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Localized microjetting in the collapse of surface macrocavities.

K L Olney¹, P-H Chiu², D J Benson³

¹Department of Mechanical and Aerospace Engineering, University of California, San Diego, La Jolla, California, 92093.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|March 14, 2015

Summary

Copper plastic flow causes steel macrocavity collapse via a two-stage microjetting process. Microjets form from shear flow and collide, creating new jets sensitive to cavity geometry.

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Area of Science:

Materials Science
Mechanics of Materials
Solid Mechanics

Background:

Surface macrocavities can collapse under dynamic loading conditions.
Understanding microjetting phenomena is crucial for predicting material failure.
Previous studies on cavity collapse did not fully capture multiscale mechanisms.

Purpose of the Study:

To investigate the multiscale mechanism of hemicylindrical annular surface macrocavity collapse in steel.
To elucidate the role of high-strain, high-strain rate plastic flow of copper in cavity collapse.
To characterize the microjetting phenomena associated with this collapse process.

Main Methods:

Experimental investigation of cavity collapse.
Computational simulations to model plastic flow and microjet formation.
Analysis of microjet characteristics, including length and scaling with cavity radius.

Main Results:

A two-stage microjetting process was identified during cavity collapse.
Lateral microjets form from localized shear flow in copper during cavity filling.
Subsequent collision of these microjets at the cavity apex generates additional horizontal microjets.
Microjet lengths scale linearly with cavity radius and are significantly smaller than the cavity size.
The microjet development is sensitive to the specific geometry of the cavity.

Conclusions:

The collapse mechanism is distinct from previously observed jetting phenomena in other scenarios.
The findings provide new insights into the complex interplay between material flow and cavity dynamics.
This research contributes to a better understanding of material behavior under extreme conditions.