Experimental study on the static mechanical properties of a milled mixture of sugar cane

Abstract

The mechanical properties of a milled mixture of sugar cane are the basis for the establishment of a milled mixture mechanical model and the constitutive relation under different loading conditions. In this article, the static mechanical properties of the milled mixture were revealed using uniaxial confined compression, uniaxial loading‐unloading, and consolidated‐drained triaxial and direct shear tests. Axial stress is a cubic polynomial relating to the compression ratio. The Young's modulus is proportional to the loading pressure. The void ratio is exponentially related to the stress, and the compression and swelling indices are 4.273 and 0.184, respectively, in the loading‐unloading process from 0.208 to 1.389 MPa. Shear failure does not occur when the axial strain is less than or equal to 25%. Shear failure obeys the Mohr–Coulomb law, and the cohesive force and internal friction angle are 10.16 kPa and 31.5°, respectively. Other key parameters were obtained. All of these provided the basis for constructing the constitutive model of a milled mixture of sugar cane. Practical applications In this article, the prepared cane and bagasse are collectively called the milled mixture of sugar cane, which includes solid fiber, juice, and air. In the milling process, the three components in the milled mixture of sugar cane interact; the coupling of solid fiber and juice is particularly important. The mechanical properties of the milled mixture of sugar cane are the basis for the establishment of a milled mixture mechanical model and the constitutive relation under different loading conditions. In this article, the static mechanical properties of the milled mixture were revealed using uniaxial confined compression, uniaxial loading–unloading, and consolidated‐drained triaxial and direct shear tests. The key parameters were obtained. These rules and data improved the understanding of the stress–strain relationship of the milled mixture of sugar cane during the milling process and provided the basis for constructing the constitutive model of the milled mixture.

Sensitivity of important parameters in a three‐dimensional simulation of the milling process of sugar cane with modified Drucker–Prager Cap model based on evolutionary material properties

“…The loading process started with 2.275 kg of prepared cane and a speed of 0.0083 m/s (500 mm/min) until the compression ratio of the milled mixture reached 3.5. The cane variety (the 20th Gui‐tang, Nanning Sugar Company, Ltd.) and container structures for the tests were the same as those of Duan et al (). The dynamic compression tests of the milled mixture of sugar cane took 16.2 s.…”

“…Poisson's ratio can be calculated from the horizontal stress and lateral stress of the sample which are measured from uniaxial confined loading–unloading tests, Equation (5) (Duan et al, ).…”

“…reached 3.5. The cane variety (the 20th Gui-tang, Nanning Sugar Company, Ltd.) and container structures for the tests were the same as those ofDuan et al (2018). The dynamic compression tests of the milled mixture of sugar cane took 16.2 s.The results of dynamic compression tests and transient simulation tests were compared (Figure 3).…”

Elastic–plastic constitutive model of the milled mixture of sugarcane based on phase transition state

“…Schematic diagram of direct shear testing apparatus. Source : Reproduced from Reference 7 (Experimental study on the static mechanical properties of a milled mixture of sugar cane, 2018) with permission from the Wiley, copyright 2018. …”

“…The milled mixture undergoes elastic–plastic coupling during the sugarcane milling process, so its constitutive model should be able to accurately describe the elastic and plastic deformation. The elastic behavior of milled mixture could be described by isotropic elastic materials considering the elastic–plastic coupling, and elastic parameters (Poisson's ratio () and Young's modulus ()) are related to void ratio (Duan et al, 2018). Muir Wood (1992) used the critical state model to describe the mechanical behavior of saturated soil, and saturated soils exhibit elastic and plastic behavior, large strains and compressive behaviors at yield.…”