Using Pseudo Variables in Probabilistic Survivability Model for Powder-Compacted Parts

Abstract

Compaction is a critical stage in the powder metallurgy process that greatly influences the mechanical properties of the finished part. To improve these properties, higher compaction pressures are employed. This makes unloading and ejection of a green compact more critical for the powder-compacted parts with relatively complicated shapes. In this paper, a survivability model concerning failure during unloading and ejection stages is developed. Considering green compact characteristics, a relationship between experimentally determined green strength, mechanical loads during ejection, and survivability of a powder-compacted part is presented. A case study is used to demonstrate the application of the model.

Keywords:

• Compaction process
• Survivability model
• Ejection stress
• Green compact
• Failure model
• Tensile failure stress