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Based on the discrete element method, a multi-scale model is employed to investigate the role of contact friction in the dynamic compression responses of brittle granular materials. Four numerical granular samples with different particle friction coefficients ranging from 0.0 to 2.0 are tested and the particle breakage extent is quantified with the Einav breakage index. It is observed that the relationship...
Conventional magnetic recording has been projected to suffer from superparamagnetic instabilities at high bit densities. Heat assisted magnetic recording (HAMR) is one of the promising approaches to overcome this problem. The track where writing is taking place is heated and cooled rapidly. The lubricant is therefore required to withstand repeated temperature changes from room temperature to above...
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