An elasto-viscoplastic constitutive model incorporating pore air compressibility during powder compression process

B. Mittal, Virendra Puri

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

A new elasto-viscoplastic constitutive model (PSU-EVP) was developed for predicting a dry powder's mechanical behavior during compaction. The PSU-EVP model was developed in two stages. In the first stage, an elastoplastic model was formulated by using the fundamentals of critical state theory and key elements of the modified Cam-clay model. In the second stage, the elasto-viscoplastic model was formulated using the elastoplastic model developed in the first stage and the approach used by and given in the Adachi and Oka model. Based on these considerations, the PSU-EVP model explicitly incorporates the work done in volumetric compression of pore air during powder compaction. This aspect of the PSU-EVP model is different from the modified Cam-clay model that assumes the interparticle pore space in a powder mass to be filled with fluid. This key feature of the PSU-EVP model helps in isolating the effect of entrapped pore air on the mechanical properties of powders undergoing compression. The key parameter tbat quantifies the effect of pore air compression is known as the voids compression ratio parameter (α). The parameter a varies with pressure and can take on values between 0 and 1. A compatibility parameter (φ) was also proposed to facilitate the explicit computation of the work dissipated during compaction. Incorporation of these new concepts overcomes the major limitations of existing constitutive models. Additionally, the procedure to quantify the various parameters of the PSU-EVP constitutive model is outlined.

Original languageEnglish (US)
Pages (from-to)131-155
Number of pages25
JournalParticulate Science and Technology
Volume21
Issue number2
DOIs
StatePublished - Apr 1 2003

Fingerprint

Constitutive models
Compressibility
Powders
Compaction
Air
Cams
Clay
Mechanical properties
Fluids

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)

Cite this

@article{3dddebea2c0c43488ab31bfc3429db3f,
title = "An elasto-viscoplastic constitutive model incorporating pore air compressibility during powder compression process",
abstract = "A new elasto-viscoplastic constitutive model (PSU-EVP) was developed for predicting a dry powder's mechanical behavior during compaction. The PSU-EVP model was developed in two stages. In the first stage, an elastoplastic model was formulated by using the fundamentals of critical state theory and key elements of the modified Cam-clay model. In the second stage, the elasto-viscoplastic model was formulated using the elastoplastic model developed in the first stage and the approach used by and given in the Adachi and Oka model. Based on these considerations, the PSU-EVP model explicitly incorporates the work done in volumetric compression of pore air during powder compaction. This aspect of the PSU-EVP model is different from the modified Cam-clay model that assumes the interparticle pore space in a powder mass to be filled with fluid. This key feature of the PSU-EVP model helps in isolating the effect of entrapped pore air on the mechanical properties of powders undergoing compression. The key parameter tbat quantifies the effect of pore air compression is known as the voids compression ratio parameter (α). The parameter a varies with pressure and can take on values between 0 and 1. A compatibility parameter (φ) was also proposed to facilitate the explicit computation of the work dissipated during compaction. Incorporation of these new concepts overcomes the major limitations of existing constitutive models. Additionally, the procedure to quantify the various parameters of the PSU-EVP constitutive model is outlined.",
author = "B. Mittal and Virendra Puri",
year = "2003",
month = "4",
day = "1",
doi = "10.1080/02726350307494",
language = "English (US)",
volume = "21",
pages = "131--155",
journal = "Particulate Science and Technology",
issn = "0272-6351",
publisher = "Taylor and Francis Ltd.",
number = "2",

}

An elasto-viscoplastic constitutive model incorporating pore air compressibility during powder compression process. / Mittal, B.; Puri, Virendra.

In: Particulate Science and Technology, Vol. 21, No. 2, 01.04.2003, p. 131-155.

Research output: Contribution to journalArticle

TY - JOUR

T1 - An elasto-viscoplastic constitutive model incorporating pore air compressibility during powder compression process

AU - Mittal, B.

AU - Puri, Virendra

PY - 2003/4/1

Y1 - 2003/4/1

N2 - A new elasto-viscoplastic constitutive model (PSU-EVP) was developed for predicting a dry powder's mechanical behavior during compaction. The PSU-EVP model was developed in two stages. In the first stage, an elastoplastic model was formulated by using the fundamentals of critical state theory and key elements of the modified Cam-clay model. In the second stage, the elasto-viscoplastic model was formulated using the elastoplastic model developed in the first stage and the approach used by and given in the Adachi and Oka model. Based on these considerations, the PSU-EVP model explicitly incorporates the work done in volumetric compression of pore air during powder compaction. This aspect of the PSU-EVP model is different from the modified Cam-clay model that assumes the interparticle pore space in a powder mass to be filled with fluid. This key feature of the PSU-EVP model helps in isolating the effect of entrapped pore air on the mechanical properties of powders undergoing compression. The key parameter tbat quantifies the effect of pore air compression is known as the voids compression ratio parameter (α). The parameter a varies with pressure and can take on values between 0 and 1. A compatibility parameter (φ) was also proposed to facilitate the explicit computation of the work dissipated during compaction. Incorporation of these new concepts overcomes the major limitations of existing constitutive models. Additionally, the procedure to quantify the various parameters of the PSU-EVP constitutive model is outlined.

AB - A new elasto-viscoplastic constitutive model (PSU-EVP) was developed for predicting a dry powder's mechanical behavior during compaction. The PSU-EVP model was developed in two stages. In the first stage, an elastoplastic model was formulated by using the fundamentals of critical state theory and key elements of the modified Cam-clay model. In the second stage, the elasto-viscoplastic model was formulated using the elastoplastic model developed in the first stage and the approach used by and given in the Adachi and Oka model. Based on these considerations, the PSU-EVP model explicitly incorporates the work done in volumetric compression of pore air during powder compaction. This aspect of the PSU-EVP model is different from the modified Cam-clay model that assumes the interparticle pore space in a powder mass to be filled with fluid. This key feature of the PSU-EVP model helps in isolating the effect of entrapped pore air on the mechanical properties of powders undergoing compression. The key parameter tbat quantifies the effect of pore air compression is known as the voids compression ratio parameter (α). The parameter a varies with pressure and can take on values between 0 and 1. A compatibility parameter (φ) was also proposed to facilitate the explicit computation of the work dissipated during compaction. Incorporation of these new concepts overcomes the major limitations of existing constitutive models. Additionally, the procedure to quantify the various parameters of the PSU-EVP constitutive model is outlined.

UR - http://www.scopus.com/inward/record.url?scp=0042026309&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0042026309&partnerID=8YFLogxK

U2 - 10.1080/02726350307494

DO - 10.1080/02726350307494

M3 - Article

AN - SCOPUS:0042026309

VL - 21

SP - 131

EP - 155

JO - Particulate Science and Technology

JF - Particulate Science and Technology

SN - 0272-6351

IS - 2

ER -