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ANALYSIS OF DEFORMATION BEHAVIOR AND BENDING RESISTANCE OF DRY RICE VERMICELLI BASED ON COMPRESSIVE ROD POSTBUCKLING
Author(s) -
JIANG SONG,
ZENG XINXIN,
ZHU MEIRU,
LIU JINWEI
Publication year - 2012
Publication title -
journal of texture studies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.593
H-Index - 54
eISSN - 1745-4603
pISSN - 0022-4901
DOI - 10.1111/j.1745-4603.2012.00358.x
Subject(s) - deflection (physics) , materials science , bending , composite material , structural engineering , three point flexural test , compressive strength , engineering , optics , physics
This work studied the deformation behavior and deformation parameters of dry rice vermicelli in the process of bending fracture based on the large‐deflection theory of compressive rod postbuckling. Dry rice vermicelli samples in five different lengths were investigated. Middle‐point deflection and bending angle in different axial displacements were measured using TA ‐ XT 2i T exture A nalyzer equipped with an in‐house‐built attachment. It was found that the end bending angle, the middle‐point deflection and the end axial displacement were in one‐to‐one correspondence with each other. The experimental results of middle‐point deflection and end bending angle were in good agreement with those from theoretical calculations and the errors of middle‐point deflection were below 2%. It was proposed that axial displacement instead of the middle‐point deflection or the bending angle should be used to predict bending fracture rate of straight dry rice vermicelli in different lengths as a new standard method. Practical Applications Bending fracture is an important indication to the ingredient components and processing quality of dry rice vermicelli. However, the actual determination by hand operation leaks scientificity on measuring the parameters, and the evaluation system should be more integrated and theoretical. Therefore, it is needed to theoretically demonstrate the deformation behavior of dry rice vermicelli in the process of bending fracture and to establish an instrumental method and the evaluation system to predict the bending fracture rate. The work demonstrates the deformation behavior by the large‐deflection theory of compressive rod postbuckling, clarifies the relationships between the three deformation parameters and develops a new method by measuring the axial displacement to predict the bending fracture rate. This method can be used in the quality control and quality detection stages. This study also contributes to develop a foundation of theory and method for predicting the bending resistance of slender straight food.