Abstract
Based on basic deformation mechanism of jointed food mass, combining loading and unloading concept of classical mechanics, we explored the practicability of classical loading and unloading criterion and proposed the principle is not suitable for deformation mechanism of jointed food mass, initially put forward the loading and unloading criterion for jointed food mass. We conducted the model test of unloading food mass. In order to reflect the jointed food mass properties, embedded-film technique is applied in model test. Food mass under unloading condition showed compression-shear failure. When the angle between jointed plane and unloading direction is 40° or 60°, the failure will be along the jointed plane. Finally, we proposed the unloading strength criterion.
Highlights
At present, unloading concept has been widely used in the field of food technology engineering, such as "unloading cracks", "excavation unloading" etc
In the previous study, loading and unloading are been discriminated according to different food technology engineering, which may cause the false concept that loading is loading and excavation is unloading and is difficult to application in the theoretical analysis and the numerical calculation
Food mass loading and unloading mechanical concepts should be starting from basic mechanics, determine the food mass loading and unloading criteria according to the study of stress and deformation mechanism of the unit body
Summary
At present, unloading concept has been widely used in the field of food technology engineering, such as "unloading cracks", "excavation unloading" etc. In the previous study, loading and unloading are been discriminated according to different food technology engineering, which may cause the false concept that loading is loading and excavation is unloading and is difficult to application in the theoretical analysis and the numerical calculation. Food mass loading and unloading mechanical concepts should be starting from basic mechanics, determine the food mass loading and unloading criteria according to the study of stress and deformation mechanism of the unit body. The mechanical properties of food mass is greatly different with mechanics properties of classic materials, it is necessary to put forward the theory of mechanics of food mass on the loading, unloading criterion. Many scholars have studied the failure criterion of food mass, many famous failure criteria were obtained including theoretical and empirical ones. Griffith failure theory can reflect the initial state of the brittle failure of food, but it cannot reflect the whole process of food failure (Griffith, 1990)
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