Authors

Abstract

During mechanized harvesting operations, including excavation, root–soil separation, collection, and transportation, cassava roots are susceptible to multiple mechanical loads such as shear, compression, and impact, which easily induce mechanical damage and seriously deteriorate the processing quality and storage performance of cassava roots. To reveal the mechanical variation characteristics and damage thresholds of cassava roots under primary mechanical damage modes during harvesting and transportation, this study took harvest-stage cassava roots as the research object and conducted systematic mechanical property tests. Three typical mechanical tests, including compression, shear, and bending tests, were performed to explore the mechanical response rules of cassava roots under typical loads, obtain key mechanical parameters and damage thresholds, and clarify the failure characteristics and mechanical mechanisms under different loading modes. The research results clarify the internal relationship between mechanical properties and mechanical damage of cassava roots at the harvesting stage. This study provides reliable basic data and theoretical support for the parameter optimization of key working components, operational parameter matching of specialized cassava harvesters, and the optimal selection of tool edge angles for cassava slicing machinery, and possesses practical engineering significance for reducing mechanical harvesting damage and improving the post-harvest commodity rate and processing performance of cassava roots.

Abstract in Chinese

木薯块根在机械化收获的挖掘、薯土分离、收集及转运作业中，易受到剪切、挤压、撞击等多种机械载荷作用而产生损伤，严重影响块根加工品质与存储期。为揭示收获与运输过程中木薯块根主要机械损伤形式下的受力变化特性及阈值，本研究以收获期木薯块根为研究对象，系统开展了力学特性试验研究。通过开展压缩、剪切、弯曲三项力学性能试验，测定收获期木薯块根在典型载荷作用下的力学响应规律，获取其关键力学参数与损伤阈值，明确不同受力形式下的破坏特征与力学机制。研究结果阐明了收获期木薯块根的力学特性与机械损伤的内在关联，为专用木薯收获机关键工作部件参数优化、作业参数匹配以及木薯切片机械刀具刃角的合理选取提供可靠的基础数据与理论支撑。在降低木薯机械化收获损伤、提升产后商品率与加工性能方面具有重要的应用价值。