Cohesion of fine highly cohesive powders under compression

Abstract

Understanding the transition from interparticle contact mechanics to macro-scale bulk powder cohesion remains a key challenge in powder technology. While non-cohesive materials or purely elastic systems are well-described by classic contact models, predicting the pressure-dependent cohesion (σc) of semi-crystalline organic powders under consolidation (σ1) often requires empirical fitting parameters.In this work, we develop and experimentally validate a mechanistic model for powder cohesion based on the formation of localized plastic flat spots driven by Hertzian contact mechanics and integrated into a Rumpf-type structural framework. The model explicitly accounts for non-retarded van der Waals interactions over the contact area while incorporating the elasticplastic response of surface asperities.We test this model against experimental consolidation-cohesion data for dextrose powders. The model successfully predicts the scaling behavior between consolidation stress and tensile strength, showing that the growth of the contact spot area governs the macroscopic gain in cohesion. By isolating the single-grain properties (Young's modulus, Poisson's ratio) and the surface energy of the primary crystal, we demonstrate that the mathematical structure of the Rumpf-Hertz relation is preserved, while bulk parameters like porosity and coordination number absorb the structural arrangements of the powder bed. This physical framework provides a predictive relation linking single-grain elastic-plastic properties to bulk consolidation behavior for fine organic powders.

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BibTeX RIS

BibTeX

@misc{gans2026cohesion,
  title = {{Cohesion of fine highly cohesive powders under compression}},
  author = {Adrien Gans and Thibus Metoli and Sébastien Kiesgen de Richter},
  howpublished = {HAL},
  year = {2026},
  month = oct,
  url = {https://hal.science/hal-05776806v1},
  note = {CC BY 4.0},
}

RIS

TY  - UNPB
TI  - Cohesion of fine highly cohesive powders under compression
AU  - Adrien Gans
AU  - Thibus Metoli
AU  - Sébastien Kiesgen de Richter
PY  - 2026
DA  - 2026/10/03
PB  - HAL
UR  - https://hal.science/hal-05776806v1
AB  - Understanding the transition from interparticle contact mechanics to macro-scale bulk powder cohesion remains a key challenge in powder technology. While non-cohesive materials or purely elastic systems are well-described by classic contact models, predicting the pressure-dependent cohesion (σc) of semi-crystalline organic powders under consolidation (σ1) often requires empirical fitting parameters.In this work, we develop and experimentally validate a mechanistic model for powder cohesion based on the formation of localized plastic flat spots driven by Hertzian contact mechanics and integrated into a Rumpf-type structural framework. The model explicitly accounts for non-retarded van der Waals interactions over the contact area while incorporating the elasticplastic response of surface asperities.We test this model against experimental consolidation-cohesion data for dextrose powders. The model successfully predicts the scaling behavior between consolidation stress and tensile strength, showing that the growth of the contact spot area governs the macroscopic gain in cohesion. By isolating the single-grain properties (Young's modulus, Poisson's ratio) and the surface energy of the primary crystal, we demonstrate that the mathematical structure of the Rumpf-Hertz relation is preserved, while bulk parameters like porosity and coordination number absorb the structural arrangements of the powder bed. This physical framework provides a predictive relation linking single-grain elastic-plastic properties to bulk consolidation behavior for fine organic powders.
ER  -

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