小麦茎秆弯曲性能的测试

Test of bending properties of wheat stalk

为能在设计小麦收获机械时提供相关参数和指导小麦优种筛选相关抗弯性能指标与评判方法提供理论依据,选择不同品种收获期小麦茎秆的不同部位为研究对象,根据三点弯曲原理,采用美国FTC公司生产的TMS-PRO型质构仪测定在不同标距、含水率和加载速率条件下小麦茎秆的弹性模量和抗弯刚度,并分析其相关变化规律。结果表明:在同一小麦品种中,茎秆中部的弹性模量和抗弯刚度均比上部大;标距、含水率和加载速率均对小麦茎秆抗弯刚度有极显著影响;标距和含水率对小麦茎秆弹性模量有极显著影响,而加载速率对其弹性模量影响不显著。

In order to provide reference for the design of harvest machinery and to obtain relevant biomechanical indexes and evaluating methods to choose more superior variety of wheat, the bending a- bility of wheat stalks under different conditions were studied. Different species of wheat stalks were cho- sen and cut at different positions. Young＇s modulus and bending rigidity under different conditions of gauge length, moisture content and loading rate were measured according to the three point bending principle on the TMS-PRO type Texture Analyzer produced by the FTC company of the U. S. and then studied. The results showed that Youngrs modulus and bending rigidity in middle part of the stalks are bigger than those of the upper parts in the same species; the bending rigidity of the wheat stalks was significantly affected by the gauge length, moisture content and loading rate, while Youngls modulus was signiiicantly affected by the gauge length and moisture contend,but not by the loading rate.