Micromechanical investigation of milled and unmilled rice grains through experimental study and finite element analysis. (December 2018)

• Record Type: Journal Article
• Authors: Zabidin, Zamzuri; Omar, Farah Nadia; Hafid, Halimatun Saadiah; Md Yunos, Noor Seribainun Hidayah; Mohammed, Mohd Afandi P.; Samsu Baharuddin, Azhari; Omura, Taku; Wakisaka, Minato
• Is Part Of: Biosystems engineering. Volume 176(2018)
• Page Start: 48
• Page End: 58
• Publication Date: 2018-12
• Subjects: Rice grain -- Three point bending -- Cohesive contact -- Finite element model; Bioengineering -- Periodicals; Agricultural engineering -- Periodicals; Biological systems -- Periodicals; Génie rural -- Périodiques; Systèmes biologiques -- Périodiques; 631
• DOI: 10.1016/j.biosystemseng.2018.10.006
• Languages: English
• ISSNs: 1537-5110

Abstract

Abstract : Investigation on the effect of starch interface towards mechanical behaviour of rice grains was reported through mechanical tests (compression and three-point bending) and finite element micromechanics model. The model considered starch kernels within the rice grain (for milled rice) as well as a layer of husk on top (for unmilled rice). The interface between the kernels was modelled using cohesive zone model to simulate interfacial damage. Higher fracture stress was reported at lower moisture content from the three-point bending, and linear elastic behaviour was observed from compression tests of milled rice, which was independent of moisture contents. The force-displacement curves of milled rice are linear, whereas unmilled rice showed initial softening before hardening at approximately 0.1 mm displacement. The representative finite element models showed agreement with compression and bending experiments, suggesting significant influence of starch interface damage towards fracture of milled rice grain. Highlights: Different mechanical behaviour of unmilled and milled rice was reported. Higher fracture stress was recorded at lower moisture content from 3-point bending tests. Starch interface damage influenced fracture of rice grain from tests & modelling results.