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Material Data for Modelling Density Distributions in Green Parts

机译：用于建模绿色零件中密度分布的材料数据

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Die compaction of powders is a process which involves filling a die with powder, compaction using rigid punches to form a dense compact and ejection from the die. The process can be treated as a large deformation plasticity problem. The challenge is to develop and implement appropriate constitutive models that capture the evolution of the powder from a loose state into a dense compact. In this paper we describe data analysis procedures and calibrate classic incremental plasticity models, such as Cam-Clay, Drucker-Prager cap models. The complexity of the models is increased from models with a hardening law to more complex constitutive models using density as state variable. The compaction behaviour of a range of powder materials is characterized experimentally. Numerical simulation of the compaction of simple parts and complex parts is demonstrated. The merits of various models are evaluated in terms of the balance between complexity and practicality. The discussion is illustrated with case studies exploring the applicability of the models specific to various powder pressing scenarios.
机译：粉末的模具压实是一种过程，包括用粉末填充模具，使用刚性冲头压实以形成致密的压块并从模具中弹出。该过程可以看作是大变形塑性问题。挑战在于开发并实施适当的本构模型，以捕获粉末从松散状态到致密坯料的演变。在本文中，我们描述了数据分析程序并校准了经典的增量可塑性模型，例如Cam-Clay，Drucker-Prager瓶盖模型。模型的复杂性从具有硬化定律的模型增加到使用密度作为状态变量的更复杂的本构模型。一系列粉末材料的压实行为通过实验表征。对简单零件和复杂零件的压实进行了数值模拟。根据复杂性和实用性之间的平衡来评估各种模型的优点。案例研究探讨了该模型对各种粉末压制场景的适用性，从而说明了这一讨论。

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