Discussion Overview
The discussion centers on modeling viscoplasticity using the Perzyna model in Ansys APDL, specifically focusing on how to determine the necessary parameters for the model. Participants explore the relevance of different testing methods, such as tensile tests and creep tests, in obtaining these parameters.
Discussion Character
- Technical explanation, Experimental/applied, Debate/contested
Main Points Raised
- One participant inquires about the methods for determining parameters for the Perzyna viscoplastic model, mentioning both tensile and creep tests.
- Another participant suggests using an Instron machine for tensile strength and creep testing, noting the need for an environmental chamber for temperature control during creep tests.
- A different participant questions whether tensile tests at varying strain rates or creep tests can be used to determine the parameters.
- It is mentioned that the Instron can be programmed for different strain rates, but that strain rates influence yield and elongation, referencing ASTM methods for parameter determination.
- A participant specifies that the material being tested is HDPE and asks about conducting tests with different strain rates using a Zwick Z100 machine.
- Another participant advises consulting the operation manual of the Zwick Z100 and suggests referring to ASTM methods for guidance on setting machine parameters.
Areas of Agreement / Disagreement
Participants express varying opinions on the best methods for determining parameters, with no consensus reached on a single approach. The discussion includes multiple viewpoints on the suitability of tensile and creep tests.
Contextual Notes
Participants reference specific testing standards (ASTM methods) and equipment (Instron, Zwick Z100) but do not resolve the complexities of parameter determination or the implications of different testing conditions.
Who May Find This Useful
Researchers and engineers involved in material testing, particularly those working with viscoplastic materials and interested in modeling techniques in computational software.