TRS弯曲条和轴对称三轴压缩测试结果的陶瓷粉末材料模型

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摘要

The objective of this work is to develop a material model for the compaction of a ceramic powder, suitable for use in the finite element simulation of wire forming operations using the "powder in tube" technique. The specific material investigated is a fine grained Bi{sub}2Si{sub}2CaCu{sub}2O{sub}8 (Bi-2212) powder, which is a precursor to a high temperature superconductor, and is being investigated for use in a "wind and react" coil manufacturing strategy. The powder was precompacted at a range of pressures, machined to specimen shape as needed, and tested. Properties measured included elastic moduli, bend strength, compression strength, and yield and flow response to triaxial compaction. A material model was constructed as a set of mathematical algorithms which approximated the measured material behavior. The model is isotropic, expressed in terms of the first two stress invariants, uses relative density as the internal variable, and is set so that strength, yield stress, and stiffness are zero at the pouring density. The structure in stress space is an elastic region, bounded by a friction line and a yield cap. The yield cap does not conform to associative flow or convexity, which may be attributed to some combination of granular and plastic flow.
机译:这项工作的目的是开发一种用于压实陶瓷粉末的材料模型,适用于使用“管中的粉末”技术的线形成操作的有限元模拟。研究的具体材料是一种精细的Bi {Sub} 2Si {Sub} 2Cacu {Sub} 2O {Sub} 8(Bi-2212)粉末,其是高温超导体的前体,并正在研究用于a “风和反应”线圈制造策略。将粉末预兼容在一定压力范围内,根据需要加工到样品形状和测试。测量的性质包括弹性模量,弯曲强度,压缩强度和产率和流动响应三轴压实。材料模型被构造为一组数学算法,其近似测量的材料行为。该模型是各向同性的,以前两个应力不变表示,使用相对密度作为内部变量,并且设定为使得强度,屈服应力和刚度在倾倒密度下为零。应力空间的结构是弹性区域,由摩擦线和产率盖有界线。产率盖不符合关联流动或凸起,这可能归因于粒状和塑料流动的某种组合。

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