کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1711360 1013071 2013 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Theoretical analysis and finite element simulation of a rice kernel obliquely impacted by a threshing tooth
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی کنترل و سیستم های مهندسی
پیش نمایش صفحه اول مقاله
Theoretical analysis and finite element simulation of a rice kernel obliquely impacted by a threshing tooth
چکیده انگلیسی

Impact damage is the main form of rice threshing and it is also a significant cause of rice injury. Based on contact mechanics, models of the compressed displacement and the largest pressure distribution were established for the case when the threshing tooth obliquely impacts against the rice kernel. A critical velocity formula for impact damage was developed. A computer-aided design model of a rice kernel comprising of three layered ellipsoids was established. HyperMesh software was used to partition mesh elements and to set material and contact parameters for each element, constructing a finite element model for the analysis. Using LS-DYNA software, the impact between the threshing tooth and the rice kernel was simulated and analysed. The simulation showed that the rice husk was subjected to tensile stresses. Tensile stress was a maximum at the front of the contact zone and shifted continuously. The entire kernel rolled during impact. The critical damage velocity for the kernel, corresponding to the critical von Mises stress was 29.5 m s−1, which was in agreement with experimental results.


► FEM Models were established for a threshing tooth obliquely impacting on a rice kernel.
► A critical speed formula for impact damage was provided.
► The impact process between the rice kernel and the threshing tooth was analysed by LS-DYNA.
► The critical damage velocity for the rice kernel corresponding to the critical von Mises stress was 29.5 m s−1.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biosystems Engineering - Volume 114, Issue 2, February 2013, Pages 146–156
نویسندگان
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