Study on the Relationship between Crack Initiation and Crack Bifurcation in Walnut Shells Based on Energy

Xiaolan Man, Long Li, Hong Zhang (), Haipeng Lan, Xiuwen Fan, Yurong Tang and Yongcheng Zhang
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Xiaolan Man: College of Mechanical Electrification Engineering, Tarim University, Alaer 843300, China
Long Li: College of Mechanical Electrification Engineering, Tarim University, Alaer 843300, China
Hong Zhang: College of Mechanical Electrification Engineering, Tarim University, Alaer 843300, China
Haipeng Lan: College of Mechanical Electrification Engineering, Tarim University, Alaer 843300, China
Xiuwen Fan: College of Mechanical Electrification Engineering, Tarim University, Alaer 843300, China
Yurong Tang: College of Mechanical Electrification Engineering, Tarim University, Alaer 843300, China
Yongcheng Zhang: College of Mechanical Electrification Engineering, Tarim University, Alaer 843300, China

Agriculture, 2023, vol. 14, issue 1, 1-15

Abstract: Clarifying the dissipated energy required for crack expansion is an effective way to control material crushing. Therefore, based on the material fracture probability model and fractal theory, the energy range required for crack extension was determined, and the morphology of the cracks was quantified. This study investigates the influence of walnut size on crack propagation characteristics; this includes its effects on the crack initiation threshold energy, representing resistance to crack initiation, and the crack bifurcation threshold energy, representing resistance to crack bifurcation. The results show that crack extension has a well-defined threshold energy below which cracks do not initiate or bifurcate. The size of walnuts significantly impacts crack propagation characteristics, showing that both crack initiation threshold energy and crack bifurcation threshold energy decrease with increasing walnut sizes. In addition, there is a positive correlation function between the crack initiation threshold energy and the crack bifurcation threshold energy. The experimental results can offer fresh insights into material fracture prediction and serve as a reference for numerical simulations.

Keywords: walnut; crack initiation; crack bifurcation; threshold energy; fractal dimension (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2023
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